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Pro Marine Aftermarket Intake Valve Stem Seal
Yamaha F75-F115 Intake Valve Stem Seal - Pro Marine A3721
The Pro Marine A3721 Intake Valve Stem Seal is an aftermarket replacement for select Yamaha four-stroke outboard cylinder heads using Yamaha OEM K0A-A3721-00-00.
Verified applications include select F75, F80, F90, F100, F115 and LF115 Yamaha four-stroke engines.
Pro Marine also stocks the genuine Yamaha OEM version, plus the matching exhaust valve seals, valve spring, intake valve and exhaust valve used during cylinder-head rebuilding.
Pro Marine: A3721
Yamaha OEM: K0A-A3721-00-00
Application: Intake Valve Stem Seal
OEM & Cross Reference Numbers
| Brand / Type | Part Number |
|---|---|
| Pro Marine | A3721 |
| Yamaha OEM | K0A-A3721-00-00 |
Yamaha Outboard Fitment
| Engine Family | Verified Applications |
|---|---|
| F75 |
F75TLRB - 2003 F75TLRC - 2004 F75TLRD - 2005 F75LA / F75LA_0112 - 2006-Present F75TLR / F75TLR_041 - 2006-Present |
| F80 |
F80TLRX / F80TXRX - 1999 F80TLRY / F80TXRY - 2000 F80TLRZ - 2001 F80TJRA / F80TLRA - 2002 F80TJRB / F80TLRB - 2003 |
| F90 |
F90TJRB / F90TLRB - 2003 F90TJRC / F90TLRC - 2004 F90TJRD / F90TLRD / F90TXRD - 2005 F90JA / F90JA_0112 - 2006-Present F90LA / F90LA_0112 - 2006-Present F90TJR / F90TJR_041 - 2006-Present F90TLR / F90TLR_041 - 2006-Present F90TXR / F90TXR_041 - 2006-Present F90XA / F90XA_0112 - 2006-Present |
| F100 |
F100TLRX / F100TXRX - 1999 F100TLRY / F100TXRY - 2000 F100TLRZ / F100TXRZ - 2001 F100TLRA / F100TXRA - 2002 F100TLRB / F100TXRB - 2003 |
| F115 - 2000-2005 |
F115TLRY / F115TXRY - 2000 F115TLRZ / F115TXRZ - 2001 F115TJRA / F115TLRA / F115TXRA - 2002 F115TJRB / F115TLRB / F115TXRB - 2003 F115TJRC / F115TLRC / F115TXRC - 2004 F115TJRD / F115TLRD / F115TXRD - 2005 |
| F115 - Later Models | F115JA, F115LA, F115TJR, F115TLR, F115TXR and F115XA applications from 2006-Present, including supplied 011, 061, 04 and 0405-0411 suffix variants. |
| LF115 |
LF115TXRY - 2000 LF115TXRZ - 2001 LF115TXRA - 2002 LF115TXRB - 2003 LF115TXRC - 2004 LF115TXRD - 2005 LF115TXR / LF115TXR_0 / 0405-0407 - 2006-Present LF115XA / LF115XA_01 / LF115XA_06 - 2006-Present |
Verify the complete Yamaha model number before ordering. Yamaha used different cylinder-head and valve-train components across similar horsepower families.
Confirm that the engine application calls for K0A-A3721-00-00.
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
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 ValveValve Train Service Components
| Component | OEM / Aftermarket Option |
|---|---|
| Intake Valve Stem Seal | Pro Marine A3721 / Yamaha OEM K0A-A3721-00-00 |
| Exhaust Valve Stem Seal | Pro Marine A3722 / Yamaha OEM K0A-A3722 |
| Valve Spring | Pro Marine 67F-12114P |
| Intake Valve | Pro Marine 68V-12111P |
| Exhaust Valve | Pro Marine 68V-12121P |
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.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 in the continental U.S.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before returning parts.
Need help verifying fitment?
Contact Pro Marine
Phone: 941-721-3000
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
Genuine Yamaha OEM Exhaust Valve Stem Seal
Yamaha F75-F115 Exhaust Valve Stem Seal - OEM K0A-A3722-00-00
The Yamaha K0A-A3722-00-00 Exhaust Valve Stem Seal is a genuine OEM replacement seal for select Yamaha four-stroke outboard cylinder heads.
