Wiseco Pistons PK1432 ATV Piston Kit 100.5mm Bore 9.9:1 Compression Yamaha YFM660

The Wiseco PK1432 is a high-performance forged piston kit designed for Yamaha YFM660 ATVs, featuring a 100.5mm bore diameter and 9.9:1 compression ratio. This complete kit includes a premium forged piston (model 4966M) and top-end gasket kit for a comprehensive rebuild solution.

Key Features:

• 100.5mm bore diameter with 9.9:1 compression ratio optimized for performance
• Forged aluminum construction for superior strength and durability
• Condensed grain structure aligned to part features for maximum impact and fatigue resistance
• Optimized strength-to-weight ratio for enhanced engine response
• Includes complete top-end gasket kit for installation
• Manufactured in-house in the USA with complete quality control
• Advanced skirt coating for reduced friction and wear

Wiseco forged pistons are engineered specifically for high-performance powersports applications where durability is critical. Unlike brittle cast pistons that can fail catastrophically under stress, Wiseco's forging process creates a dense grain structure that withstands extreme racing conditions and aggressive riding. Each piston is designed and tested in-house using dyno testing to ensure reliable performance in demanding ATV applications.