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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

 

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.

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Mercury 2.0L Top Guided Bore 3.140
Item#:
4015SV
Cross Reference#:
7443A11
Manufacturer Item:
7443A11
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
108.12
Each
Mercury 2.4L Sleeved Hole Steel Bore Size 3.375
Item#:
V2100P-SH
Manufacturer:
Mercury Marine
Available:
Special Order
Your Price:
113.94
Each
This item is discontinued
Mercury 280 2.5L EFI Race round hole at bottom
Item#:
2706-1
Cross Reference#:
10-2706
8475252
Manufacturer Item:
8475252
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
32.55
Each
Replaces Mercury 804529  Fits Injectors 840481 & 804528

Fits Mercury 75-250 HP DFI Outboards

Compatible with select Mercury 75-250 HP DFI outboard engines using injector #840481 and #804528. The Pro Marine 20-3071B Fuel Injector O-Ring is a replacement injector seal designed to maintain a proper seal around the fuel injector. It is associated with Manufacturer Item 804529 and is commonly searched by that number when replacing worn injector seals during fuel system service.


Compatibility

This injector O-ring is used on many Mercury DFI / Optimax outboards from 75 HP up to 250 HP. It is associated with OEM reference number 804529 and commonly used with fuel injectors 840481 and 804528.

Application Chart

Mercury Optimax / DFI  75 HP
Mercury Optimax / DFI  90 HP
Mercury Optimax / DFI  115 HP
Mercury Optimax / DFI  135 HP
Mercury Optimax / DFI  150 HP
Mercury Optimax / DFI  175 HP
Mercury Optimax / DFI  200 HP
Mercury Optimax / DFI  225 HP
Mercury Optimax / DFI  250 HP

Always confirm compatibility using your engine model, serial number, injector number, or existing part number before ordering.


Part Numbers & Cross References

Reference Type Part Number
Pro Marine Part 20-3071B
Manufacturer Item 804529
Cross Reference # 804529
Fits Injector # 840481
Fits Injector # 804528

What This Part Is Used For

Fuel injector O-rings help seal the injector properly when installed in the fuel rail or intake system. If an injector is removed for cleaning, inspection, or replacement, installing a new O-ring helps ensure the system seals correctly when reassembled.

Over time these seals can flatten, harden, or become damaged due to heat and fuel exposure. Replacing them during injector service helps prevent sealing issues and keeps fuel system maintenance reliable.


Frequently Asked Questions

What engines does this O-ring fit?
This part is listed for Mercury 75-250 HP DFI outboards and fits injector numbers 840481 and 804528.

What OEM number is associated with this part?
The product page lists both Manufacturer Item 804529 and Cross Reference #804529.

When should I replace a fuel injector O-ring?
Injector O-rings are commonly replaced anytime injectors are removed for cleaning, inspection, or replacement.

Is this an OEM Mercury part?
This listing is an aftermarket replacement part from Pro Marine associated with Mercury reference number 804529.


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.

Apply for a Dealer Account

Shipping Policy

  • Free shipping on qualifying orders over $100 (continental U.S.).
  • Orders ship via UPS, USPS, or FedEx.
  • Orders received before 5:30 PM EST ship the same business day.
  • Typical ground delivery time is 15 business days.

30-Day Return Policy

  • Returns accepted within 30 days of delivery.
  • Items must be new, unused, and in original packaging.
  • Return authorization is required before sending items back.

Need help with a return or order question?
Contact Us
Phone: 941-721-3000


Searchable Part Numbers

Pro Marine Part: 20-3071B
Manufacturer Item: 804529
Cross Reference #: 804529
Fits Injector #: 840481, 804528
Common Search Terms: 20-3071B fuel injector o-ring, Mercury 804529, Mercury injector o-ring 804529, injector 840481 seal, injector 804528 o-ring

Item#:
20-3071B
Cross Reference#:
804529
Manufacturer Item:
804529
Manufacturer:
Mercury Marine
Available:
In Stock
Your Price:
4.04
Each
Verado 250-300hp
Item#:
24564P
Cross Reference#:
8M0024564
8M0024564
8M0033476
880552007
880552007
895374
895374
895374002
895374006
Manufacturer Item:
8M0033476
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
125.87
Each
Yamaha 2cyl 55hp, 3cyl 75-90hp Bore Size 3.248
Item#:
3120
Cross Reference#:
18-4099
6H1-11636-03-00
688-11636-02-00
9-53817
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
88.53
Each
Yamaha 2cyl 55hp, 3cyl 75-90hp Bore Size 3.228 STD.
Item#:
3100
Cross Reference#:
18-4097
6H1-11631-03-95
688-11631-02-95
9-53815
Manufacturer Item:
6H1-11631-03-95
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
92.45
Each
Mercury 15/25hp
Item#:
18-0336
Cross Reference#:
FI151549
FI5537304
F700553
F700554
32780
32880
41670
41670006
416702
416703
416704
416705
803620
815504220
85111
882355
Manufacturer Item:
416705
Manufacturer:
Sierra
Available:
In Stock
Your Price:
17.99
Each
Mercury 2.4L Sleeved Hole Bore Size 3.375
Item#:
2100P-SH
Cross Reference#:
8667A22
8667A42
8667T42
Manufacturer Item:
8667T42
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
111.50
Each
Yamaha V6 150-225hp 6G5-11181-A0-00
Item#:
3894-1
Cross Reference#:
6G5-11181-A0-00
6G5-11181-A1-00
6G5-11181-A2-00
6G5-11181-A3-00
6G5-11181-00-00
6G5-11181-01-00
Manufacturer Item:
6G5-11181-01-00
Manufacturer:
Yamaha Outboard
Available:
In Stock
Your Price:
62.99
Each
SportJet 120XR 1996-2000
Item#:
2875-2
Cross Reference#:
809817A1
Manufacturer Item:
809817A1
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
137.70
Each
Mercury 2.4L Bore 3.375 Chrome Bore
Item#:
3102SS
Cross Reference#:
14320
18-4555
8666A22
8666A42
8666T42
9-53220
Manufacturer Item:
8666T42
Manufacturer:
Wiseco
Available:
In Stock
Your Price:
179.72
Each
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