Verified applications include select F75, F80, F90, F100, F115 and LF115 Yamaha four-stroke engines.
Pro Marine also stocks the A3722 aftermarket exhaust valve seal, along with the matching intake valve seals, valve spring, intake valve and exhaust valve used during cylinder-head rebuilding.
OEM Number: K0A-A3722-00-00
Application: Exhaust Valve Stem
Engine Families: Yamaha F75-F115 and LF115
OEM Number
| Brand / Type | Part Number |
|---|---|
| Yamaha OEM | K0A-A3722-00-00 |
| Pro Marine Aftermarket Option | A3722 |
Yamaha Outboard Fitment
| Engine Family | Verified Applications |
|---|---|
| F75 |
F75TLRB - 2003 F75TLRC - 2004 F75TLRD - 2005 F75LA / F75LA_0112 - 2006-Present F75TLR / F75TLR_041 - 2006-Present |
| F80 |
F80TLRX / F80TXRX - 1999 F80TLRY / F80TXRY - 2000 F80TLRZ - 2001 F80TJRA / F80TLRA - 2002 F80TJRB / F80TLRB - 2003 |
| F90 |
F90TJRB / F90TLRB - 2003 F90TJRC / F90TLRC - 2004 F90TJRD / F90TLRD / F90TXRD - 2005 F90JA / F90JA_0112 - 2006-Present F90LA / F90LA_0112 - 2006-Present F90TJR / F90TJR_041 - 2006-Present F90TLR / F90TLR_041 - 2006-Present F90TXR / F90TXR_041 - 2006-Present F90XA / F90XA_0112 - 2006-Present |
| F100 |
F100TLRX / F100TXRX - 1999 F100TLRY / F100TXRY - 2000 F100TLRZ / F100TXRZ - 2001 F100TLRA / F100TXRA - 2002 F100TLRB / F100TXRB - 2003 |
| F115 - 2000-2005 |
F115TLRY / F115TXRY - 2000 F115TLRZ / F115TXRZ - 2001 F115TJRA / F115TLRA / F115TXRA - 2002 F115TJRB / F115TLRB / F115TXRB - 2003 F115TJRC / F115TLRC / F115TXRC - 2004 F115TJRD / F115TLRD / F115TXRD - 2005 |
| F115 - Later Models | F115JA, F115LA, F115TJR, F115TLR, F115TXR and F115XA applications from 2006-Present, including supplied 011, 061, 04 and 0405-0411 suffix variants. |
| LF115 |
LF115TXRY - 2000 LF115TXRZ - 2001 LF115TXRA - 2002 LF115TXRB - 2003 LF115TXRC - 2004 LF115TXRD - 2005 LF115TXR / LF115TXR_0 / 0405-0407 - 2006-Present LF115XA / LF115XA_01 / LF115XA_06 - 2006-Present |
Verify the complete Yamaha model number before ordering. Yamaha used different cylinder-head and valve-train components across similar horsepower families.
Confirm that the engine application calls for K0A-A3722-00-00.
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
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
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 ValveValve Train Service Components
| Component | OEM / Aftermarket Option |
|---|---|
| Exhaust Valve Stem Seal | Yamaha OEM K0A-A3722-00-00 / Pro Marine A3722 |
| Intake Valve Stem Seal | Yamaha OEM K0A-A3721-00-00 / Pro Marine A3721 |
| Valve Spring | Pro Marine 67F-12114P |
| Intake Valve | Pro Marine 68V-12111P |
| Exhaust Valve | Pro Marine 68V-12121P |
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.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 in the continental U.S.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before returning parts.
Need help verifying fitment?
Contact Pro Marine
Phone: 941-721-3000
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
Pro Marine Yamaha / Mercury 4-Stroke Exhaust Valve
Yamaha F75-F115 & Mercury 75-115HP Exhaust Valve - 68V-12121P
The Pro Marine 68V-12121P Exhaust Valve is an aftermarket replacement exhaust valve for select Yamaha inline four-cylinder four-stroke outboards and related Mercury four-stroke applications.
