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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.
812876
877541
812876
47270
8M0214934
827663A1
5041643
67483
9225036412
9225036412M
922526412
922526412M
Vertex Yamaha / Mercury 4-Stroke .020 Oversize Piston Kit
Yamaha F90-F115 & Mercury 115 EFI Vertex .020 Oversize Piston Kit - 24228050
The Vertex 24228050 Piston Kit is a .020 oversize / .50mm oversize piston for select Yamaha four-stroke and Mercury 115HP EFI outboards.
Verified engine families include extensive Yamaha F115 and LF115 applications, select Yamaha F75 and F90 engines, and select Mercury 115HP EFI four-stroke outboards.
This piston is part of the same engine family as Yamaha 60C-W1164 and 68V-W1164 piston assemblies and Mercury 880895 piston assemblies.
This is NOT a standard-size piston.
The cylinder must be accurately measured and properly machined for the .020 / .50mm oversize piston before installation.
Do not install this piston into a standard 79.00mm bore.
Piston Size & Application
| Specification | Details |
|---|---|
| Brand | Vertex |
| Part Number | 24228050 |
| Piston Size | .020 Oversize |
| Metric Oversize | .50mm Oversize |
| Nominal Diameter | 79.5mm |
| Standard Bore Reference | 79.00mm |
OEM & Cross Reference Piston Family
| Brand / Type | Part Number |
|---|---|
| Vertex | 24228050 |
| Yamaha OEM Family | 60C-W1164-00-00 |
| Yamaha OEM Family | 60C-W1164-01-00 |
| Yamaha OEM Family | 68V-W1164-00-00 |
| Yamaha OEM Family | 68V-W1164-01-00 |
| Yamaha OEM Family | 68V-W1164-02-00 |
| Mercury OEM Family | 880895A05 |
| Mercury OEM Family | 880895A14 |
| Mercury OEM Family | 880895T1 |
Yamaha Outboard Fitment
| Engine Family | Verified Applications |
|---|---|
| Yamaha F75 | F75TLRB - 2003 and F75TLRC - 2004. |
| Yamaha F90 | F90TJRB / F90TLRB - 2003 and F90TJRC / F90TLRC - 2004. |
| Yamaha F115 - Early Models | F115TLRY / F115TXRY - 2000, F115TLRZ / F115TXRZ - 2001, F115TJRA / F115TLRA / F115TXRA - 2002, F115TJRB / F115TLRB / F115TXRB - 2003, F115TJRC / F115TLRC / F115TXRC - 2004, and F115TJRD / F115TLRD / F115TXRD - 2005. |
| Yamaha F115 - Later Models | F115JA, F115LA, F115TJR, F115TLR, F115TXR and F115XA, including the supplied 04, 011, 061 and 0405-0411 suffix variants. |
| Yamaha LF115 | LF115TXRY - 2000, LF115TXRZ - 2001, LF115TXRA - 2002, LF115TXRB - 2003, LF115TXRC - 2004, LF115TXRD - 2005, plus later LF115TXR and LF115XA applications. |
Mercury 115HP EFI Fitment
| Engine | Serial Number Range |
|---|---|
| Mercury 115HP EFI | 0T178500 thru 0T800999 |
| Mercury 115HP EFI | 0T801000 thru 1B226999 |
| Mercury 115HP EFI | 1B227000 thru 1B366822 |
Oversize piston selection should be based on actual cylinder measurements, not only on the condition of the original piston.
Measure bore diameter, taper and out-of-round condition before machining. The cylinder should then be finished to the piston manufacturer's required piston-to-wall clearance.
Other Piston Options
Vertex Standard Piston - 24228STD
Size: 79.00mm Standard
Standard Vertex piston for compatible cylinders that remain within factory bore-size limits.
First OEM: 68V-W1164-02-00
View Vertex Standard Piston
Vertex .010 Oversize Piston - 24228025
Size: .010 / .25mm Oversize
Intermediate oversize Vertex option for cylinders that can be finished at .010 oversize.
First OEM Reference: 60C-W1164-10-00
View Vertex .010 Piston
Wiseco Standard Piston - 3207PS
Size: 79.00mm Standard
Alternate standard-size Wiseco piston for compatible Yamaha F115 and Mercury 115 EFI engine rebuilds.
View Wiseco Standard Piston
Wiseco .020 Oversize Piston - 3207P2
Size: 79.5mm / .020 Oversize
Alternate .020 oversize Wiseco option for cylinders properly machined to the required finished bore.
View Wiseco .020 PistonYamaha OEM Piston Ring Options
Yamaha OEM Standard Ring Kit - 11605
Size: Standard 79mm
First OEM: 6D8-11603-00-00
OEM standard ring option for compatible standard-size 79mm pistons.
View Standard OEM Rings
Yamaha OEM .25mm Oversize Ring Kit - 11606
Size: .25mm / approximately .010 Oversize
First OEM: 6D8-11604-00-00
OEM ring option for the corresponding Yamaha .25mm oversize piston configuration.
View .25mm OEM RingsReplacement Cylinder Sleeves
If cylinder damage cannot be corrected with a .020 overbore, replacement cylinder sleeves may be required.
Advanced Sleeve 1185SC
Straight 4-stroke cylinder sleeve for compatible engine rebuilding.
Verify sleeve dimensions, block bore and finished cylinder requirements before machining.
