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Home > Outboard

Outboard Motor Parts | OEM & Aftermarket

Shop OEM and aftermarket outboard motor parts for Mercury, Yamaha, Suzuki, Honda, Johnson / Evinrude / E-TEC, Tohatsu / Nissan, and Chrysler / Force engines. Pro Marine USA carries parts for routine maintenance, troubleshooting, repair, and complete marine engine rebuilds.

Browse by outboard manufacturer or engine system, or use our OEM parts lookup to identify the correct part number before ordering. Find cooling, fuel, ignition, electrical, internal engine, lower unit, steering, trim, service kit, gasket, seal, and rebuild parts in one place.

Shop Outboard Parts by Manufacturer

Chrysler / Force Outboard Parts for Chrysler and Force outboard repair

Honda Outboard Honda cooling, fuel, electrical, and engine parts

Johnson / Evinrude / E-TEC Outboard Johnson, Evinrude, E-TEC, and OMC replacement parts

Mercury Outboard Mercury and Mariner maintenance, repair, and rebuild parts

Suzuki Outboard Suzuki service, lower unit, fuel, and engine parts

Tohatsu / Nissan Outboard Tohatsu and Nissan outboard replacement parts

Yamaha Outboard Yamaha maintenance, repair, lower unit, and rebuild parts

Find the Correct Outboard Part

Not sure which part fits your engine? Start with the engine manufacturer, horsepower, model number, serial number, and year whenever available.

Our OEM parts lookup lets you view factory parts diagrams and identify the original part number for many popular outboard engines. Once you have the OEM number, search Pro Marine to find available OEM and aftermarket replacement options.

Use Our OEM Parts Lookup »

Shop Outboard Parts by Engine System

Outboard engines use several interconnected systems. Select your manufacturer above to browse the exact categories available for your engine, including the following common repair and maintenance areas.

Common Outboard Problems and Where to Start

Engine overheating: inspect the water pump, impeller, thermostat, pressure-control components, cooling passages, and engine anodes.
Hard starting or rough idle: check fuel delivery, carburetor or injector operation, spark plugs, ignition components, filters, and intake sealing.
Weak spark or no spark: test ignition coils, stators, switch boxes or ignition modules, sensors, wiring, grounds, and related electrical components.
Low compression or poor power: inspect pistons, rings, cylinder condition, head and powerhead gaskets, bearings, and other internal engine components.
Milky gear lube: inspect prop shaft, driveshaft, shift shaft, bearing carrier, and other lower unit seals for water intrusion.
Lower unit or gearcase noise: inspect bearings, gears, clutch components, shafts, and gear lube condition before continued operation.
Trim or steering problems: inspect hydraulic fluid level, seals, hoses, trim motors, pumps, steering cylinders, and mechanical connections.

Why Buy Outboard Parts from Pro Marine USA?

OEM and aftermarket replacement options for major outboard engine brands.
Marine engine parts for routine maintenance, professional repair, and complete rebuild projects.
OEM diagram and part-number lookup tools to help identify the correct component before ordering.
Dealer pricing available for qualified marine repair businesses and dealers.
Large selection of service kits, engine parts, lower unit components, fuel system parts, electrical parts, steering, and rigging products.
Same-day weekday shipping available on qualifying in-stock orders placed before the shipping cutoff.

OEM and Aftermarket Outboard Parts

OEM parts are supplied by the original engine manufacturer and are designed for the specific engine application. Aftermarket parts are replacement components produced by independent marine parts manufacturers and may provide additional availability or value for many common repairs.

Pro Marine carries both genuine OEM parts and quality aftermarket replacement parts for many outboard maintenance, repair, and rebuild applications. Always confirm fitment using the engine model, serial number, horsepower, year range, or OEM part number when available.

Frequently Asked Questions

How do I find the correct parts for my outboard motor?

Start by identifying the engine manufacturer, horsepower, model number, serial number, and year. Select the manufacturer above to browse by engine system, or use the OEM parts lookup to locate the original part number from a factory diagram.

Can I search Pro Marine by OEM part number?

Yes. If you already have the OEM part number, enter it into the Pro Marine site search to locate available OEM and aftermarket replacement options. If you do not know the part number, use the OEM parts lookup first.

What information should I have before ordering an outboard part?

Have the engine manufacturer, horsepower, model number, serial number, and year whenever possible. An OEM part number from the original component or parts diagram is especially helpful because visually similar parts may fit different engine families.

What is the difference between OEM and aftermarket outboard parts?

OEM parts come from the original engine manufacturer. Aftermarket parts are replacement components manufactured by other marine parts companies for compatible applications. Pro Marine carries both OEM and aftermarket options across many common outboard engine systems.

