F75 80 90 Inline 4 Rebuild Parts | Yamaha Outboard

Compatible Applications

OEM & Cross Reference Numbers

Matching Main Bearing Set

Pro Marine 4CYLSSMAIN Main Bearing Set

Matching Pro Marine main bearing set for Yamaha F75-F115 4-stroke rebuilds. Use this main bearing set with the correct rod bearing set when servicing the crankshaft and connecting rods.

View 4CYLSSMAIN Main Bearing Set

Required Yamaha FC-W 20W40 Engine Oil

This is not optional: Pro Marine requires Yamaha FC-W 20W40 engine oil when using these Yamaha 4-stroke bearings.

Yamaha FC-W 20W40 Engine Oil - Gallon

Required Yamaha FC-W 20W40 engine oil for use with these Pro Marine Yamaha 4-stroke rod bearings.

View Yamaha FC-W 20W40 Gallon

Yamaha FC-W 20W40 Engine Oil - Quart

Quart-size Yamaha FC-W 20W40 oil for topping off, break-in service, or ordering the exact amount needed for your rebuild.

View Yamaha FC-W 20W40 Quart

Popular Yamaha F75-F115 Rebuild Parts

Customers rebuilding Yamaha F75-F115 4-stroke powerheads often replace related piston, ring, valve, gasket, and rod bolt components during the same repair.

Vertex Standard Piston Kit

Standard-size piston kit for Yamaha F75-F115 rebuild work.

View Standard Piston Kit

Vertex .010 Oversize Piston Kit

.010 oversize piston kit for machined-cylinder rebuilds.

View .010 Oversize Piston Kit

Vertex .020 Oversize Piston Kit

.020 oversize piston kit for larger-bore rebuild applications.

View .020 Oversize Piston Kit

STD OEM Ring Kit

Standard-size OEM piston ring kit for Yamaha rebuild service.

View STD OEM Ring Kit

.010 Oversize OEM Ring Kit

OEM .25mm / .010 oversize ring kit for oversize piston rebuilds.

View .010 Oversize OEM Ring Kit

Rod Bolt

Replacement connecting rod bolt for Yamaha F75-F115 rebuild work.

View Rod Bolt

Intake Valve

Replacement intake valve, 96.9mm length and 29mm head diameter.

View Intake Valve

Intake Valve Seal

Replacement intake valve seal for Yamaha 4-stroke rebuild service.

View Intake Valve Seal

Exhaust Valve

Replacement exhaust valve, 99.3mm length and 23.9mm head diameter.

View Exhaust Valve

Exhaust Valve Seal

Replacement exhaust valve seal for Yamaha 4-stroke rebuild service.

View Exhaust Valve Seal

Valve Spring

Replacement valve spring for Yamaha F75-F115 cylinder head service.

View Valve Spring

Cylinder Head Gasket

Replacement head gasket for Yamaha F75-F115 powerhead service.

View Head Gasket

Powerhead Gasket Kit

Powerhead gasket kit for Yamaha F75-F115 rebuild and reassembly work.

View Powerhead Gasket Kit

What This Part is Used For

Rod bearings support the connecting rods on the crankshaft journals inside the Yamaha 4-stroke powerhead. During a rebuild, worn or damaged rod bearings should be replaced to help restore proper crankshaft support, oil clearance, and long-term engine reliability.

This Pro Marine rod bearing set is designed to make Yamaha F75-F100 rebuilds more straightforward by removing the need to match Yamaha bearing color codes or measure each location with Plastigauge.

Key Features and Benefits

• Pro Marine Yamaha 4-stroke rod bearing set
• Part number F75SSROD
• Designed for Yamaha F75, F90, and F100 4-stroke rebuild applications
• One-size bearing set for the listed F75-F100 application
• No Yamaha bearing color-code selection required
• No Plastigauge needed
• Matching 4CYLSSMAIN main bearing set linked above
• Must be used with Yamaha FC-W 20W40 engine oil

FAQ

What engines does this rod bearing set fit?
This set is for Yamaha F75, F90, and F100 4-stroke applications using the matching Pro Marine bearing system.

Do I need to select Yamaha bearing color codes?
No. These Pro Marine Yamaha 4-stroke bearings do not require Yamaha color-code selection.

Do I need Plastigauge?
No. Pro Marine Yamaha 4-stroke bearings do not require Plastigauge sizing.

What oil must be used with these bearings?
You must use Yamaha FC-W 20W40 engine oil. Links to the gallon and quart are included above.

Which main bearing set goes with this rod bearing set?
The matching main bearing set is 4CYLSSMAIN, linked above.

Is this the correct rod bearing set for F115?
No. For Yamaha F115 applications, use the Pro Marine 4CYLSSROD rod bearing set instead.

Should I verify fitment?
Yes. Always verify your Yamaha model, serial number, and internal engine part requirements before ordering rebuild components.

Searchable Terms

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Piston Size & Application

OEM & Cross Reference Piston Family

Yamaha Outboard Fitment

Mercury 115HP EFI Fitment

Other Piston Options

Vertex Standard Piston - 24228STD

Size: 79.00mm Standard

Standard Vertex piston for compatible cylinders that remain within factory bore-size limits.

First OEM: 68V-W1164-02-00

View Vertex Standard Piston

Vertex .010 Oversize Piston - 24228025

Size: .010 / .25mm Oversize

Intermediate oversize Vertex option for cylinders that can be finished at .010 oversize.

First OEM Reference: 60C-W1164-10-00

View Vertex .010 Piston

Wiseco Standard Piston - 3207PS

Size: 79.00mm Standard

Alternate standard-size Wiseco piston for compatible Yamaha F115 and Mercury 115 EFI engine rebuilds.

View Wiseco Standard Piston

Wiseco .020 Oversize Piston - 3207P2

Size: 79.5mm / .020 Oversize

Alternate .020 oversize Wiseco option for cylinders properly machined to the required finished bore.

View Wiseco .020 Piston

Yamaha OEM Piston Ring Options

Yamaha OEM Standard Ring Kit - 11605

Size: Standard 79mm

First OEM: 6D8-11603-00-00

OEM standard ring option for compatible standard-size 79mm pistons.

View Standard OEM Rings

Yamaha OEM .25mm Oversize Ring Kit - 11606

Size: .25mm / approximately .010 Oversize

First OEM: 6D8-11604-00-00

OEM ring option for the corresponding Yamaha .25mm oversize piston configuration.

View .25mm OEM Rings

Replacement Cylinder Sleeves

If cylinder damage cannot be corrected with a .020 overbore, replacement cylinder sleeves may be required.

Advanced Sleeve 1185SC

Straight 4-stroke cylinder sleeve for compatible engine rebuilding.

Verify sleeve dimensions, block bore and finished cylinder requirements before machining.

View 1185SC Sleeve

Advanced Sleeve 1185SA

Alternate replacement cylinder sleeve option for compatible Yamaha / Mercury four-stroke engine rebuilds.

Compare sleeve dimensions with the block before installation.

View 1185SA Sleeve

Main & Connecting Rod Bearings

Pro Marine Main Bearing Set - 4CYLSSMAIN

Complete one-size crankshaft main bearing set for compatible Yamaha four-cylinder engines.

First OEM Reference: 6D8-11416-00-00

Eliminates Yamaha bearing color-code selection and Plastigauge sizing.

View Main Bearing Set

Pro Marine F115 Rod Bearing Set - 4CYLSSROD

Complete one-size connecting rod bearing set for compatible Yamaha F115 applications.

First OEM Reference: 68V-11656-00-00

Eliminates the factory Yamaha bearing color selection process.

View Rod Bearing Set

Complete Powerhead Gasket Kit

Pro Marine Powerhead Gasket Kit - 6803

Complete gasket kit for compatible Yamaha F75-F115 powerhead rebuilds.

Recommended when the engine is disassembled for piston replacement, cylinder machining, bearing service or a complete powerhead rebuild.

OEM Families: 6D8-W0001, 67F-W0001 and 68V-W0001

View Powerhead Gasket Kit

Piston Size Guide

Shop Yamaha Engine Rebuild Parts by Model

Find additional pistons, rings, bearings, valves, gaskets, sleeves and related internal engine components in Pro Marine's Yamaha Engine Rebuild Parts by Model section.

