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6E5-11610-21-00
6E5-11610-22-00
6E5-11610-23-00
6J9-11610-20-00
6K7-11610-20-00
6K7-11610-21-00
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 |
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.
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.
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
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6K7-11601-02-00
6R5-11603-00-00
64D-11603-00-00
64D-11603-01-00
64D-11603-02-00
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
6R5-11605-00-00
64D-11605-00-00
64D-11605-01-00
64D-11605-02-00
6H4-11610-20-00
68F-11603-01-00
68F-11603-02-00
68F-11605-01-00
68F-11605-02-00
18-3963
18-3963
6K5-11601-02-00
9-54804
9-54804