Valves Seats and Springs | Yamaha Outboard

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

A3722, Pro Marine A3722, K0A-A3722-00-00, K0AA37220000, K0A-A3722, Yamaha exhaust valve seal, Yamaha exhaust 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 exhaust valve seal, F115 valve stem seal, 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

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

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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