Shop Yamaha Engine Rebuild Parts by Model

When to Use a .020 Oversize Piston

A .020 oversize piston is used when cylinder wear, scoring or damage requires enough machining that the cylinder can no longer remain at standard size or .010 oversize.

Before machining, accurately measure cylinder diameter, taper and out-of-round. The finished bore must provide the correct piston-to-wall clearance for the Vertex piston.

When Should a Cylinder be Sleeved Instead?

If cylinder damage, corrosion or previous machining prevents the bore from being restored at .020 oversize, a replacement cylinder sleeve may be required.

The replacement sleeve is installed and then finished to the correct bore for whichever piston size will be used in the rebuilt engine.

Parts to Inspect During a Powerhead Rebuild

• Cylinder bore diameter
• Cylinder taper and out-of-round
• Piston-to-wall clearance
• Piston rings and ring end gap
• Connecting rods
• Connecting rod bolts
• Connecting rod bearings
• Crankshaft main bearings
• Crankshaft journals
• Cylinder head and valves
• Valve stem seals
• Oil passages and lubrication system
• Powerhead gaskets and seals

Key Features and Benefits

• Vertex oversize piston kit
• Vertex part number 24228050
• .020 / .50mm oversize
• 79.5mm nominal piston size
• Fits extensive Yamaha F115 and LF115 applications
• Fits select Yamaha F75 and F90 applications
• Fits select Mercury 115HP EFI engines
• Vertex standard piston linked above
• Vertex .010 oversize piston linked above
• Wiseco standard and .020 piston alternatives linked above
• Yamaha OEM ring options linked above
• Replacement cylinder sleeves linked above
• Main and connecting rod bearing sets linked above
• Complete powerhead gasket kit linked above

FAQ

What size is Vertex 24228050?
It is a .020 / .50mm oversize piston, approximately 79.5mm.

Is 24228050 a standard-size piston?
No. The standard Vertex piston is the 24228STD 79.00mm piston linked above.

Can I install this piston in a standard cylinder?
No. The cylinder must be properly bored and finished for the .020 oversize piston.

Does this fit Yamaha F115?
Yes. The supplied engine fitment includes extensive Yamaha F115 and LF115 applications.

Does it fit Mercury 115 EFI?
Yes. Supplied Mercury fitment includes 0T178500 thru 0T800999, 0T801000 thru 1B226999, and 1B227000 thru 1B366822.

Do you have a .010 oversize piston?
Yes. The Vertex 24228025 is the .010 / .25mm oversize option.

Do you have another .020 piston option?
Yes. The Wiseco 3207P2 79.5mm piston is an alternate .020 oversize option.

What standard pistons are available?
Pro Marine stocks both the Vertex 24228STD and Wiseco 3207PS standard 79mm pistons.

Are replacement cylinder sleeves available?
Yes. Advanced Sleeve 1185SA and 1185SC options are linked above.

What main bearings are available?
The Pro Marine 4CYLSSMAIN main bearing set is linked above.

What connecting rod bearings are available?
The Pro Marine 4CYLSSROD connecting rod bearing set is linked above.

Is a complete powerhead gasket kit available?
Yes. The Pro Marine 6803 Powerhead Gasket Kit is linked above.

Searchable Terms

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OEM Number

Yamaha Outboard Fitment

Aftermarket Pro Marine Option

Pro Marine Intake Valve Stem Seal - A3721

Pro Marine aftermarket replacement for the compatible Yamaha OEM intake valve stem seal application.

Brand: Pro Marine
Type: Intake Valve Stem Seal

View Pro Marine Intake Valve Seal

Related Cylinder Head Rebuild Parts

Pro Marine Valve Spring - 67F-12114P

Replacement valve spring for compatible Yamaha F75-F115 four-stroke cylinder heads.

OEM: 67F-12114-00-00

View Valve Spring

Yamaha OEM Exhaust Valve Stem Seal

Genuine Yamaha OEM exhaust-side valve stem seal for compatible four-stroke cylinder heads.

Brand: Yamaha OEM

View OEM Exhaust Valve Seal

Pro Marine Exhaust Valve Stem Seal - A3722

Aftermarket exhaust valve stem seal for compatible Yamaha four-stroke engines.

Brand: Pro Marine

View Pro Marine Exhaust Seal

Pro Marine Intake Valve - 68V-12111P

Length: 96.9mm
Head Diameter: 29mm

Replacement intake valve for compatible Yamaha four-stroke cylinder-head rebuilds.

View Intake Valve

Pro Marine Exhaust Valve - 68V-12121P

Length: 99.3mm
Head Diameter: 23.9mm

Replacement exhaust valve for compatible Yamaha four-stroke cylinder-head rebuilds.

View Exhaust Valve

Valve Train Service Components

What This Part is Used For

The intake valve stem seal fits around the intake valve stem and helps control the amount of engine oil that passes between the valve stem and valve guide.

The seal must allow enough lubrication for the valve stem and guide while limiting excessive oil from entering the intake port and combustion chamber.

Symptoms of a Worn Valve Stem Seal

Valve stem seals can harden, wear or become damaged with age and heat. Excessive oil passing the seal can contribute to oil consumption and combustion-chamber deposits.

Valve seals should be inspected whenever the cylinder head is disassembled or the valves are removed.

When to Replace Valve Stem Seals

• During a complete cylinder-head rebuild
• When replacing intake or exhaust valves
• When valve guides are serviced
• If seals are hardened, cracked or damaged
• When excessive oil consumption is traced to the cylinder head
• After overheating or severe cylinder-head damage
• During a complete powerhead overhaul

Inspect These Parts During Valve Seal Replacement

• Intake valve stems
• Exhaust valve stems
• Valve guides
• Valve seats
• Valve springs
• Valve spring retainers
• Valve keepers
• Camshaft lobes
• Camshaft journals
• Cylinder-head sealing surface

Shop Yamaha Engine Rebuild Parts by Model

Pro Marine stocks pistons, piston rings, bearings, cylinder sleeves, valves, valve stem seals, gaskets and other internal Yamaha four-stroke engine components.

Shop Yamaha Engine Rebuild Parts by Model

Key Features

• Genuine Yamaha OEM intake valve stem seal
• OEM number K0A-A3721-00-00
• Fits select Yamaha F75 applications
• Fits select Yamaha F80 applications
• Fits select Yamaha F90 applications
• Fits select Yamaha F100 applications
• Fits extensive Yamaha F115 applications
• Fits Yamaha LF115 applications
• Pro Marine A3721 aftermarket option linked above
• Matching exhaust valve seals linked above
• Valve spring linked above
• Replacement intake and exhaust valves linked above

FAQ

What is the Yamaha OEM number for this intake valve seal?
The OEM number is K0A-A3721-00-00.

Is this a genuine Yamaha part?
Yes. This listing is for the Yamaha OEM intake valve stem seal.

Do you have an aftermarket version?
Yes. The Pro Marine A3721 aftermarket intake valve stem seal is linked above.

Does this fit Yamaha F115?
Yes. The supplied fitment includes extensive F115 applications from early engines through later model variants.

Does this seal fit Yamaha F75, F80, F90 and F100?
Yes. Select applications from each of those engine families are included in the verified fitment above.

Does this fit LF115 engines?
Yes. Multiple LF115 applications are included in the supplied fitment.

Do you stock the exhaust valve seal?
Yes. Both the Yamaha OEM K0A-A3722 and Pro Marine A3722 exhaust valve seals are linked above.

Do you have the valves for these engines?
Yes. The 68V-12111P intake valve and 68V-12121P exhaust valve are linked above.

Do you stock the valve spring?
Yes. The Pro Marine 67F-12114P valve spring is linked above.