Are aftermarket outboard motor parts reliable?

Quality aftermarket marine parts are commonly used for maintenance, professional repair, and engine rebuilding. The best option depends on the application, manufacturer, availability, and customer preference.

Do you carry parts for older outboard motors?

Yes. Pro Marine carries parts for many older Mercury, Mariner, Johnson, Evinrude, Chrysler, Force, Yamaha, Honda, Suzuki, Nissan, and Tohatsu outboards. Availability varies by engine family and component.

What outboard parts are commonly replaced during routine maintenance?

Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump impellers, complete water pump kits, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.

Fitment Tip: Outboard parts can vary by model, serial range, horsepower, and production year. Confirm the OEM part number or engine identification information whenever possible before ordering.

|◀ ◀ 2989 - 3000 of 8467 ▶ ▶|

View:

Oil, Quicksilver DFI 2 Cycle

Mercury 2-Cycle Direct Inject

Item#:

858037Q01

Cross Reference#:

0764354
0764587
0773495
0775590
0777225
0779431
0779718
8M0061418
8M0075302
8M0229796
8M0229798
8M0229799
8M0229799
8M0230194
857489A01
858037KC1
858037K01
858037QB1
858037QC1
858037Q01
858037Q01
877694K1
877694K30
877694Q1
877694Q1
883701A01
883701A1

Manufacturer Item:

858037Q01

Manufacturer:

Mercury Marine

Available:

In Stock

Your Price:

74.99

Each

Qty:

Fill/Drain Kit

Johnson Evinrude Mercury

Item#:

18-2446

Manufacturer:

Sierra

Available:

In Stock

Your Price:

41.89

Each

Qty:

Spark Plug Champion QL82C

Stock # 931M

Item#:

QL82C

Cross Reference#:

0006314
0437680
0765873
437680
765873

Manufacturer Item:

437680

Manufacturer:

Champion Spark Plugs

Available:

In Stock

Your Price:

3.98

Each

Qty:

Relay, Trim/Tilt Up

Yamaha 115-225 HP 1991-2004 Suzuki 35-225 Tohatsu 15-140 Mercury 15-50

Item#:

R950-2

Cross Reference#:

3C8725810
3C8725810
38410-89J00
38410-94550
38410-94551
38410-94552
38420-87J00
38420-94550
5030831
5031483
5032195
5032197
5034362
6E5-81950-00-00
6E5-81950-01-00
8518391

Manufacturer Item:

6E5-81950-01-00

Manufacturer:

Pro Marine

Available:

In Stock

Your Price:

83.21

Each

Qty:

Genuine Mercury Crankshaft Oil Seal - Johnson/Evinrude, Mercury 30-250 HP

Upper and Lower Crankshaft Seal for Select Outboard and SportJet Engines

GENUINE MERCURY OEM REPLACEMENT PART

Genuine Mercury Upper and Lower Crankshaft Oil Seal - 41953-OE

The Genuine Mercury 41953-OE Upper and Lower Crankshaft Oil Seal is an OEM replacement seal used in select Mercury and Mariner outboard engines and Mercury SportJet applications.

This crankshaft oil seal is associated with numerous Mercury two-stroke outboard engine families, including select 30-125 HP inline engines, 135-200 HP V6 engines, 2.5L EFI models, and high-performance outboards. Additional Mercury catalog applications include SportJet 175, 200, 210, and 240 HP engines.

The supplied cross-reference list also includes numbers associated with Johnson and Evinrude replacement-part searches. Compatibility with those engines must be confirmed by their original part numbers and application diagrams.

Pro Marine USA also offers the Pro Marine 230 aftermarket crankshaft oil seal as an alternative for compatible applications.

Product Information

Item Number: 41953-OE
Manufacturer: Mercury Marine
Product Classification: Genuine Mercury OEM
Part Type: Crankshaft Oil Seal
Application: Upper or lower crankshaft sealing locations, depending on engine
Engine Types: Select Mercury and Mariner Outboards and Mercury SportJet Engines
Mercury Outboard Applications: Select 30-250 HP engine families
SportJet Applications: Select 175-240 HP models
Additional Cross-Reference Searches: Johnson and Evinrude
Aftermarket Alternative: Pro Marine 230

OEM and Cross Reference Numbers

The following OEM and aftermarket numbers are associated with this crankshaft oil seal. These references help customers locate replacement parts using original manufacturer numbers, older references, and aftermarket catalog numbers.

