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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.
18-8622
270000510
270000612
270000633
270000669
270000688
270000882
270001011
270001077
270001099
5031400
11142-93J01
11142-93J02
11142-93J03
11142-93J10
5034854
5035971
5036630
11141-93J01
11141-93J02
11141-93J02
11141-93J03
11141-93J10
5034853
5035938
5036629
15410-93J01
5034984
15410-60C00
15410-87J10
18-7716
5030702
5032323
765573
6P2-12121-10-00
Pro Marine Forward Gear Roller Bearing for Mercury V6 Gearcases
The Pro Marine 549281P Forward Gear Roller Bearing is an aftermarket replacement for Mercury OEM number 549281. It fits select Mercury and Mariner V6 outboard gearcases, including standard-rotation, SportMaster, TorqueMaster, Pro Max, Super Mag, Magnum, XR and Jet applications.
Forward Gear Roller Bearing
This roller bearing supports the forward gear inside the outboard lower unit. It allows the gear to rotate smoothly while supporting the radial loads created by the gearset and propeller shaft.
Pro Marine item: 549281P
Mercury OEM number: 549281
Part type: Forward gear roller bearing
Location: Gear housing and propeller-shaft assembly
Why Choose the Pro Marine Replacement?
A Pro Marine replacement bearing supplied for professional marine lower-unit service and repair.
Replaces Mercury roller-bearing part number 549281 in the listed gearcase applications.
Fits select standard, SportMaster, TorqueMaster, Pro Max, Super Mag and related V6 gearcases.
Suitable for lower-unit rebuilding when inspection confirms the forward gear bearing requires replacement.
Provides an economical alternative for customers who do not require a genuine Mercury-branded bearing.
Pro Marine USA can assist with identifying the correct bearing using your engine serial number and gearcase type.
OEM & Cross Reference Numbers
| Brand | Part Number | Description |
|---|---|---|
| Pro Marine | 549281P | Aftermarket forward gear roller bearing |
| Mercury Marine | 549281 | OEM roller bearing |
Mercury and Mariner Fitment Overview
This bearing was used in several different Mercury and Mariner V6 lower-unit designs. General application groups are shown below, followed by detailed serial-number fitment.
| Engine Family | Common Gearcase Applications |
|---|---|
| 105 and 140 Jet | Select propeller-shaft gear housings and standard-rotation gearcases |
| 135-200HP V6 | Standard, Magnum, XR, XRI, Marathon, Work and offshore gearcases |
| 150-200HP Performance | Pro Max, Super Mag, SportMaster and TorqueMaster applications |
| 200HP XS | Select 2.5L six-cylinder standard, SportMaster and TorqueMaster gearcases |
| 225 and 225X EFI | Select Pro Max and Super Mag SportMaster and TorqueMaster gearcases |
| 2.5L Offshore and Racing | Select offshore, ROS and high-performance gear-housing assemblies |
Important Fitment Note
Mercury used multiple propeller-shaft gearcases, bearing arrangements, gear ratios and serial-number breaks within the same horsepower family.
Do not order this bearing based only on horsepower. Verify that the Mercury parts diagram for your complete engine serial number specifies bearing 549281.
Grouped Mercury Serial-Number Fitment
Applications sharing the same or closely related serial ranges are grouped together to make the fitment information easier to search and review.