Searchable Part Numbers & Terms

K0A-A3721-00-00, K0AA37210000, K0A-A3721, Yamaha intake valve seal, Yamaha intake valve stem seal, Yamaha OEM valve seal, Yamaha F75 valve seal, Yamaha F80 valve seal, Yamaha F90 valve seal, Yamaha F100 valve seal, Yamaha F115 valve seal, Yamaha LF115 valve seal, F115 intake valve seal, F115 valve stem seal, A3721, Pro Marine A3721, K0A-A3722, A3722, Yamaha exhaust valve seal, 67F-12114P, 67F-12114-00-00, Yamaha valve spring, 68V-12111P, Yamaha intake valve, 68V-12121P, Yamaha exhaust valve, Yamaha F115 cylinder head rebuild, Yamaha valve train parts, Yamaha engine rebuild parts

OEM & Cross Reference Numbers

Yamaha Outboard Fitment

Genuine Yamaha OEM Option

Yamaha OEM Exhaust Valve Stem Seal - K0A-A3722-00-00

Prefer genuine Yamaha? Pro Marine also stocks the OEM exhaust valve stem seal for the same compatible applications.

Brand: Yamaha OEM
OEM Number: K0A-A3722-00-00

View Yamaha OEM Exhaust Valve Seal

Related Cylinder Head Rebuild Parts

Pro Marine Valve Spring - 67F-12114P

Replacement valve spring for compatible Yamaha F75-F115 four-stroke cylinder heads.

OEM: 67F-12114-00-00
Mercury Cross Reference: 804131

View Valve Spring

Yamaha OEM Intake Valve Stem Seal

Matching genuine Yamaha intake-side valve stem seal for compatible four-stroke cylinder heads.

OEM: K0A-A3721-00-00

View OEM Intake Valve Seal

Pro Marine Intake Valve Stem Seal - A3721

Pro Marine aftermarket intake valve stem seal for compatible Yamaha four-stroke applications.

Replaces: K0A-A3721-00-00

View Pro Marine Intake Seal

Pro Marine Intake Valve - 68V-12111P

Length: 96.9mm
Head Diameter: 29mm

Replacement intake valve for compatible Yamaha four-stroke cylinder-head rebuilds.

View Intake Valve

Pro Marine Exhaust Valve - 68V-12121P

Length: 99.3mm
Head Diameter: 23.9mm

Replacement exhaust valve for compatible Yamaha four-stroke cylinder-head rebuilds.

View Exhaust Valve

Valve Train Service Components

What This Part is Used For

The exhaust valve stem seal fits around the exhaust valve stem and helps control oil movement between the valve stem and valve guide.

The seal allows the valve stem and guide to receive the lubrication they require while limiting excess oil from traveling through the guide and entering the exhaust port or combustion chamber.

Because exhaust-side components operate under high temperatures, the condition of the valve stem seal is especially important during a cylinder-head rebuild.

Why Exhaust Valve Stem Seals Matter

Valve stem seals are continually exposed to engine heat and repeated operating cycles. Over time, a seal may harden, crack, wear or lose its ability to properly control oil.

A deteriorated valve seal can contribute to excessive oil entering the combustion chamber, oil consumption and carbon deposits.

When to Replace Exhaust Valve Stem Seals

• During a complete cylinder-head rebuild
• When replacing an exhaust valve
• When valve guides are being serviced
• If the existing seal is hardened, cracked or damaged
• When excessive oil usage is traced to the cylinder head
• After overheating or valve-train damage
• During a complete powerhead overhaul

Inspect These Components at the Same Time

• Exhaust valve
• Intake valve
• Intake valve stem seals
• Valve guides
• Valve seats
• Valve springs
• Valve spring retainers
• Valve keepers
• Camshaft lobes and journals
• Cylinder-head sealing surface

Shop Yamaha Engine Rebuild Parts by Model

Pro Marine stocks pistons, piston rings, crankshaft main bearings, connecting rod bearings, cylinder sleeves, valves, valve stem seals, gaskets and other internal Yamaha four-stroke engine components.

Key Features

• Pro Marine aftermarket exhaust valve stem seal
• Pro Marine part number A3722
• Replaces Yamaha K0A-A3722-00-00
• Fits select Yamaha F75 applications
• Fits select Yamaha F80 applications
• Fits select Yamaha F90 applications
• Fits select Yamaha F100 applications
• Fits extensive Yamaha F115 applications
• Fits Yamaha LF115 applications
• Genuine Yamaha OEM exhaust seal available as an alternate
• OEM and Pro Marine intake valve stem seals linked above
• Valve spring linked above
• Pro Marine intake and exhaust valves linked above

FAQ

What Yamaha OEM number does Pro Marine A3722 replace?
A3722 replaces Yamaha K0A-A3722-00-00.

Is A3722 a Yamaha OEM part?
No. A3722 is the Pro Marine aftermarket version.

Can I buy the genuine Yamaha version?
Yes. The Yamaha OEM K0A-A3722-00-00 exhaust valve stem seal is linked above.

Does A3722 fit Yamaha F115?
Yes. The supplied fitment includes extensive Yamaha F115 applications from early engines through later model variants.

Does this fit Yamaha F75, F80, F90 and F100?
Yes. Select models from each of those Yamaha four-stroke families are included in the fitment above.

Does A3722 fit Yamaha LF115?
Yes. Multiple LF115 applications are included.

Do you stock the intake valve stem seal?
Yes. Pro Marine stocks both the A3721 aftermarket intake seal and Yamaha OEM K0A-A3721-00-00.

Do you stock the exhaust valve?
Yes. The Pro Marine 68V-12121P exhaust valve is linked above.

Do you stock the intake valve?
Yes. The Pro Marine 68V-12111P intake valve is linked above.

Do you stock the valve spring?
Yes. The Pro Marine 67F-12114P valve spring is linked above.

Searchable Part Numbers & Terms

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OEM Numbers & Cross References

Yamaha Outboard Fitment

Mercury Outboard Fitment

Mercury fitment below is based on the Mercury catalog applications for OEM part number 804131.

Related Cylinder Head & Valve Train Parts

When servicing the valve springs or rebuilding the cylinder head, inspect the intake and exhaust valves, valve stem seals, guides, seats and related valve-train components.

Intake Valve Stem Seals

Yamaha OEM Intake Valve Stem Seal

Genuine Yamaha OEM intake valve stem seal for compatible four-stroke cylinder heads.

Brand: Yamaha OEM

View OEM Intake Valve Seal

Pro Marine Intake Valve Stem Seal - A3721

Pro Marine aftermarket intake valve stem seal for compatible Yamaha four-stroke cylinder heads.

Brand: Pro Marine

View Pro Marine Intake Seal

Exhaust Valve Stem Seals

Yamaha OEM Exhaust Valve Stem Seal

Genuine Yamaha OEM exhaust valve stem seal for compatible Yamaha four-stroke cylinder heads.

Brand: Yamaha OEM

View OEM Exhaust Valve Seal

Pro Marine Exhaust Valve Stem Seal - A3722

Pro Marine aftermarket exhaust valve stem seal for compatible Yamaha four-stroke engines.

Brand: Pro Marine

View Pro Marine Exhaust Seal

Replacement Intake & Exhaust Valves

Pro Marine Intake Valve - 68V-12111P

Valve Length: 96.9mm
Head Diameter: 29mm

Pro Marine replacement intake valve for compatible Yamaha four-stroke cylinder-head rebuilds.

View Intake Valve

Pro Marine Exhaust Valve - 68V-12121P

Valve Length: 99.3mm
Head Diameter: 23.9mm

Pro Marine replacement exhaust valve for compatible Yamaha four-stroke cylinder-head rebuilds.

View Exhaust Valve

Related Valve Train Components

What This Part is Used For

The valve spring provides the closing force for the intake or exhaust valve after the camshaft opens the valve.

Proper valve spring pressure helps the valve follow the camshaft profile, return to the closed position and remain seated when combustion pressure is present.

Weak, damaged or incorrectly installed valve springs can contribute to poor valve control, loss of compression or abnormal valve-train operation.

When to Inspect or Replace Valve Springs

• During a complete cylinder-head rebuild
• After valve or piston contact
• When replacing damaged intake or exhaust valves
• If a spring is visibly damaged, corroded or distorted
• If spring free length or pressure is outside service specifications
• During a major powerhead overhaul

Inspect These Parts During Cylinder Head Service

• Intake valves
• Exhaust valves
• Valve stem seals
• Valve guides
• Valve seats
• Valve springs
• Spring retainers
• Valve keepers
• Camshaft lobes and journals
• Cylinder-head sealing surface

Shop Yamaha Engine Rebuild Parts by Model

Pro Marine stocks pistons, rings, main bearings, rod bearings, cylinder sleeves, valves, valve seals, gaskets and other internal Yamaha four-stroke engine components.

