Wiseco Pistons PK1061 ATV Piston Kit Compression Yamaha - 100.5mm 11 1 YFM660

The Wiseco PK1061 Performance Piston Kit is engineered specifically for Yamaha YFM660 ATVs, delivering enhanced performance through precision-forged construction. This complete top-end kit features a 100.5mm bore piston with an 11:1 compression ratio and includes all necessary gaskets for a complete rebuild.

Key Features:

• 100.5mm bore diameter for optimal cylinder fitment
• 11:1 compression ratio for improved power and throttle response
• Forged aluminum construction for superior strength and durability
• Includes top-end gasket kit for complete installation
• Proprietary skirt coating reduces friction and wear
• Optimized grain structure aligned to piston geometry for maximum impact resistance
• Advanced forging process creates superior strength-to-weight ratio

Wiseco's in-house forging process ensures complete quality control from raw material to finished product. Unlike brittle cast pistons that can fail catastrophically under stress, Wiseco's forged pistons feature a condensed grain structure that provides exceptional resistance to fatigue and impact damage. Each piston is designed and tested to withstand the extreme demands of high-performance ATV applications, making this kit ideal for both performance rebuilds and racing applications.

This kit uses Wiseco piston part number 4737M and is manufactured in the USA with rigorous quality control standards.