This valve measures 99.3mm in overall length with a 23.9mm head diameter. It replaces Yamaha OEM 67F-12121-00-00, 68V-12121-00-00 and 68V-12121-01-00, and cross references Mercury 804129T.
Pro Marine also stocks the matching intake valve, valve spring, and both OEM Yamaha and Pro Marine intake and exhaust valve stem seals for complete cylinder-head rebuilding.
Length: 99.3mm
Head Diameter: 23.9mm
Position: Exhaust
Brand: Pro Marine
OEM Numbers & Cross References
| Brand / Type | Part Number |
|---|---|
| Pro Marine | 68V-12121P |
| Yamaha OEM | 67F-12121-00-00 |
| Yamaha OEM | 68V-12121-00-00 |
| Yamaha OEM | 68V-12121-01-00 |
| Mercury OEM | 804129T |
Valve Specifications
| Specification | Details |
|---|---|
| Valve Type | Exhaust Valve |
| Overall Length | 99.3mm |
| Head Diameter | 23.9mm |
| Brand | Pro Marine |
| Application | Yamaha / Mercury 4-Stroke Outboard |
Yamaha Outboard Fitment
| Engine Family | Verified Applications |
|---|---|
| F75 |
F75TLRB - 2003 F75TLRC - 2004 F75TLRD - 2005 |
| F80 |
F80TLRX / F80TXRX - 1999 F80TLRY / F80TXRY - 2000 F80TLRZ - 2001 F80TJRA / F80TLRA - 2002 F80TJRB / F80TLRB - 2003 |
| F90 |
F90TJRB / F90TLRB - 2003 F90TJRC / F90TLRC - 2004 F90TJRD / F90TLRD / F90TXRD - 2005 |
| F100 |
F100TLRX / F100TXRX - 1999 F100TLRY / F100TXRY - 2000 F100TLRZ / F100TXRZ - 2001 F100TLRA / F100TXRA - 2002 F100TLRB / F100TXRB - 2003 |
| F115 - 2000-2005 |
F115TLRY / F115TXRY - 2000 F115TLRZ / F115TXRZ - 2001 F115TJRA / F115TLRA / F115TXRA - 2002 F115TJRB / F115TLRB / F115TXRB - 2003 F115TJRC / F115TLRC / F115TXRC - 2004 F115TJRD / F115TLRD / F115TXRD - 2005 |
| F115 - Later Models | F115TJR, F115TLR and F115TXR families - 2006-Present, including the supplied 04, 0405, 0406, 0407, 0408, 0409, 0410 and 0411 variants. |
| LF115 |
LF115TXRY - 2000 LF115TXRZ - 2001 LF115TXRA - 2002 LF115TXRB - 2003 LF115TXRC - 2004 LF115TXRD - 2005 LF115TXR / LF115TXR_0405 / LF115TXR_0406 / LF115TXR_0407 - 2006-Present |
Mercury Outboard Fitment
Mercury fitment below is based on the Mercury catalog applications shown for this valve family.
| Mercury Engine | Serial Number Range |
|---|---|
| 75HP Carb | 0G960500 thru 0T800999 |
| 75HP Carb Bodensee | 0G960500 thru 0T800999 |
| 90HP Carb | 0G960500 thru 0T800999 |
| 75HP Carb | 0T801000 thru 1B226999 |
| 75HP Carb Bodensee | 0T801000 thru 1B226999 |
| 90HP Carb | 0T801000 thru 1B226999 |
| 75HP EFI | 1B172291 thru 1B366822 |
| 80HP EFI | 1B227000 thru 1B366822 |
| 90HP EFI | 1B172291 thru 1B366822 |
| 100HP EFI | 1B227000 thru 1B366822 |
| 115HP EFI | 1B227000 thru 1B366822 |
| 115HP EFI | 0T178500 thru 0T800999 |
| 115HP EFI | 0T801000 thru 1B226999 |
For Yamaha applications, verify the complete engine model. For Mercury, verify the engine serial number and confirm the original exhaust valve cross references 804129T.