Shop Yamaha Engine Rebuild Parts by Model

Key Features

• Pro Marine aftermarket valve spring
• Part number 67F-12114P
• Replaces Yamaha 67F-12114-00-00
• Cross references Mercury 804131
• Fits select Yamaha F75 applications
• Fits select Yamaha F80 applications
• Fits select Yamaha F90 applications
• Fits select Yamaha F100 applications
• Fits extensive Yamaha F115 and LF115 applications
• Fits select Mercury 75HP and 90HP carbureted engines
• Fits select Mercury 75-115HP EFI engines
• OEM Yamaha valve seals available
• Pro Marine aftermarket valve seals available
• Pro Marine intake and exhaust valves available

FAQ

What Yamaha number does 67F-12114P replace?
It replaces Yamaha OEM 67F-12114-00-00.

What Mercury number does this valve spring replace?
It cross references Mercury 804131.

Does 67F-12114P fit Yamaha F115?
Yes. The supplied fitment includes numerous Yamaha F115 and LF115 applications from early engines through later model families.

Does this fit Yamaha F75, F80, F90 or F100?
Yes. Select applications for each of those horsepower families are included in the verified fitment above.

Does this valve spring fit Mercury 115 EFI?
Yes. Mercury catalog fitment includes 0T178500 thru 0T800999, 0T801000 thru 1B226999, and 1B227000 thru 1B366822.

What other Mercury engines use this spring?
Catalog fitment also includes select Mercury 75HP and 90HP carbureted engines and 75HP, 80HP, 90HP and 100HP EFI applications.

Do you stock intake and exhaust valves?
Yes. Pro Marine 68V-12111P intake and 68V-12121P exhaust valves are linked above.

Do you stock Yamaha OEM valve stem seals?
Yes. Yamaha OEM intake and exhaust valve stem seals are linked above.

Are aftermarket valve stem seals available?
Yes. Pro Marine A3721 intake and A3722 exhaust valve stem seals are linked above.

Searchable Part Numbers & Terms

67F-12114P, 67F-12114-00-00, 67F121140000, 804131, Mercury 804131, Yamaha valve spring, Yamaha F75 valve spring, Yamaha F80 valve spring, Yamaha F90 valve spring, Yamaha F100 valve spring, Yamaha F115 valve spring, Yamaha LF115 valve spring, Mercury 75 valve spring, Mercury 80 valve spring, Mercury 90 valve spring, Mercury 100 valve spring, Mercury 115 valve spring, Mercury 115 EFI valve spring, 68V-12111P, Yamaha intake valve, 68V-12121P, Yamaha exhaust valve, K0A-A3721, A3721, Yamaha intake valve stem seal, K0A-A3722, A3722, Yamaha exhaust valve stem seal, Yamaha cylinder head rebuild, Yamaha F115 cylinder head parts, Yamaha engine rebuild parts

OEM & Cross Reference Numbers

Yamaha Outboard Fitment

.020 Oversize Wiseco Piston Option

Wiseco .020 Oversize Piston Kit - 79.5mm - 3208P2

Oversize Wiseco piston for compatible Yamaha F75, F80, F90 and F100 rebuilds where the cylinder has been machined to 79.5mm / .020 oversize.

OEM References: 6D8-W1164-00-00, 6D8-W1164-30-00, 6D8-W1164-31-00, 67F-11640-00-00

View .020 Oversize Wiseco Piston

Replacement Cylinder Sleeves

If a cylinder is damaged beyond a normal overbore repair, Pro Marine also stocks replacement Advanced Sleeve options for this Yamaha four-stroke engine family.

Advanced Sleeve 1185SC - Straight 4-Stroke Sleeve

Replacement cylinder sleeve for compatible Yamaha four-stroke rebuilds. Pro Marine lists this sleeve with a 3.118" standard bore, 3.310" OD and 5.195" length. :contentReference[oaicite:1]{index=1}

View 1185SC Cylinder Sleeve

Advanced Sleeve 1185SA - Straight 4-Stroke Sleeve

Alternate Advanced Sleeve option. Pro Marine lists this sleeve with a 3.118" bore, 3.270" OD and 5.195" length. :contentReference[oaicite:2]{index=2}

View 1185SA Cylinder Sleeve

Crankshaft & Connecting Rod Bearings

Rebuilding the complete powerhead? Pro Marine stocks one-size main and rod bearing sets for this Yamaha engine family. These bearing sets eliminate Yamaha color-code selection and Plastigauge sizing. :contentReference[oaicite:3]{index=3}

Pro Marine F75-F115 Main Bearing Set - 4CYLSSMAIN

Complete crankshaft main bearing set for compatible Yamaha F75-F115 four-stroke engines.

First OEM Reference: 6D8-11416-00-00

One-size bearing system with no Yamaha color-code selection or Plastigauge sizing required. :contentReference[oaicite:4]{index=4}

View Main Bearing Set

Pro Marine F75-F100 Connecting Rod Bearing Set - F75SSROD

Matching one-size connecting rod bearing set for compatible Yamaha F75, F90 and F100 four-stroke applications.

Designed to eliminate Yamaha color-code selection and Plastigauge bearing sizing. :contentReference[oaicite:5]{index=5}

View Connecting Rod Bearing Set

Complete Powerhead Gasket Kit

Pro Marine Powerhead Gasket Kit - 6803

Complete powerhead gasket kit for compatible Yamaha F75-F115 engine rebuilds.

Recommended when the engine is being fully disassembled for pistons, bearings, cylinder repair or other major internal work.

OEM Families: 6D8-W0001, 67F-W0001 and 68V-W0001

View Powerhead Gasket Kit

Shop Yamaha Engine Rebuild Parts by Model

Need the rest of the components for your rebuild? Use our Yamaha Engine Rebuild Parts by Model section to find pistons, rings, bearings, valves, gaskets, sleeves and related internal engine parts.

What is Included

This listing is for the Wiseco 3208PS standard-size piston kit. Confirm the exact kit contents shown on the product listing before ordering any additional rings, pins, clips or related components separately.

What This Piston is Used For

The piston transfers combustion force through the connecting rod to the crankshaft. It must maintain the correct clearance within the cylinder bore while supporting the piston rings that seal combustion pressure and control engine oil.

During a powerhead rebuild, piston selection should be based on the actual finished cylinder-bore measurement rather than simply replacing the original piston with the same nominal size.

Standard Piston or Oversize Piston?

Parts to Inspect During a Piston Replacement

• Cylinder bore condition and finished bore size
• Piston rings
• Connecting rod bearings
• Connecting rod bolts
• Crankshaft journals
• Crankshaft main bearings
• Cylinder head and valves
• Valve stem seals
• Oil passages and lubrication system
• Powerhead gaskets and seals

Key Features and Benefits

• Wiseco standard-size piston kit
• Wiseco item 3208PS
• 79.00mm standard bore size
• Fits select Yamaha F75 four-stroke engines
• Fits select Yamaha F80 four-stroke engines
• Fits select Yamaha F90 four-stroke engines
• Fits select Yamaha F100 four-stroke engines
• Replaces Yamaha 6D8-W1164-00-00
• Replaces Yamaha 6D8-W1164-30-00
• Replaces Yamaha 6D8-W1164-31-00
• Replaces Yamaha 67F-11640-00-00
• .020 / 79.5mm Wiseco piston option linked above
• Replacement cylinder sleeves linked above
• Matching main and connecting rod bearings linked above
• Complete powerhead gasket kit linked above

FAQ

What size is the Wiseco 3208PS piston?
It is the standard-size 79.00mm piston.

What Yamaha OEM numbers does 3208PS replace?
It cross references 6D8-W1164-00-00, 6D8-W1164-30-00, 6D8-W1164-31-00 and 67F-11640-00-00.

Does this fit Yamaha F75?
Yes. Verified applications include the 2005 F75TLRD and later F75LA / F75TLR applications listed above.

