Wiseco Pistons PK1198 Top End Piston Kit for Yamaha YZ250 66.4mm

The Wiseco Pistons PK1198 is a complete top end piston kit engineered for 2002-2010 Yamaha YZ250 two-stroke motocross bikes with a 66.4mm bore size. This kit provides everything needed for a complete top end rebuild, combining Wiseco's race-proven piston technology with premium gaskets and components.

Complete Top End Kit Includes:

• Dedicated forging piston manufactured from aerospace-grade aluminum alloy for superior strength-to-weight ratio
• High-performance ring set engineered for extended life and sustained power delivery
• Premium quality wrist pin designed for consistency and durability
• Top end needle bearing precision machined from highest quality materials for reduced friction
• Complete Wiseco top end gasket kit with premium sealing materials that exceed OEM standards

Performance Features:

• CNC machined for precise tolerances and optimal performance
• Optimized cam shape and ring groove profile for peak horsepower and extended service life
• Race-proven design trusted by professional race teams across all forms of motorcycle competition
• Advanced forging process ensures consistent quality and reliability under extreme conditions

Wiseco is the premier choice for two-stroke piston kits, offering professional-grade performance and durability for both competitive racing and aggressive recreational riding. This kit provides OEM fit with enhanced performance characteristics.