Part Number	Reference
41953-OE	Genuine Mercury OEM listing
41953	Mercury reference
41953B	Mercury reference
0313992	Cross reference
0764337	Cross reference
0777914	Cross reference
18-2016	Aftermarket cross reference
20079	Cross reference
25837	Cross reference
29476	Cross reference
313992	Cross reference
336232	Cross reference
508514	Cross reference
764337	Cross reference
775423	Cross reference
777914	Cross reference
9-76100	Aftermarket cross reference

Cross-reference listings do not necessarily indicate that every listed number is an identical OEM part or a direct supersession. Confirm the required seal against the original engine application.

What This Part Is Used For

The crankshaft oil seal helps maintain an effective seal around the crankshaft where it passes through the engine crankcase.

In two-stroke outboard engines, proper crankcase sealing is important because the engine relies on controlled crankcase pressure changes during operation.

A damaged crankshaft seal can allow unwanted air leakage, potentially contributing to starting problems, unstable idle, poor acceleration, or improper engine operation.

This replacement seal may be used during:

Upper crankshaft seal replacement
Lower crankshaft seal replacement
Outboard powerhead rebuilding
Crankcase sealing repairs
Engine restoration and preventive service
Repair of crankshaft seal leaks

The exact location and quantity required depend on the engine's crankcase and crankshaft configuration.

Important Fitment Information

This crankshaft oil seal is not universal across all Mercury, Mariner, Johnson, or Evinrude engines.

Mercury used different crankshaft seals throughout multiple engine generations. The correct seal depends on the engine model, serial number, and crankshaft sealing location.

The following Mercury fitment information is based on the supplied application charts. Always verify the original part number using the appropriate engine parts diagram before ordering.

Mercury and Mariner Outboard Engine Fitment

This crankshaft oil seal appears in Mercury catalog application records covering select inline, V6, EFI, and high-performance outboard engines.

The tables below identify engine families and representative serial-number ranges from the supplied application charts. Regional serial-number systems may differ.

Mercury 30-60 HP Outboard Applications

Engine Model	Serial Number Range	Catalog
30 HP 2-Cylinder	0G760300-0T079999 USA	90-803018
40 HP 2-Cylinder	0G760300-0T079999 USA	90-803018
30 HP Jet 3-Cylinder	0G760300-0T408999 USA	90-803026
40 HP 3-Cylinder	0G760300-0T079999 USA	90-803026
50 HP 3-Cylinder	0G760300-0T079999 USA	90-803026
30 and 40 HP 2-Cylinder	0G055314-0G760299 USA	90-80874494
50 and 60 HP 3-Cylinder	6428681-0B122929 USA	90-13288

Mercury 65-125 HP Outboard Applications

Engine Model	Serial Number Range	Catalog
70, 75, 80 and 90 HP 3-Cylinder	0B240451-0C221999 USA	90-18520
75 and 90 HP 3-Cylinder	0C222000-0D283221 USA	90-81589890
65 Jet, 75 and 90 HP 3-Cylinder	0D283222-0G760299 USA	90-81589894
65 Jet, 75 and 90 HP 3-Cylinder	0G760300-0T979999 USA	90-803147
80 Jet, 100, 115 and 125 HP	0D283222-0G760299 USA	90-1779394
80 Jet, 100, 115 and 125 HP	0G760300-0T979999 USA	90-803168
100 and 115 HP 4-Cylinder	0A722297-0D283221 USA	90-17793

Mercury V6 135-200 HP Outboard Applications

The supplied application charts include select Mercury V135, V150, V175, V200, XR4, XR6, Magnum, Magnum II, Magnum III, Marathon, EFI, and 2.5L V6 configurations.

Engine Family	Serial Number Range	Catalog
V135, V150, XR4 and Magnum II	0A904646-0C100860	90-13752 / 90-18739
V135, V150, XR4, V175 and V200	0C100861-0C239552	90-814019 / 90-814115 / 90-814116
V135, V150, XR4 Magnum II, V175 and V200	0C239553-0D081999	90-81609890
V150 XR2, Magnum, Marathon and Work	4868998-0A904645	90-818855
V135, V150, XR6 Magnum III, V175 and V200	0G760300-0G960499	90-803170
V135, V150, XR6 Magnum III, V175 and V200	0D082000-0G303045	90-81609892
V135, V150, XR6 Magnum III, V175 and V200	0G303046-0G760299	90-81609896
V150, V175 and V200	0G960500-0T408999	90-80317700
V150, V175 and V200	0G760300-0G960499	90-803177