Does it fit Yamaha F90?
Yes. The supplied fitment includes 2005 F90TJR / TLR / TXR engines and numerous later F90JA, LA, TJR, TLR, TXR and XA applications.

Does this fit Yamaha F80?
Yes. Verified F80 applications are primarily within the 1999-2003 engine families listed above.

Does it fit Yamaha F100?
Yes. Verified F100 TLR and TXR applications span 1999-2003.

Do you have an oversize piston?
Yes. The Wiseco 3208P2 .020 oversize / 79.5mm piston is linked above.

Do you have replacement cylinder sleeves?
Yes. Advanced Sleeve 1185SA and 1185SC options are linked above for compatible rebuild applications.

What main bearing set goes with this engine?
The Pro Marine 4CYLSSMAIN main bearing set is linked above for compatible Yamaha four-cylinder engines.

What connecting rod bearings go with this piston?
For compatible F75, F80, F90 and F100 applications, use the Pro Marine F75SSROD connecting rod bearing set linked above.

Is a complete gasket kit available?
Yes. The Pro Marine 6803 powerhead gasket kit is linked above.

Searchable Terms

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Part Number & Size

OEM Piston Family

The corresponding standard-size piston family cross references the following Yamaha OEM piston assemblies:

Yamaha Outboard Fitment

Standard 79mm Wiseco Piston Option

If the cylinder remains within standard-size service limits, use the standard 79.00mm Wiseco 3208PS piston instead.

Wiseco Standard Piston Kit - 79.00mm - 3208PS

Standard-size piston for compatible Yamaha F75, F80, F90 and F100 four-stroke engines where the cylinder remains suitable for a 79.00mm standard bore.

OEM References: 6D8-W1164-00-00, 6D8-W1164-30-00, 6D8-W1164-31-00, 67F-11640-00-00

View Standard 79mm Wiseco Piston

Replacement Cylinder Sleeves

If cylinder damage is too severe for a normal .020 overbore repair, replacement sleeves may be required during the rebuild.

Advanced Sleeve 1185SC - Straight 4-Stroke Sleeve

Replacement cylinder sleeve option for compatible Yamaha four-stroke powerhead rebuilds.

Verify sleeve outside diameter, length and finished-bore requirements before machining or installation.

View 1185SC Cylinder Sleeve

Advanced Sleeve 1185SA - Straight 4-Stroke Sleeve

Alternate replacement cylinder sleeve option for compatible Yamaha four-stroke engine rebuilding.

Compare sleeve dimensions to the block and machining requirements before ordering.

View 1185SA Cylinder Sleeve

Crankshaft & Connecting Rod Bearings

A piston replacement is often part of a larger powerhead rebuild. Pro Marine stocks matching one-size crankshaft main and connecting rod bearing sets for compatible Yamaha four-cylinder engines.

Pro Marine Yamaha Main Bearing Set - 4CYLSSMAIN

Complete one-size crankshaft main bearing set for compatible Yamaha four-cylinder four-stroke applications.

First OEM Reference: 6D8-11416-00-00

Eliminates Yamaha bearing color-code selection and Plastigauge sizing.

View Main Bearing Set

Pro Marine F75-F100 Rod Bearing Set - F75SSROD

Matching one-size connecting rod bearing set for compatible Yamaha F75, F80, F90 and F100 four-stroke engines.

Designed to simplify bearing selection by eliminating the factory color-code sizing system.

View Connecting Rod Bearing Set

Complete Powerhead Gasket Kit

Pro Marine Powerhead Gasket Kit - 6803

Complete powerhead gasket kit for compatible Yamaha F75-F115 engine rebuilds.

Recommended when the engine is being disassembled for piston replacement, cylinder machining, bearing service or a complete rebuild.

OEM Families: 6D8-W0001, 67F-W0001 and 68V-W0001

View Powerhead Gasket Kit

Shop Yamaha Engine Rebuild Parts by Model

Use Pro Marine's Yamaha engine rebuild sections to find related pistons, bearings, valves, gaskets, sleeves and other internal engine components.

Standard vs. .020 Oversize Piston

Parts to Inspect During an Oversize Piston Rebuild

• Cylinder bore diameter and taper
• Cylinder roundness
• Finished piston-to-wall clearance
• Piston rings and ring end gap
• Connecting rod bearings
• Connecting rod bolts
• Crankshaft journals
• Crankshaft main bearings
• Cylinder head and valves
• Powerhead gaskets and seals
• Oil passages and lubrication system

Key Features and Benefits

• Wiseco oversize Yamaha piston kit
• Wiseco item 3208P2
• .020 oversize
• 79.5mm piston diameter
• Fits select Yamaha F75 engines
• Fits select Yamaha F80 engines
• Fits select Yamaha F90 engines
• Fits select Yamaha F100 engines
• Standard 79mm Wiseco piston linked above
• Replacement cylinder sleeves linked above
• Matching crankshaft main bearings linked above
• Matching connecting rod bearings linked above
• Complete powerhead gasket kit linked above

FAQ

What size is Wiseco 3208P2?
It is a 79.5mm / .020 oversize piston.

Is this the standard-size piston?
No. The standard-size piston is the Wiseco 3208PS 79.00mm piston linked above.

Does 3208P2 fit Yamaha F75?
Yes, for compatible F75 applications where the cylinder is properly machined for the 79.5mm oversize piston.

Does it fit Yamaha F90?
Yes. The supplied engine fitment includes numerous F90 applications, but the cylinder must be machined for the oversize piston.

Does it fit Yamaha F80 and F100?
Yes. Verified engine families include select F80 and F100 applications primarily from 1999 through 2003.

Can I put this piston in a standard bore?
No. This piston is .020 oversize and requires the cylinder to be correctly bored and finished for a 79.5mm piston.

Do you stock the standard-size piston?
Yes. The Wiseco 3208PS 79.00mm standard piston is linked above.

Do you have cylinder sleeves?
Yes. Advanced Sleeve 1185SA and 1185SC options are linked above.

What main bearings are available for this engine?
The Pro Marine 4CYLSSMAIN crankshaft main bearing set is linked above for compatible applications.

What rod bearings are available?
The Pro Marine F75SSROD connecting rod bearing set is linked above.

Is a complete gasket kit available?
Yes. The Pro Marine 6803 Powerhead Gasket Kit is linked above for compatible engine rebuilds.

Searchable Terms

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OEM Number

Yamaha Outboard Fitment

What This Part is Used For

The connecting rod bolt secures the connecting rod cap to the connecting rod around the crankshaft journal.

This fastener is subjected to repeated tensile and cyclic loading as the piston and connecting rod accelerate and decelerate during engine operation. Correct bolt condition and installation are critical during a powerhead rebuild.

When Should a Rod Bolt Be Replaced?

Connecting rod bolts should be inspected whenever the connecting rod is removed during engine disassembly.

Follow the Yamaha service manual for the exact model for reuse criteria, tightening sequence and torque procedure. If Yamaha specifies replacement after removal, install a new bolt rather than reusing the original fastener.

Inspect During Connecting Rod Service

• Connecting rod big-end bore
• Connecting rod cap mating surfaces
• Connecting rod bearing condition
• Crankshaft rod journal condition
• Rod bolt threads
• Rod bolt seating surfaces
• Piston pin and small-end bore
• Piston condition

Powerhead Rebuild Installation Notes

Internal engine fasteners should always be installed according to the Yamaha service procedure for the exact engine being rebuilt.

Keep each connecting rod cap matched to its original connecting rod and orientation, and verify crankshaft journal and bearing clearances before final assembly.

Do not substitute another Yamaha rod bolt simply because it appears physically similar.

Shop Yamaha Engine Rebuild Parts by Model

Pro Marine stocks pistons, rings, connecting rod bearings, crankshaft bearings, rod bolts, cylinder sleeves, valves, gaskets and other internal Yamaha four-stroke engine components.