Intake and exhaust valves are different and are not interchangeable.
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
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 SealComplete Valve Train Components
| Component | Part Number / Option |
|---|---|
| Exhaust Valve | Pro Marine 68V-12121P |
| Intake Valve | Pro Marine 68V-12111P |
| Valve Spring | Pro Marine 67F-12114P |
| Intake Valve Stem Seal | Yamaha OEM K0A-A3721-00-00 / Pro Marine A3721 |
| Exhaust Valve Stem Seal | Yamaha OEM K0A-A3722-00-00 / Pro Marine A3722 |
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.
Yamaha Outboard Engine Rebuild Parts by Model
Browse internal engine components organized by Yamaha horsepower and engine family to locate compatible pistons, rings, bearings, sleeves, valves and gaskets.
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.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 in the continental U.S.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before returning parts.
Need help verifying fitment?
Contact Pro Marine
Phone: 941-721-3000
Searchable Part Numbers & Terms
68V-12121P, 68V-12121-00-00, 68V-12121-01-00, 68V121210000, 68V121210100, 67F-12121-00-00, 67F121210000, 804129T, Mercury 804129T, Yamaha exhaust valve, Yamaha F75 exhaust valve, Yamaha F80 exhaust valve, Yamaha F90 exhaust valve, Yamaha F100 exhaust valve, Yamaha F115 exhaust valve, Yamaha LF115 exhaust valve, Mercury 75 exhaust valve, Mercury 80 exhaust valve, Mercury 90 exhaust valve, Mercury 100 exhaust valve, Mercury 115 exhaust valve, Mercury 115 EFI exhaust valve, 99.3mm exhaust valve, 23.9mm exhaust valve, 68V-12111P, Yamaha intake valve, 67F-12114P, 67F-12114-00-00, Yamaha valve spring, K0A-A3721-00-00, A3721, Yamaha intake valve seal, K0A-A3722-00-00, A3722, Yamaha exhaust valve seal, Yamaha F115 cylinder head rebuild, Yamaha engine rebuild parts
68V-12121-00-00
68V-12121-01-00
804129T
Pro Marine Yamaha / Mercury 4-Stroke Intake Valve
Yamaha F75-F115 & Mercury 75-115HP Intake Valve - 68V-12111P
The Pro Marine 68V-12111P Intake Valve is an aftermarket replacement intake valve for select Yamaha inline four-cylinder four-stroke outboards and related Mercury four-stroke applications.
This valve measures 96.9mm in overall length with a 29mm valve head diameter. It replaces Yamaha 67F-12111-00-00 and 68V-12111-00-00, and cross references Mercury 804128T.
Pro Marine also stocks the matching exhaust valve, valve spring, and both OEM Yamaha and Pro Marine intake and exhaust valve stem seals for complete cylinder-head rebuilding.
Length: 96.9mm
Head Diameter: 29mm
Position: Intake
Brand: Pro Marine
OEM Numbers & Cross References
| Brand / Type | Part Number |
|---|---|
| Pro Marine | 68V-12111P |
| Yamaha OEM | 67F-12111-00-00 |
| Yamaha OEM | 68V-12111-00-00 |
| Mercury OEM | 804128T |
Valve Specifications
| Specification | Details |
|---|---|
| Valve Type | Intake Valve |
| Overall Length | 96.9mm |
| Head Diameter | 29mm |
| Brand | Pro Marine |
| Application | Yamaha / Mercury 4-Stroke Outboard |
Yamaha Outboard Fitment
| Engine Family | Verified Applications |
|---|---|
| F75 |
F75TLRB - 2003 F75TLRC - 2004 F75TLRD - 2005 |
| F80 |
F80TLRX / F80TXRX - 1999 F80TLRY / F80TXRY - 2000 F80TLRZ - 2001 F80TJRA / F80TLRA - 2002 F80TJRB / F80TLRB - 2003 |
| F90 |
F90TJRB / F90TLRB - 2003 F90TJRC / F90TLRC - 2004 F90TJRD / F90TLRD / F90TXRD - 2005 |
| F100 |
F100TLRX / F100TXRX - 1999 F100TLRY / F100TXRY - 2000 F100TLRZ / F100TXRZ - 2001 F100TLRA / F100TXRA - 2002 F100TLRB / F100TXRB - 2003 |
| F115 - 2000-2005 |
F115TLRY / F115TXRY - 2000 F115TLRZ / F115TXRZ - 2001 F115TJRA / F115TLRA / F115TXRA - 2002 F115TJRB / F115TLRB / F115TXRB - 2003 F115TJRC / F115TLRC / F115TXRC - 2004 F115TJRD / F115TLRD / F115TXRD - 2005 |
| F115 - Later Models | F115TJR, F115TLR and F115TXR families - 2006-Present, including the supplied 04, 0405, 0406, 0407, 0408, 0409, 0410 and 0411 variants. |
| LF115 |
LF115TXRY - 2000 LF115TXRZ - 2001 LF115TXRA - 2002 LF115TXRB - 2003 LF115TXRC - 2004 LF115TXRD - 2005 LF115TXR / LF115TXR_0405 / LF115TXR_0406 / LF115TXR_0407 - 2006-Present |
Mercury Outboard Fitment
Mercury fitment below is based on the catalog applications for the 804128T intake valve.
