Wiseco Pistons PK1436 High-Performance Piston Kit for Yamaha Grizzly/Rhino 660 9.9:1 100.50mm

The Wiseco PK1436 is a premium forged piston kit engineered for Yamaha Grizzly and Rhino 660 ATVs and side-by-sides. This complete top-end rebuild kit features a 100.50mm oversized bore piston with a 9.9:1 compression ratio, ideal for restoring performance or building a reliable high-performance engine.

Key Features:

• 100.50mm bore size with 9.9:1 compression ratio for optimized power delivery
• Complete piston kit includes forged piston, rings, wrist pin, circlips, and top-end gasket set
• Forged aluminum construction with condensed grain structure for superior strength and durability
• Advanced skirt coating reduces friction and wear for extended service life
• Precision-machined ring grooves and pin bore for optimal seal and reliability
• Includes all necessary gaskets for complete top-end rebuild

Wiseco pistons are 100% forged in-house in the USA with complete control over materials, tooling, and manufacturing processes. Unlike brittle cast pistons, Wiseco's forging process creates aligned grain structure that delivers higher mechanical properties, superior impact resistance, and exceptional fatigue life. Each piston is designed with an optimized strength-to-weight ratio to maximize performance under demanding conditions. Backed by extensive dyno testing and race-proven engineering, Wiseco pistons are trusted by professional riders and enthusiasts worldwide.