OS 1.00 OEM Direct Fit Piston Kit - Yamaha YFM 660 Grizzly Rhino
OS 1.00 OEM Direct Fit Piston Kit - Yamaha YFM 660 Grizzly Rhino is backordered and will ship as soon as it is back in stock.
Delivery and Shipping info
Delivery and Shipping info
- Standard delivery (2-4 working days) - £4.99 on eligible UK mainland orders under £50.
- Express delivery - £6.99 on eligible UK mainland orders placed before 2pm.
- Large equipment including international orders are subject to different delivery rates and timescales.
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OS 1.00 OEM Direct Fit Piston Kit - Yamaha YFM 660 Grizzly Rhino is backordered and will ship as soon as it is back in stock.
OS 1.00 OEM Direct Fit Piston Kit for Yamaha YFM 660 Grizzly, Rhino, and Raptor models from 2002 through 2007 is a purpose-built engine component designed to restore factory compression and dependable power. This aftermarket replacement delivers a cost-effective path to peak performance without sacrificing the tolerances required for long-term reliability. Built to align with Yamaha specifications, it provides a direct-fit solution that helps your trail or farm work run smoother, cooler, and more reliably crank after crank.
The OS 1.00 piston kit offers a clear value proposition for riders facing typical wear on these engines - declining compression, oil consumption, and throttle response slowdowns from worn piston rings and lands. By delivering a properly sized, durable aluminum piston with precise ring fit, this aftermarket option helps restore consistent power and reliable sealing in dusty, heavy-use conditions common on trails and in fields, all while keeping operating costs down.
What's Included
Includes the essential top-end components needed to rebuild the piston area on Yamaha YFM 660 engines:
- Piston
- Piston Rings
- Wrist Pin
- Circlips
*Gaskets and top-end seals are not included; use a separate top-end gasket kit for a complete rebuild.*
OEM & Aftermarket Cross-Reference Information
| Part Number | Brand / Type | Cross-Reference Notes |
|---|---|---|
| 2C6-11638-00-00 | Yamaha OEM | Direct cross-reference for YFM660 piston kit OS 1.00 |
| 3YF-11638-00-00 | Yamaha OEM | Direct cross-reference for YFM660 piston kit OS 1.00 |
Fitment
| Manufacturer | Models / Series | Years / Details |
|---|---|---|
| Yamaha | YFM 660 Grizzly | 2002 - 2007 |
| Yamaha | YFM 660 Rhino | 2002 - 2007 |
| Yamaha | YFM 660 Raptor | 2002 - 2007 |
Specifications
| Attribute | Details |
|---|---|
| OEM Reference Part Numbers | 2C6-11638-00-00, 3YF-11638-00-00 |
| Type | Piston Kit |
| Manufacturer | Aftermarket Replacement |
| Application | Yamaha YFM 660 Grizzly, Rhino, and Raptor (2002 - 2007) |
| Piston Size | OS 1.00 |
| Bore Size | STD 100mm |
| Material | Aluminum Alloy |
Installation Notes
- Inspect the cylinder bore for scoring or out-of-round wear; hone or bore as necessary before installing the kit.
- Verify the bore diameter and OS size match the kit’s specifications; ensure no debris or burrs remain in the cylinder.
- Lubricate the piston, rings, and wrist pin with assembly lubricant prior to assembly to prevent dry-start wear.
- Install the wrist pin and circlips securely; confirm circlips are fully seated and not protruding into the crankcase.
- Orient piston rings correctly and stagger ring gaps to optimize sealing; verify ring end gaps per manual guidelines.
- Follow the engine service manual for proper torque specs and break-in procedures to avoid glazing or ring set failure.
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