Wiseco Yamaha YFM660 Grizzly/Rhino 9.91 (4966M10200) Piston Kit
Premium materials produce the best sealing technology available exceeding O.E.M. standards. 2-Stroke: Wiseco top end gasket kit; Dedicated forging; Superior strength/weight ratio utilizing Aerospace alloy; Race-proven designs; Chosen by top race teams, in all forms of racing; CNC machined; Optimal cam shape and profile for peak HP and service life; Premium top end needle bearing; Precision-machined, highest-quality materials for strength and reduced friction; High-performance ring set; Extended life and sustained power; Highest-quality alloy pin; Consistently true and durable. 4-Stroke: Wiseco top end gasket kit; Premium materials produce the best sealing technology available, exceeding O.E.M. standards; Dedicated forging; Superior strength/weight ratio utilizing Aerospace alloy; Dome design; Improved flame travel; Chrome plated piston pin; Horizontal slot pin oiling; Reduced friction/scuff resistant; Pressure seal groove; Maximum ring seal; Armor Glide Skirt-Coated available for select models; Dedicated Rings; Maximum compression and oil control.
- Improved tensile strength of forged material optimizes strength and service life
- Designed and built for each specific 4-stroke powersports engine
- Dedicated forgings allow for optimized strength-to-weight ratio
- Includes high-quality piston rings, wrist pin(s), and circlips
- Engineered, forged, and machined in the USA in Mentor, OH
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2008 | Yamaha | YFM660F Grizzly 4x4 | Base |
| 2005-2007 | Yamaha | YXR66F Rhino 660 | Base |
| 2007 | Yamaha | YXR66F Rhino 660 Ducks Unlimited | Base |
| 2006-2007 | Yamaha | YXR66F Rhino 660 Exploring Edition | Base |
| 2006-2007 | Yamaha | YXR66F Rhino 660 Special Edition | Base |
| 2007 | Yamaha | YXR66F Rhino 660 Sport Edition | Base |
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