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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.
0777837
13150
18-3561
436195
775-100
777837
8M0175328
8M6010304
878904
9-43023
0583298
0583740
0777664
18-5170
583040
583298
583740
777664
879614
9-23104
329419
765012
9-63830
688-11181-A1-00
688-11181-A2-00
688-11181-01-00
688-11181-02-00
11141-95502
11141-95502
11141-95503
11141-95503
11141-95504
11141-95505
11141-95505-H17
11141-95600
11141-95600-H17
11141-95610
11141-95611
11141-95612
11141-95620
11141-95621
18-3814
36260
36270
63D-11181-A1-00
63D-11181-A2-00
695-11181-A1-00
695-11181-00-00
0392988
0765619
390436
392988
765619
GLM Yamaha Piston Ring Kit
Yamaha 115-250HP Standard Piston Ring Kit
The GLM 3937GM Standard Piston Ring Kit is an aftermarket replacement ring set designed for a wide range of Yamaha 2-stroke outboards. This standard bore ring kit replaces several Yamaha OEM piston ring assemblies and is commonly used during powerhead rebuilds, piston replacement, compression restoration, and complete engine overhauls.
This GLM ring 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 ring kit is commonly used on Yamaha V4 and V6 2-stroke outboards including many carbureted, EFI, Saltwater Series, ProV, Excel, and OX66 models that utilize 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 |
Yamaha used multiple piston and ring designs across engines with similar horsepower ratings. Always verify your original Yamaha OEM 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 |
|---|---|
| GLM Part Number | 3937GM |
| 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: GLM Marine
- Part Number: 3937GM
- 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
Prefer Pro Marine?
Pro Marine 3937 Standard Piston Ring Kit
Looking for the Pro Marine version? We also stock the Pro Marine 3937 Standard Piston Ring Kit for the same Yamaha applications and OEM cross references.
What This Part Is Used For
Piston rings seal combustion pressure, help transfer heat from the piston to the cylinder wall, and maintain proper compression. Replacing worn rings during a rebuild helps restore engine performance and reliability.
This standard-size ring kit is intended for engines that remain within factory bore specifications and do not require oversized pistons or rings.
Key Features & Benefits
- GLM Marine 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
- Pro Marine alternative linked above
FAQ
Is this a standard size ring kit?
Yes. Part number 3937GM 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 a Pro Marine version?
Yes. The Pro Marine 3937 version is linked above.
Should I replace rings during a rebuild?
Yes. Replacing piston rings is 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.
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.
Searchable Terms
3937GM, GLM 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, 6K7-11601-02-00, 6R5-11603-00-00, 64D-11603-00-00, 64D-11603-01-00, 64D-11603-02-00, 18-39320, GLM Marine, Pro Marine 3937
6K7-11601-02-00
6R5-11603-00-00
64D-11603-00-00
64D-11603-01-00
64D-11603-02-00
XL700 02-04/GP800 02-05
XLT800 02-04/GP1300 03-08
Yamaha Outboard
50-225 4 Stroke
150-300 HPDI
Tohatsu
8-50hp 2002-2022
Mercury
8-225 Efi 4 Stroke
3H8760400M
5041087
5214
68N-81940-00-00
68V-8194A-00-00
8M0098898
81940
825096
825096T
84932M
853809001
881352T
95642M
96356M