| Engine Models | Serial Number Range | Gearcase / Catalog Notes |
|---|---|---|
| 2.5L Offshore | 0G857000 through 0T999519 | Standard-rotation propeller-shaft gear housing |
| 2.5L Offshore | 0G610239 through 0G856999 | Standard and SportMaster gear housing |
| V135, V150, V175 and V200 | 0C239553 through 0D081999 | Standard propeller-shaft gear housing |
| XR4, Magnum II | 0C239553 through 0D081999 | Standard V6 gear housing |
| V150 XR2, V150, V150 Magnum, Marathon, Work and V1500 | 4868998 or 5600162 through 0A904645 | Gear housing with driveshaft nut |
| V175 Magnum, V175 XRI and V200 XRI | 0D000750 or 0C291520 through 0D081999 | 1.87:1 and 2.0:1 propeller-shaft gear housings |
| 105 Jet, 140 Jet, V135, V150, XR6, Magnum III, V175 and V200 | 0D082000 through 0G303045 | Propeller-shaft gear housing |
| 105 Jet, 140 Jet, V135, V150, XR6, Magnum III, V175 and V200 | 0G303046 through 0G760299 | Standard prop-shaft gear housing; selected applications below serial 0G437999 |
| V150 HP, V175 SKI, V175 Magnum, V175 XRI and V200 XRI | 0D082000 through 0G303045 | 1.87:1 or 2:1 prop-shaft gear housing |
| V150 HP, V175 HP and V200 | 0G303046 through 0G760299 | Standard-rotation prop-shaft gearcase; selected applications below 0G437999 |
| 150 and 200 HP Pro Max / Super Mag | 0D935000 through 0G610049 or 0G610079 | Standard, SportMaster, TorqueMaster and CLE gearcases |
| 150 and 200 HP Pro Max / Super Mag | 0G610050 through 0G856999 | Canadian standard and SportMaster applications |
| 200 EFI Pro Max / Super Mag | 0G857000 through 0G858150 | Belgium SportMaster and TorqueMaster gearcases |
| 225 EFI Pro Max / Super Mag | 0G857000 through 0T429939 | Standard, SportMaster and TorqueMaster applications |
| 225 EFI Pro Max / Super Mag | 0G610104 through 0G856999 | Selected USA production applications |
| 200 HP XS 2.5L six-cylinder | 0T235000 through 0T818180 | SportMaster and TorqueMaster gearcases |
| 200 HP XS 2.5L six-cylinder | 0T818181 through 1E000796 | Standard, SportMaster and TorqueMaster gearcases |
| 200 HP XS 2.5L six-cylinder | 1E000797 through 1E002110 | Standard, SportMaster and TorqueMaster gearcases |
| 225X EFI Pro Max | 0T430254 through 0T819605 | SportMaster and TorqueMaster applications |
| V175 | 4301235 through 0C100860 or 8058870 through 0B384939 | 2:1 gear ratio with 14-tooth pinion gear; USA and Australian production |
Some ranges above include more than one gearcase design. Verify the gear-housing diagram and confirm that bearing 549281 appears in the parts list for your exact engine serial number.
What This Bearing Is Used For
The forward gear bearing supports the forward gear and helps maintain proper alignment between the gear, pinion and propeller shaft inside the lower unit.
A worn or damaged bearing may contribute to gearcase noise, excessive metal contamination, rough gear rotation, improper gear alignment or damage to the forward gear and related lower-unit components.
Lower-unit bearing replacement requires complete disassembly, inspection and correct setup of bearing preload, gear backlash and shim thickness. This repair should be performed using the applicable Mercury service procedures and proper specialty tools.
Frequently Asked Questions
Is this a Pro Marine product?
Yes. Item 549281P is a Pro Marine-branded aftermarket forward gear roller bearing.
Does it replace Mercury 549281?
Yes. Pro Marine 549281P is an aftermarket replacement for Mercury OEM roller bearing 549281.
Where is this bearing installed?
It is installed in the lower-unit gear housing and supports the forward gear in the propeller-shaft assembly.
Does it fit every Mercury 135-225HP V6?
No. Mercury used several different gearcase and bearing arrangements. Confirm OEM number 549281 using the complete engine serial number and gear-housing diagram.
Does it fit SportMaster and TorqueMaster gearcases?
It fits the specifically listed SportMaster and TorqueMaster applications that call for Mercury bearing 549281.
Can this bearing be replaced without resetting the gearcase?
Bearing replacement normally requires lower-unit disassembly, inspection and proper gearcase setup. Follow the correct Mercury service procedure for the exact gearcase.
The Pro Marine Advantage
Pro Marine supplies marine repair professionals, dealerships and boat owners with replacement lower-unit components for Mercury, Yamaha, Suzuki, Johnson, Evinrude and other leading marine brands.
Pro Marine replacement parts are selected to provide dependable fitment, practical value and reliable service for professional and do-it-yourself marine repairs.
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 ship via UPS, USPS and FedEx.
- 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 are accepted within 30 days of delivery.
- Parts must be new, unused and in their original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help confirming fitment or have an order question?
Contact Us
Phone: 941-721-3000
Searchable Part Numbers & Applications
Pro Marine 549281P, 549281P, 549281, Mercury forward gear bearing, Mercury roller bearing, Mercury lower unit bearing, Mercury V6 gearcase bearing, Mercury SportMaster bearing, Mercury TorqueMaster bearing, Mercury Pro Max gearcase bearing, Mercury Super Mag bearing, Mercury 105 Jet bearing, Mercury 140 Jet bearing, Mercury V135 bearing, Mercury V150 bearing, Mercury V175 bearing, Mercury V200 bearing, Mercury 200 XS bearing, Mercury 225 Pro Max bearing, Mercury 225X bearing, Mariner forward gear bearing