Wiseco PK1431 Yamaha YFM660 Raptor 9.91 CR (4966M10000) Piston Kit

The Wiseco team has remained at the forefront of powersports performance through every era and evolution, including the development of high-performance 4-strokes. Today, Wisecos forged 4-stroke pistons are designed for each specific engine application and built to the tightest tolerances for the ultimate combination of performance and strength. Proven at every level of riding, Wiseco 4-stroke pistons are ready to deliver the power and reliability youre looking for.

• Engineered, forged, and machined in the USA in Mentor, OH
• Designed and built for each specific 4-stroke powersports engine
• Improved tensile strength of forged material optimizes strength and service life
• Dedicated forgings allow for optimized strength-to-weight ratio
• Includes high-quality piston rings, wrist pin(s), and circlips