Key Features

• Genuine Yamaha OEM connecting rod bolt
• OEM number 67F-11654-00-00
• Fits select Yamaha F75 applications
• Fits select Yamaha F80 applications
• Fits select Yamaha F90 applications
• Fits select Yamaha F100 applications
• Verified fitment spans 1999-2005 model applications
• Used to secure the connecting rod cap to the connecting rod
• Designed for internal Yamaha four-stroke powerhead service

FAQ

What is the OEM number for this Yamaha rod bolt?
The OEM number is 67F-11654-00-00.

Is this a genuine Yamaha part?
Yes. This listing is for a genuine Yamaha OEM connecting rod bolt.

Does 67F-11654-00-00 fit Yamaha F75?
Yes. Verified applications include F75TLRB, F75TLRC and F75TLRD models from 2003-2005.

Does it fit Yamaha F80?
Yes. Select F80 applications from 1999 through 2003 are included in the verified fitment.

Does it fit Yamaha F90?
Yes. Verified applications include select F90 models from 2003 through 2005.

Does it fit Yamaha F100?
Yes. Verified F100 applications range from 1999 through 2003.

Can I reuse my original connecting rod bolt?
Follow the Yamaha service manual for the exact engine. If Yamaha specifies replacement after removal, or if the bolt is damaged or questionable, install a new OEM bolt.

Should I verify my full Yamaha model number?
Yes. Yamaha used different rod bolts across similar horsepower engines, so the complete model designation should be verified before ordering.

Searchable Part Numbers & Terms

67F-11654-00-00, 67F116540000, Yamaha 67F-11654, Yamaha rod bolt, Yamaha connecting rod bolt, Yamaha F75 rod bolt, Yamaha F80 rod bolt, Yamaha F90 rod bolt, Yamaha F100 rod bolt, F75 connecting rod bolt, F80 connecting rod bolt, F90 connecting rod bolt, F100 connecting rod bolt, Yamaha four stroke rod bolt, Yamaha powerhead rod bolt, Yamaha connecting rod fastener, Yamaha engine rebuild parts, Yamaha powerhead rebuild parts

OEM & Cross Reference Numbers

Yamaha Outboard Fitment

Genuine Yamaha OEM Option

Yamaha OEM Intake Valve Stem Seal - K0A-A3721-00-00

Prefer genuine Yamaha? Pro Marine also stocks the OEM intake valve stem seal for the same compatible applications.

Brand: Yamaha OEM
OEM Number: K0A-A3721-00-00

View Yamaha OEM Intake Valve Seal

Related Cylinder Head Rebuild Parts

Pro Marine Valve Spring - 67F-12114P

Replacement valve spring for compatible Yamaha F75-F115 four-stroke cylinder heads.

OEM: 67F-12114-00-00

View Valve Spring

Yamaha OEM Exhaust Valve Stem Seal

Genuine Yamaha OEM exhaust-side valve stem seal for compatible four-stroke cylinder heads.

Brand: Yamaha OEM

View OEM Exhaust Valve Seal

Pro Marine Exhaust Valve Stem Seal - A3722

Aftermarket exhaust valve stem seal for compatible Yamaha four-stroke engines.

Brand: Pro Marine

View Pro Marine Exhaust Seal

Pro Marine Intake Valve - 68V-12111P

Length: 96.9mm
Head Diameter: 29mm

Replacement intake valve for compatible Yamaha four-stroke cylinder-head rebuilds.

View Intake Valve

Pro Marine Exhaust Valve - 68V-12121P

Length: 99.3mm
Head Diameter: 23.9mm

Replacement exhaust valve for compatible Yamaha four-stroke cylinder-head rebuilds.

View Exhaust Valve

Valve Train Service Components

What This Part is Used For

The intake valve stem seal fits around the intake valve stem and helps regulate the amount of engine oil that passes between the valve stem and valve guide.

The valve guide requires lubrication, but excessive oil entering past the guide can reach the intake port and combustion chamber. The valve stem seal helps control this oil flow while allowing the valve to move normally.

Why Intake Valve Stem Seals Matter

Valve stem seals operate in a high-temperature environment and can become hardened, worn or damaged over time. A deteriorated seal may allow excess oil into the combustion chamber.

During a cylinder-head rebuild, replacing valve stem seals while the valves are already removed can prevent having to disassemble the valve train again later.

When to Replace Valve Stem Seals

• During a complete cylinder-head rebuild
• When replacing intake or exhaust valves
• When servicing valve guides
• If seals are hardened, cracked, flattened or damaged
• When excessive oil usage is traced to the cylinder head
• After overheating or cylinder-head damage
• During a complete powerhead overhaul

Inspect These Components at the Same Time

• Intake valves
• Exhaust valves
• Exhaust valve stem seals
• Valve guides
• Valve seats
• Valve springs
• Spring retainers and keepers
• Camshaft lobes and journals
• Cylinder-head sealing surfaces

Shop Yamaha Engine Rebuild Parts by Model

Pro Marine stocks pistons, piston rings, main bearings, rod bearings, cylinder sleeves, valves, valve seals, gaskets and other internal Yamaha four-stroke engine components.

Shop Yamaha Engine Rebuild Parts by Model

Key Features

• Pro Marine aftermarket intake valve stem seal
• Pro Marine part number A3721
• Replaces Yamaha K0A-A3721-00-00
• Fits select Yamaha F75 four-stroke applications
• Fits select Yamaha F80 four-stroke applications
• Fits select Yamaha F90 four-stroke applications
• Fits select Yamaha F100 four-stroke applications
• Fits extensive Yamaha F115 applications
• Fits Yamaha LF115 applications
• Genuine Yamaha OEM intake seal available as an alternative
• OEM and Pro Marine exhaust valve seals linked above
• Valve spring linked above
• Pro Marine intake and exhaust valves linked above

FAQ

What Yamaha OEM number does Pro Marine A3721 replace?
A3721 replaces Yamaha K0A-A3721-00-00.

Is A3721 a Yamaha OEM part?
No. A3721 is the Pro Marine aftermarket version.

Can I buy the Yamaha OEM version instead?
Yes. The genuine Yamaha K0A-A3721-00-00 intake valve stem seal is linked above.

Does A3721 fit Yamaha F115?
Yes. The supplied fitment includes extensive F115 applications from early engines through later models.

Does this fit Yamaha F75, F80, F90 and F100?
Yes. Select models from each of those engine families are included in the verified fitment above.

Does A3721 fit Yamaha LF115?
Yes. Multiple LF115 applications are included.

Do you stock the exhaust valve stem seal?
Yes. Both Yamaha OEM K0A-A3722 and Pro Marine A3722 exhaust valve stem seals are linked above.

Do you stock the intake and exhaust valves?
Yes. Pro Marine 68V-12111P intake and 68V-12121P exhaust valves are linked above.

Do you stock the valve spring?
Yes. The Pro Marine 67F-12114P valve spring is linked above.

Searchable Part Numbers & Terms

A3721, Pro Marine A3721, K0A-A3721-00-00, K0AA37210000, K0A-A3721, Yamaha intake valve seal, Yamaha intake valve stem seal, aftermarket Yamaha valve seal, Yamaha F75 valve seal, Yamaha F80 valve seal, Yamaha F90 valve seal, Yamaha F100 valve seal, Yamaha F115 valve seal, Yamaha LF115 valve seal, F115 intake valve seal, F115 valve stem seal, K0A-A3722, A3722, Yamaha exhaust valve seal, 67F-12114P, 67F-12114-00-00, Yamaha valve spring, 68V-12111P, Yamaha intake valve, 68V-12121P, Yamaha exhaust valve, Yamaha F115 cylinder head rebuild, Yamaha valve train parts, Yamaha engine rebuild parts

OEM Number

Yamaha Outboard Fitment

Pro Marine Aftermarket Option

Pro Marine Exhaust Valve Stem Seal - A3722

Pro Marine aftermarket replacement for the compatible Yamaha OEM exhaust valve stem seal application.

Brand: Pro Marine
Type: Exhaust Valve Stem Seal
Replaces: K0A-A3722-00-00

View Pro Marine Exhaust Valve Seal

Related Cylinder Head Rebuild Parts

Pro Marine Valve Spring - 67F-12114P

Replacement valve spring for compatible Yamaha F75-F115 four-stroke cylinder heads.

