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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 V6 260, 280hp For Sleeved Hole
Item#:
W25K-SH
Manufacturer:
Mercury Marine
Available:
In Stock
Your Price:
2200.00
Each
Yamaha V4 - V6 90Deg 1984-88 Bore Size 3.564
Item#:
3936
Cross Reference#:
18-3936
6E5-11610-21-00
6E5-11610-22-00
6E5-11610-23-00
6J9-11610-20-00
6K7-11610-20-00
6K7-11610-21-00
Manufacturer Item:
6E5-11610-23-00
Manufacturer:
Sierra
Available:
In Stock
Your Price:
8.54
Each
Pro Marine 3937 Ring Kit for Yamaha 2-Stroke Outboards

Pro Marine Yamaha Piston Ring Kit

Yamaha 115-250HP Standard Piston Ring Kit

The Pro Marine 3937 Standard Piston Ring Kit is a premium aftermarket replacement for a wide range of Yamaha 2-stroke outboards. Designed for standard bore applications, this ring kit replaces several Yamaha OEM piston ring assemblies and is commonly used during powerhead rebuilds, piston replacement, compression repairs, and complete engine overhauls.

Pro Marine piston rings are manufactured to meet or exceed OEM specifications for fit, durability, and performance. This kit replaces Yamaha OEM numbers 6K7-11601-02-00, 6R5-11603-00-00, 64D-11603-00-00, 64D-11603-01-00, and 64D-11603-02-00.

Compatible Applications

Based on Yamaha OEM supersessions and application data, this piston ring kit is commonly found in many Yamaha V4 and V6 carbureted, EFI, Saltwater Series, ProV, Excel, and OX66 outboards using the OEM numbers listed above.

Manufacturer Models Years
Yamaha 115HP 2-Stroke Various Applications
Yamaha 130HP 2-Stroke Various Applications
Yamaha 150HP 2-Stroke Various Applications
Yamaha 175HP 2-Stroke Various Applications
Yamaha 200HP 2-Stroke Various Applications
Yamaha 225HP 2-Stroke Various Applications
Yamaha 250HP 2-Stroke Various Applications
Important Fitment Note:

Yamaha used multiple piston and ring configurations across engines with similar horsepower ratings. Always verify your original Yamaha OEM piston ring number before ordering.

This kit replaces OEM numbers 6K7-11601-02-00, 6R5-11603-00-00, 64D-11603-00-00, 64D-11603-01-00, and 64D-11603-02-00.

OEM & Cross Reference Numbers

Type Part Number
Pro Marine 3937
Yamaha OEM 6K7-11601-02-00
Yamaha OEM 6R5-11603-00-00
Yamaha OEM 64D-11603-00-00
Yamaha OEM 64D-11603-01-00
Current Yamaha OEM 64D-11603-02-00
Sierra 18-39320

Product Specifications

  • Brand: Pro Marine
  • Part Number: 3937
  • Part Type: Piston Ring Kit
  • Size: Standard Bore
  • Bore Diameter: 3.544"
  • Engine Type: Yamaha 2-Stroke Outboards
  • Application: Standard Bore Rebuilds and Piston Service

Alternative Brand Available

GLM 3937GM Standard Piston Ring Kit

Looking for the GLM version? We also stock the GLM 3937GM Standard Piston Ring Kit which fits the same Yamaha applications and OEM cross references.

View GLM 3937GM Ring Kit

What This Part Is Used For

Piston rings play a critical role in maintaining cylinder compression, controlling combustion chamber sealing, and transferring heat from the piston to the cylinder wall. During engine rebuilds, replacing worn piston rings is essential for restoring proper compression and performance.

This standard bore ring kit is intended for engines that remain within factory bore specifications and do not require oversized pistons or rings.

Key Features & Benefits

  • Pro Marine premium aftermarket piston ring kit
  • Standard bore replacement
  • 3.544" bore size
  • Replaces multiple Yamaha OEM piston ring assemblies
  • Ideal for powerhead rebuilds and piston replacement
  • Manufactured to OEM specifications
  • GLM alternative available and linked above

FAQ

Is this a standard size ring kit?
Yes. Part number 3937 is a standard bore piston ring kit.