Mercury 2.5L V6 and EFI Applications

Engine Model	Serial Number Range	Catalog
135, 150 and 175 HP V6 2.5L	0G960500-0T178499	90-80350200
135, 150 and 175 HP V6 2.5L	0T178500-0T800999	90-80350201
135, 150 and 175 HP V6 2.5L	0T801000-1B226999	90-803502004
135, 150 and 175 HP V6 2.5L	1B227000-1B417701	90-803502006
135, 150 and 175 HP V6 2.5L	1B417702-1B580029	90-803502007
150 HP EFI 2.5L	0T409000-0T800999	90-80317702
150 and 200 HP 2.5L	0T801000-1B226999	90-803177004
150 and 200 HP 2.5L	1B227000-2B121048	90-803177006

Mercury High-Performance Outboard Applications

Engine Model	Serial Number Range
150 HP Pro Max / Super Mag	0D935000-0G610079
200 HP EFI Pro Max / Super Mag	0D935000-0G610079
150/200 HP Pro Max / Super Mag	0G610050-0G856999
225 HP EFI Pro Max / Super Mag	0G857000-0T429939
225 HP EFI Pro Max / Super Mag	0G610104-0G856999
200 HP XS 6-Cylinder 2.5L	1E050852-1E053876

Mercury SportJet Engine Applications

The supplied Mercury application data includes SportJet engines listed under cylinder block, powerhead, and gasket-related catalog diagrams.

These records identify engine families in which the seal may appear in the associated parts catalog. Verify the seal location and original part number before ordering.

SportJet Engine	Serial Number Range	Catalog
175XR2 Jet Drive	0E369300-0E433153	90-804853R1
175XR2 Jet Drive	0E151580-0E369299	90-835085R2
200 DFI Jet Drive	1B321662-1B321669	90-8M0048139
200 DFI Jet Drive	0E435742-Present	90-8M0048139
200 DFI Jet Drive	0E384500-0E433151	90-881779
210 Carb M2 Jet Drive	0E373939-0E426999	90-804944R1
210 Carb Jet Drive	0E384500-0E433153	90-881770
240 EFI M2 Jet Drive	0E373939-0E384499	90-804945R1
240 EFI Jet Drive	0E384500-0E406399	90-881812
240 EFI M2 Jet Drive	0E406400-Present	90-885191

Johnson and Evinrude Cross-Reference Applications

This crankshaft oil seal is also associated with replacement-part searches for Johnson and Evinrude outboard engines.

The supplied cross-reference list includes:

0313992 / 313992
0764337 / 764337
0777914 / 777914
775423
336232
508514

Johnson and Evinrude Fitment Verification

Specific Johnson and Evinrude engine models, horsepower ranges, and years were not included in the supplied fitment charts. Match the original seal part number and confirm the application using the appropriate engine parts diagram before purchasing.

PRO MARINE AFTERMARKET ALTERNATIVE

Pro Marine 230 Upper and Lower Crankshaft Oil Seal

Looking for an aftermarket replacement? Pro Marine USA also offers Part Number 230, an alternative crankshaft oil seal for compatible Mercury, Johnson, and Evinrude applications.

Compare the original part number and engine fitment before selecting the OEM or aftermarket version.

View Pro Marine 230 Aftermarket Oil Seal

Common Reasons to Replace a Crankshaft Oil Seal

Crankshaft seal leakage
Crankcase air leaks
Hard starting or inconsistent engine operation
Unstable idle caused by a confirmed sealing problem
Seal damage discovered during powerhead disassembly
Crankshaft or crankcase service
Preventive replacement during engine rebuilding

These symptoms may also result from other engine problems. Proper diagnosis is recommended before replacing the crankshaft seal.

Installation and Service Tips

Confirm the original crankshaft oil seal part number.
Verify the correct engine model and serial-number range.
Identify whether the seal is required for the upper or lower crankshaft location.
Inspect the crankshaft sealing surface for wear or damage.
Remove the original seal carefully to avoid damaging surrounding components.
Install the replacement seal using the correct service procedure and tools.
Follow the manufacturer's specified seal orientation and installation depth.
Inspect related crankcase sealing components during reassembly.
Perform appropriate engine checks after completing the repair.

Crankshaft seal replacement may require specialized tools and engine disassembly. Consult the applicable Mercury service manual or a qualified marine technician.

Key Features and Benefits

Genuine Mercury OEM: Factory Mercury replacement component.
Crankshaft Sealing: Helps maintain proper sealing around the crankshaft.
Upper and Lower Applications: Referenced in crankshaft sealing locations depending on engine design.
Extensive Mercury Catalog Coverage: Listed across multiple Mercury outboard and SportJet engine families.
Cross-Reference Support: Multiple OEM and aftermarket numbers help identify compatible replacements.
Aftermarket Option: Pro Marine 230 is available separately.
Engine Rebuild Applications: Suitable for applicable crankcase and powerhead repairs.