OEM: 67F-12114-00-00
Mercury Cross Reference: 804131

View Valve Spring

Yamaha OEM Intake Valve Stem Seal

Matching genuine Yamaha intake-side valve stem seal for compatible cylinder heads.

OEM: K0A-A3721-00-00

View OEM Intake Valve Seal

Pro Marine Intake Valve Stem Seal - A3721

Aftermarket intake valve stem seal for compatible Yamaha four-stroke cylinder heads.

Replaces: K0A-A3721-00-00

View Pro Marine Intake Seal

Pro Marine Intake Valve - 68V-12111P

Length: 96.9mm
Head Diameter: 29mm

Replacement intake valve for compatible Yamaha four-stroke cylinder-head rebuilds.

View Intake Valve

Pro Marine Exhaust Valve - 68V-12121P

Length: 99.3mm
Head Diameter: 23.9mm

Replacement exhaust valve for compatible Yamaha four-stroke cylinder-head rebuilds.

View Exhaust Valve

Valve Train Service Components

What This Part is Used For

The exhaust valve stem seal fits around the exhaust valve stem and helps control the amount of engine oil passing between the valve stem and valve guide.

The exhaust valve operates in a particularly high-temperature area of the cylinder head. The valve stem seal must provide controlled lubrication to the valve stem and guide while limiting excessive engine oil from entering the exhaust port or combustion chamber.

Why Exhaust Valve Stem Seals Matter

Valve stem seals are exposed to repeated heat cycles and can harden, deteriorate or become damaged over time. A worn seal may allow excessive oil to travel past the valve guide.

During a cylinder-head rebuild, replacing worn valve seals while the valve train is already disassembled can help prevent future oil-control issues and avoid additional cylinder-head disassembly.

When to Replace Exhaust Valve Stem Seals

• During a complete cylinder-head rebuild
• When replacing exhaust valves
• When servicing valve guides
• If the existing seal is hardened, cracked or damaged
• When excessive oil consumption is traced to the cylinder head
• After engine overheating or valve-train damage
• During a complete powerhead overhaul

Inspect These Components at the Same Time

• Exhaust valve stems
• Intake valve stems
• Intake valve stem seals
• Valve guides
• Valve seats
• Valve springs
• Valve spring retainers
• Valve keepers
• Camshaft lobes and journals
• Cylinder-head sealing surfaces

Shop Yamaha Engine Rebuild Parts by Model

Pro Marine stocks pistons, piston rings, crankshaft bearings, connecting rod bearings, cylinder sleeves, intake and exhaust valves, valve seals, gaskets and other internal Yamaha four-stroke components.

Shop Yamaha Engine Rebuild Parts by Model

Key Features

• Genuine Yamaha OEM exhaust valve stem seal
• OEM number K0A-A3722-00-00
• Fits select Yamaha F75 applications
• Fits select Yamaha F80 applications
• Fits select Yamaha F90 applications
• Fits select Yamaha F100 applications
• Fits extensive Yamaha F115 applications
• Fits Yamaha LF115 applications
• Pro Marine A3722 aftermarket alternative linked above
• OEM and Pro Marine intake valve seals linked above
• Valve spring linked above
• Replacement intake and exhaust valves linked above

FAQ

What is the Yamaha OEM number for this exhaust valve seal?
The OEM number is K0A-A3722-00-00.

Is this a genuine Yamaha part?
Yes. This listing is for the Yamaha OEM exhaust valve stem seal.

Do you have a Pro Marine version?
Yes. The Pro Marine A3722 aftermarket exhaust valve seal is linked above.

Does K0A-A3722-00-00 fit Yamaha F115?
Yes. The supplied fitment includes extensive F115 applications from early engines through later model variants.

Does this fit Yamaha F75, F80, F90 and F100?
Yes. Select applications from each of those Yamaha four-stroke engine families are included in the fitment above.

Does it fit Yamaha LF115?
Yes. Multiple LF115 applications are included.

Do you stock the intake valve stem seal?
Yes. Both the Yamaha OEM K0A-A3721-00-00 and Pro Marine A3721 intake valve stem seals are linked above.

Do you stock the exhaust valve?
Yes. The Pro Marine 68V-12121P exhaust valve is linked above.

Do you stock the intake valve?
Yes. The Pro Marine 68V-12111P intake valve is linked above.

Do you stock the valve spring?
Yes. The Pro Marine 67F-12114P valve spring is linked above.

Searchable Part Numbers & Terms

K0A-A3722-00-00, K0AA37220000, K0A-A3722, Yamaha exhaust valve seal, Yamaha exhaust valve stem seal, Yamaha OEM exhaust valve seal, Yamaha F75 valve seal, Yamaha F80 valve seal, Yamaha F90 valve seal, Yamaha F100 valve seal, Yamaha F115 valve seal, Yamaha LF115 valve seal, F115 exhaust valve seal, F115 valve stem seal, A3722, Pro Marine A3722, K0A-A3721-00-00, K0A-A3721, A3721, Yamaha intake valve seal, 67F-12114P, 67F-12114-00-00, Yamaha valve spring, 68V-12111P, Yamaha intake valve, 68V-12121P, Yamaha exhaust valve, Yamaha F115 cylinder head rebuild, Yamaha valve train parts, Yamaha engine rebuild parts

OEM Numbers & Cross References

Valve Specifications

Yamaha Outboard Fitment

Mercury Outboard Fitment

Mercury fitment below is based on the Mercury catalog applications shown for this valve family.

Matching Pro Marine Intake Valve

Pro Marine Intake Valve - 68V-12111P

Matching Pro Marine intake valve for compatible Yamaha / Mercury four-stroke cylinder-head rebuilds.

Length: 96.9mm
Head Diameter: 29mm

OEM Numbers: 67F-12111-00-00, 68V-12111-00-00, 804128T

View Pro Marine Intake Valve

Related Cylinder Head Rebuild Parts

Pro Marine Valve Spring - 67F-12114P

Replacement valve spring for compatible Yamaha / Mercury four-stroke cylinder heads.

OEM Numbers: 67F-12114-00-00, 804131

View Valve Spring

Yamaha OEM Intake Valve Stem Seal

Genuine Yamaha intake-side valve stem seal for compatible cylinder-head applications.

OEM Number: K0A-A3721-00-00

View OEM Intake Valve Seal

Pro Marine Intake Valve Stem Seal - A3721

Pro Marine aftermarket intake valve stem seal for compatible four-stroke applications.

Replaces: K0A-A3721-00-00

View Pro Marine Intake Seal

Yamaha OEM Exhaust Valve Stem Seal

Genuine Yamaha exhaust valve stem seal for compatible Yamaha four-stroke cylinder heads.

OEM Number: K0A-A3722-00-00

View OEM Exhaust Valve Seal

Pro Marine Exhaust Valve Stem Seal - A3722

Pro Marine aftermarket exhaust valve stem seal for compatible Yamaha four-stroke cylinder heads.

Replaces: K0A-A3722-00-00

View Pro Marine Exhaust Seal

Complete Valve Train Components

What This Part is Used For

The exhaust valve opens during the engine's exhaust stroke to allow combustion gases to leave the cylinder. It then closes against the valve seat so the cylinder can seal during the next compression and combustion cycle.

Exhaust valves operate in one of the hottest areas of the cylinder head, making correct valve condition, valve-seat contact and valve-guide clearance especially important.

When Should an Exhaust Valve Be Replaced?

Exhaust valves should be inspected whenever the cylinder head is removed or rebuilt. A burned, bent, worn or damaged exhaust valve can prevent the cylinder from sealing correctly and contribute to poor compression and engine performance.

Always inspect the valve seat, guide and stem seal when replacing the exhaust valve.

Common Reasons for Exhaust Valve Replacement

• Burned or damaged valve face
• Bent valve stem
• Piston-to-valve contact
• Excessive valve stem wear
• Corrosion or pitting
• Valve face no longer sealing correctly
• Low cylinder compression caused by valve leakage
• Cylinder-head rebuilding
• Complete powerhead overhaul

Inspect These Parts During Exhaust Valve Replacement

• Exhaust valve seat
• Exhaust valve guide clearance
• Exhaust valve stem seal
• Intake valve and intake valve stem seal
• Valve spring
• Valve retainer and keepers
• Camshaft lobes and journals
• Cylinder-head sealing surface

Shop Yamaha Engine Rebuild Parts by Model

Pro Marine stocks pistons, piston rings, crankshaft main bearings, connecting rod bearings, cylinder sleeves, intake and exhaust valves, valve stem seals, gaskets and other internal Yamaha four-stroke engine components.