What Yamaha OEM numbers does this replace?
It replaces 6K7-11601-02-00, 6R5-11603-00-00, 64D-11603-00-00, 64D-11603-01-00, and 64D-11603-02-00.

Can I use this on an oversized piston?
No. This is a standard-size ring kit. Oversized pistons require matching oversized rings.

Do you carry another brand?
Yes. We also stock the GLM 3937GM version linked above.

Should I replace rings during a rebuild?
Yes. Replacing piston rings is considered standard practice during most powerhead rebuilds and piston service procedures.

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 orders over $100 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 accepted within 30 days of delivery.
  • Parts must be new, unused, and in original packaging.
  • Installed internal engine parts are not returnable.
  • Return authorization is required before sending items back.

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


Searchable Terms

3937, 3937GM, Yamaha piston ring kit, Yamaha standard ring kit, Yamaha 115 piston rings, Yamaha 130 piston rings, Yamaha 150 piston rings, Yamaha 175 piston rings, Yamaha 200 piston rings, Yamaha 225 piston rings, Yamaha 250 piston rings, Yamaha V4 piston rings, Yamaha V6 piston rings, Yamaha powerhead rebuild, 6K7-11601-02-00, 6R5-11603-00-00, 64D-11603-00-00, 64D-11603-01-00, 64D-11603-02-00, 18-39320, Pro Marine 3937, GLM 3937GM

Item#:
3937
Cross Reference#:
18-39320
6K7-11601-02-00
6R5-11603-00-00
64D-11603-00-00
64D-11603-01-00
64D-11603-02-00
Manufacturer Item:
6R5-11603-00-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
28.95
Each
Yamaha V4 - V6 90Deg 1984-88 Bore Size 3.544
Item#:
3934
Cross Reference#:
18-3934
6E5-11610-00-00
6E5-11610-01-00
6E5-11610-02-00
6E5-11610-03-00
6J9-11610-00-00
6K7-11610-00-00
6K7-11610-01-00
6K7-11610-03-00
Manufacturer Item:
6E5-11610-03-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
22.61
Each
Yamaha V4 V6 1989-Up Bore Size 3.564
Item#:
3938
Cross Reference#:
6K7-11601-22-00
6R5-11605-00-00
64D-11605-00-00
64D-11605-01-00
64D-11605-02-00
Manufacturer Item:
6R5-11605-00-00
Manufacturer:
Pro Marine
Available:
Out of Stock
ETA:
11/10/2026
Your Price:
21.29
Each
Yamaha V4 V6 1989-Up Bore Size 3.584
Item#:
3939
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
28.95
Each
Mercury Inline 40-60hp Bore Size 2.905
Item#:
3930
Cross Reference#:
18-3917
18-3917
509406
88392
88392A12
Manufacturer Item:
88392A12
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
21.58
Set
Mercury Inline 20-60hp Bore Size 2.565
Item#:
3903
Cross Reference#:
18-3903
27841
27841A12
Manufacturer Item:
27841A12
Manufacturer:
Mercury Marine
Available:
In Stock
Your Price:
24.37
SET OF 3
Mercury 200-225 DFI 3.0L
Item#:
8592
Cross Reference#:
0769810
0775466
8M0024502
8M0027792
8M0204712
85089
850891
8508910
850892
8508920
850893
879194027
Manufacturer Item:
850892
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
17.59
Each
Mercury 2.0L 2 Keystone Rings Bore Size 3.140"
Item#:
934-2K15
Manufacturer:
Mercury Marine
Available:
Special Order
Your Price:
24.91
Each
Mercury 200-225 DFI 3.0L
Item#:
8582
Cross Reference#:
850282
Manufacturer Item:
850282
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
20.48
Each
Mercury 200-225 DFI 3.0L
Item#:
8583
Cross Reference#:
804680
850283
Manufacturer Item:
850283
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
16.79
Each
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