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63D-11181-A1-00
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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
6L2-W0001-00-00
6L2-W0001-01-00
6L2-W0001-02-00
68F-11642-01-85
68F-11631-01-85