Frequently Asked Questions

What is Mercury 41953-OE?

It is a genuine Mercury OEM crankshaft oil seal used in select Mercury and Mariner outboard engines and Mercury SportJet applications.

Does this crankshaft oil seal fit Johnson and Evinrude engines?

The supplied cross-reference list includes numbers associated with Johnson and Evinrude replacement-part searches. However, compatibility must be verified using the original engine part number and parts diagram.

What Mercury horsepower engines use this oil seal?

The supplied Mercury catalog records include select 30-125 HP inline outboards, 135-200 HP V6 models, and certain high-performance engines rated up to 250 HP. Fitment depends on the engine model and serial number.

Does this oil seal fit Mercury SportJet engines?

Yes, the supplied Mercury application charts include select 175XR2, 200 DFI, 210 Carb, and 240 EFI SportJet engine families. Verify the correct crankshaft seal location.

Can this seal be used in both upper and lower crankshaft positions?

This product is listed for upper and lower crankshaft oil seal applications. The correct location and quantity depend on the specific engine design.

Is this a genuine Mercury part or an aftermarket replacement?

This listing, 41953-OE, is for the genuine Mercury OEM version.

Is there a Pro Marine aftermarket version?

Yes. Pro Marine USA offers Pro Marine 230 Upper and Lower Crankshaft Oil Seal for compatible applications.

Can a worn crankshaft seal cause a poor idle?

Yes. A leaking crankshaft seal can affect crankcase sealing in a two-stroke engine, potentially contributing to poor idle or inconsistent running conditions.

Should crankshaft oil seals be replaced during an engine rebuild?

Crankshaft seals should be inspected during applicable engine rebuilding procedures. Replacement may be recommended when seals are worn, damaged, or disturbed during disassembly. Follow the engine manufacturer's service instructions.

How do I verify the correct crankshaft oil seal?

Use your engine model and serial number to locate the appropriate Mercury, Johnson, or Evinrude parts diagram. Confirm the original seal number and its position in the engine.

Dealer Discounts & Store Policies

Marine Dealer and Industry Discounts

Pro Marine USA supplies genuine OEM and aftermarket marine engine parts to professional marine technicians, repair shops, boat dealers, and retail customers.

Qualified marine businesses can apply for a Pro Marine dealer account to access wholesale pricing.

Apply for Dealer Pricing

Shipping Information

Free shipping on orders over $100 within the continental United States.
Orders received before 5:30 PM EST ship the same business day, Monday-Friday.
Shipping available through UPS, USPS, and FedEx.
Typical delivery time is 1-5 business days.

30-Day Return Policy

Returns accepted within 30 days of delivery.
Items must be new, unused, and in original packaging.
Installed parts are not returnable.
Return authorization is required before sending items back.

Need assistance identifying the correct crankshaft oil seal? Contact Pro Marine USA or call 941-721-3000.

Searchable Part Numbers

41953-OE, 41953, 41953B, 0313992, 0764337, 0777914, 18-2016, 20079, 25837, 29476, 313992, 336232, 508514, 764337, 775423, 777914, 9-76100, Pro Marine 230

Searchable Terms

Genuine Mercury crankshaft oil seal, Mercury 41953 crank seal, Mercury upper crankshaft seal, Mercury lower crankshaft seal, Johnson crankshaft oil seal, Evinrude crankshaft oil seal, Johnson Evinrude upper crank seal, Johnson Evinrude lower crank seal, Mercury Mariner outboard oil seal, Mercury 2 stroke crankshaft seal, Mercury 2.5L V6 crankshaft seal, Mercury 150 HP crankshaft seal, Mercury 175 HP crankshaft seal, Mercury 200 HP crankshaft seal, Mercury SportJet crankshaft seal, Mercury powerhead oil seal, outboard crankcase seal, Pro Marine 230 crankshaft seal

Item#:

41953-OE

Cross Reference#:

0313992
0764337
0777914
18-2016
20079
25837
29476
313992
336232
41953
41953B
508514
764337
775423
777914
9-76100

Manufacturer Item:

41953

Manufacturer:

Mercury Marine

Available:

In Stock

17.4900

Your Price:

14.72

Each

Qty:

Yamaha F75-F115 Intake Valve Stem Seal Pro Marine A3721

Aftermarket Intake Valve Seal | Replaces Yamaha K0A-A3721-00-00

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.

Aftermarket Replacement for Yamaha OEM

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

Fitment Note

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

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

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.

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