View 1185SC Sleeve
Advanced Sleeve 1185SA
Alternate replacement cylinder sleeve option for compatible Yamaha / Mercury four-stroke engine rebuilds.
Compare sleeve dimensions with the block before installation.
View 1185SA SleeveMain & Connecting Rod Bearings
Pro Marine Main Bearing Set - 4CYLSSMAIN
Complete one-size crankshaft main bearing set for compatible Yamaha four-cylinder engines.
First OEM Reference: 6D8-11416-00-00
Eliminates Yamaha bearing color-code selection and Plastigauge sizing.
View Main Bearing Set
Pro Marine F115 Rod Bearing Set - 4CYLSSROD
Complete one-size connecting rod bearing set for compatible Yamaha F115 applications.
First OEM Reference: 68V-11656-00-00
Eliminates the factory Yamaha bearing color selection process.
View Rod Bearing SetComplete Powerhead Gasket Kit
Pro Marine Powerhead Gasket Kit - 6803
Complete gasket kit for compatible Yamaha F75-F115 powerhead rebuilds.
Recommended when the engine is disassembled for piston replacement, cylinder machining, bearing service or a complete powerhead rebuild.
OEM Families: 6D8-W0001, 67F-W0001 and 68V-W0001
Piston Size Guide
| Finished Cylinder Size | Piston Options |
|---|---|
| 79.00mm Standard | Vertex 24228STD or Wiseco 3207PS |
| .010 / .25mm Oversize | Vertex 24228025 |
| .020 / .50mm Oversize | Vertex 24228050 or Wiseco 3207P2 |
| Cylinder Requires Sleeving | Inspect 1185SA / 1185SC replacement sleeve options and machine the finished cylinder to suit the selected piston. |
Shop Yamaha Engine Rebuild Parts by Model
Find additional pistons, rings, bearings, valves, gaskets, sleeves and related internal engine components in Pro Marine's Yamaha Engine Rebuild Parts by Model section.
Shop Yamaha Engine Rebuild Parts by Model
When to Use a .020 Oversize Piston
A .020 oversize piston is used when cylinder wear, scoring or damage requires enough machining that the cylinder can no longer remain at standard size or .010 oversize.
Before machining, accurately measure cylinder diameter, taper and out-of-round. The finished bore must provide the correct piston-to-wall clearance for the Vertex piston.
When Should a Cylinder be Sleeved Instead?
If cylinder damage, corrosion or previous machining prevents the bore from being restored at .020 oversize, a replacement cylinder sleeve may be required.
The replacement sleeve is installed and then finished to the correct bore for whichever piston size will be used in the rebuilt engine.
Parts to Inspect During a Powerhead Rebuild
- Cylinder bore diameter
- Cylinder taper and out-of-round
- Piston-to-wall clearance
- Piston rings and ring end gap
- Connecting rods
- Connecting rod bolts
- Connecting rod bearings
- Crankshaft main bearings
- Crankshaft journals
- Cylinder head and valves
- Valve stem seals
- Oil passages and lubrication system
- Powerhead gaskets and seals
Key Features and Benefits
- Vertex oversize piston kit
- Vertex part number 24228050
- .020 / .50mm oversize
- 79.5mm nominal piston size
- Fits extensive Yamaha F115 and LF115 applications
- Fits select Yamaha F75 and F90 applications
- Fits select Mercury 115HP EFI engines
- Vertex standard piston linked above
- Vertex .010 oversize piston linked above
- Wiseco standard and .020 piston alternatives linked above
- Yamaha OEM ring options linked above
- Replacement cylinder sleeves linked above
- Main and connecting rod bearing sets linked above
- Complete powerhead gasket kit linked above
FAQ
What size is Vertex 24228050?
It is a .020 / .50mm oversize piston, approximately
79.5mm.
Is 24228050 a standard-size piston?
No. The standard Vertex piston is the
24228STD 79.00mm piston linked above.
Can I install this piston in a standard cylinder?
No. The cylinder must be properly bored and finished for the .020 oversize
piston.
Does this fit Yamaha F115?
Yes. The supplied engine fitment includes extensive Yamaha F115 and LF115
applications.
Does it fit Mercury 115 EFI?
Yes. Supplied Mercury fitment includes
0T178500 thru 0T800999,
0T801000 thru 1B226999, and
1B227000 thru 1B366822.
Do you have a .010 oversize piston?
Yes. The Vertex 24228025 is the .010 / .25mm oversize option.
Do you have another .020 piston option?
Yes. The Wiseco 3207P2 79.5mm piston is an alternate
.020 oversize option.
What standard pistons are available?
Pro Marine stocks both the Vertex 24228STD and
Wiseco 3207PS standard 79mm pistons.
Are replacement cylinder sleeves available?
Yes. Advanced Sleeve 1185SA and 1185SC options are linked above.
What main bearings are available?
The Pro Marine 4CYLSSMAIN main bearing set is linked above.
What connecting rod bearings are available?
The Pro Marine 4CYLSSROD connecting rod bearing set is linked above.
Is a complete powerhead gasket kit available?
Yes. The Pro Marine 6803 Powerhead Gasket Kit is linked above.
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 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 sending items back.
Need help with an order or return?
Contact Pro Marine
Phone: 941-721-3000
Searchable Terms
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16910-GB2-005
35-16248
369-02230-0
369-02230-1
369022300
369022300M
369022301
369022301M
5040140
8M0157133