Key Features

• Pro Marine aftermarket exhaust valve
• Part number 68V-12121P
• 99.3mm overall length
• 23.9mm head diameter
• Replaces Yamaha 67F-12121-00-00
• Replaces Yamaha 68V-12121-00-00
• Replaces Yamaha 68V-12121-01-00
• Cross references Mercury 804129T
• Fits select Yamaha F75 engines
• Fits select Yamaha F80 engines
• Fits select Yamaha F90 engines
• Fits select Yamaha F100 engines
• Fits extensive Yamaha F115 and LF115 applications
• Fits select Mercury 75-115HP four-stroke engines
• Matching Pro Marine intake valve linked above
• Valve spring linked above
• OEM and Pro Marine intake valve seals linked above
• OEM and Pro Marine exhaust valve seals linked above

FAQ

What OEM numbers does 68V-12121P replace?
It replaces Yamaha 67F-12121-00-00, 68V-12121-00-00 and 68V-12121-01-00, and cross references Mercury 804129T.

What size is the 68V-12121P exhaust valve?
The valve measures 99.3mm long with a 23.9mm head diameter.

Does 68V-12121P fit Yamaha F115?
Yes. The supplied fitment includes extensive Yamaha F115 and LF115 applications.

Does this exhaust valve fit Yamaha F75, F80, F90 and F100?
Yes. Select applications from each of those engine families are included in the verified fitment above.

Does this fit Mercury 115 EFI?
Yes. Mercury catalog fitment includes 115HP EFI applications in 0T178500 thru 0T800999, 0T801000 thru 1B226999, and 1B227000 thru 1B366822.

What other Mercury engines use this exhaust valve?
Catalog applications also include select Mercury 75HP and 90HP carbureted models and 75HP, 80HP, 90HP and 100HP EFI engines.

Do you stock the matching intake valve?
Yes. The Pro Marine 68V-12111P intake valve is linked above.

Do you stock the exhaust valve stem seal?
Yes. Both the Yamaha OEM K0A-A3722-00-00 and Pro Marine A3722 exhaust valve seals are linked above.

Do you stock the intake valve stem seal?
Yes. Both the Yamaha OEM K0A-A3721-00-00 and Pro Marine A3721 intake valve seals are linked above.

Do you stock the valve spring?
Yes. The Pro Marine 67F-12114P valve spring is linked above.

Searchable Part Numbers & Terms

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OEM Numbers & Cross References

Valve Specifications

Yamaha Outboard Fitment

Mercury Outboard Fitment

Mercury fitment below is based on the catalog applications for the 804128T intake valve.

Matching Pro Marine Exhaust Valve

Pro Marine Exhaust Valve - 68V-12121P

Matching Pro Marine exhaust valve for compatible Yamaha four-stroke cylinder-head rebuilds.

Length: 99.3mm
Head Diameter: 23.9mm

View Pro Marine Exhaust Valve

Related Cylinder Head Rebuild Parts

Pro Marine Valve Spring - 67F-12114P

Replacement valve spring used in compatible Yamaha / Mercury four-stroke cylinder heads.

OEM: 67F-12114-00-00
Mercury: 804131

View Valve Spring

Yamaha OEM Intake Valve Stem Seal

Genuine Yamaha OEM intake valve stem seal used with compatible cylinder-head applications.

OEM: K0A-A3721-00-00

View OEM Intake Valve Seal

Pro Marine Intake Valve Stem Seal - A3721

Pro Marine aftermarket intake valve stem seal for compatible Yamaha four-stroke engines.

Replaces: K0A-A3721-00-00

View Pro Marine Intake Seal

Yamaha OEM Exhaust Valve Stem Seal

Genuine Yamaha OEM exhaust valve stem seal for compatible four-stroke cylinder heads.

OEM: K0A-A3722-00-00

View OEM Exhaust Valve Seal

Pro Marine Exhaust Valve Stem Seal - A3722

Pro Marine aftermarket exhaust valve stem seal for compatible Yamaha four-stroke cylinder heads.

Replaces: K0A-A3722-00-00

View Pro Marine Exhaust Seal

Complete Valve Train Components

What This Part is Used For

The intake valve opens during the engine's intake cycle to allow the air / fuel charge to enter the combustion chamber. The valve then closes against its seat so the cylinder can seal during compression and combustion.

Proper valve sealing is critical to cylinder compression, combustion efficiency and overall engine performance.

When Should an Intake Valve Be Replaced?

Intake valves should be carefully inspected whenever the cylinder head is removed or rebuilt. A damaged valve may not seal correctly against the valve seat and can contribute to low compression or poor engine performance.

Valve condition should be evaluated together with the valve guide and valve seat rather than replacing the valve alone without inspecting the mating components.

Common Reasons for Intake Valve Replacement

• Bent valve stem
• Valve-to-piston contact
• Damaged or burned valve face
• Excessive valve stem wear
• Corrosion or pitting
• Valve face no longer sealing correctly
• Cylinder-head rebuild
• Major powerhead overhaul

Inspect These Parts During Valve Replacement

• Valve seat condition
• Valve guide clearance
• Intake valve stem seal
• Exhaust valve and exhaust valve stem seal
• Valve spring condition
• Valve retainers and keepers
• Camshaft lobes
• Camshaft journals
• Cylinder-head sealing surface

Shop Yamaha Engine Rebuild Parts by Model

Pro Marine stocks pistons, piston rings, crankshaft bearings, connecting rod bearings, cylinder sleeves, valves, valve stem seals, gaskets and other internal Yamaha four-stroke engine components.

Key Features

• Pro Marine aftermarket intake valve
• Part number 68V-12111P
• 96.9mm overall length
• 29mm head diameter
• Replaces Yamaha 67F-12111-00-00
• Replaces Yamaha 68V-12111-00-00
• Cross references Mercury 804128T
• Fits select Yamaha F75 engines
• Fits select Yamaha F80 engines
• Fits select Yamaha F90 engines
• Fits select Yamaha F100 engines
• Fits extensive Yamaha F115 and LF115 applications
• Fits select Mercury 75-115HP four-stroke engines
• Matching Pro Marine exhaust valve linked above
• Valve spring linked above
• OEM and Pro Marine intake valve seals linked above
• OEM and Pro Marine exhaust valve seals linked above

FAQ

What OEM numbers does 68V-12111P replace?
It replaces Yamaha 67F-12111-00-00 and 68V-12111-00-00, and cross references Mercury 804128T.

What size is the 68V-12111P intake valve?
It measures 96.9mm long with a 29mm head diameter.

Does 68V-12111P fit Yamaha F115?
Yes. The supplied fitment includes extensive Yamaha F115 and LF115 applications.

Does this valve fit Yamaha F75, F80, F90 and F100?
Yes. Select applications from each of those Yamaha engine families are listed above.

Does this intake valve fit Mercury 115 EFI?
Yes. Mercury catalog applications include 115HP EFI engines in 0T178500 thru 0T800999, 0T801000 thru 1B226999, and 1B227000 thru 1B366822.

What other Mercury engines use this valve?
Catalog applications also include select Mercury 75HP and 90HP carbureted engines and 75HP, 80HP, 90HP and 100HP EFI engines.

Do you stock the matching exhaust valve?
Yes. The Pro Marine 68V-12121P exhaust valve is linked above.

Do you stock the intake valve stem seal?
Yes. Pro Marine stocks both Yamaha OEM K0A-A3721-00-00 and Pro Marine A3721 intake valve seals.

Do you stock the exhaust valve stem seal?
Yes. Both Yamaha OEM K0A-A3722-00-00 and Pro Marine A3722 exhaust valve seals are linked above.

Do you stock the valve spring?
Yes. The Pro Marine 67F-12114P valve spring is linked above.

Searchable Part Numbers & Terms

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