| Mercury Engine | Serial Number Range |
|---|---|
| 75HP Carb | 0G960500 thru 0T800999 |
| 75HP Carb Bodensee | 0G960500 thru 0T800999 |
| 90HP Carb | 0G960500 thru 0T800999 |
| 75HP Carb | 0T801000 thru 1B226999 |
| 75HP Carb Bodensee | 0T801000 thru 1B226999 |
| 90HP Carb | 0T801000 thru 1B226999 |
| 75HP EFI | 1B172291 thru 1B366822 |
| 80HP EFI | 1B227000 thru 1B366822 |
| 90HP EFI | 1B172291 thru 1B366822 |
| 100HP EFI | 1B227000 thru 1B366822 |
| 115HP EFI | 1B227000 thru 1B366822 |
| 115HP EFI | 0T178500 thru 0T800999 |
| 115HP EFI | 0T801000 thru 1B226999 |
For Yamaha applications, verify the complete engine model. For Mercury applications, verify the serial number range and confirm that the engine calls for 804128T.
Intake and exhaust valves are different components and are not interchangeable.
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
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
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 SealComplete Valve Train Components
| Component | Part Number / Option |
|---|---|
| Intake Valve | Pro Marine 68V-12111P |
| Exhaust Valve | Pro Marine 68V-12121P |
| Valve Spring | Pro Marine 67F-12114P |
| Intake Valve Stem Seal | Yamaha OEM K0A-A3721-00-00 / Pro Marine A3721 |
| Exhaust Valve Stem Seal | Yamaha OEM K0A-A3722-00-00 / Pro Marine A3722 |
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.
Yamaha Outboard Engine Rebuild Parts by Model
Browse Yamaha rebuild components organized by engine family and horsepower to locate the correct pistons, bearings, valves, sleeves, seals and gasket components for your rebuild.
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.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 in the continental U.S.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before returning parts.
Need help verifying fitment?
Contact Pro Marine
Phone: 941-721-3000
Searchable Part Numbers & Terms
68V-12111P, 68V-12111-00-00, 68V121110000, 67F-12111-00-00, 67F121110000, 804128T, Mercury 804128T, Yamaha intake valve, Yamaha F75 intake valve, Yamaha F80 intake valve, Yamaha F90 intake valve, Yamaha F100 intake valve, Yamaha F115 intake valve, Yamaha LF115 intake valve, Mercury 75 intake valve, Mercury 80 intake valve, Mercury 90 intake valve, Mercury 100 intake valve, Mercury 115 intake valve, Mercury 115 EFI intake valve, 96.9mm intake valve, 29mm intake valve, 68V-12121P, Yamaha exhaust valve, 67F-12114P, Yamaha valve spring, K0A-A3721-00-00, A3721, Yamaha intake valve seal, K0A-A3722-00-00, A3722, Yamaha exhaust valve seal, Yamaha F115 cylinder head rebuild, Yamaha engine rebuild parts
68V-12111-00-00
804128T
887866T
887865T