Wiseco PK1355 96mm 11.5:1 Forged Piston Top End Kit for Honda CRF450R

The Wiseco PK1355 is a complete forged piston top end kit designed for the 2002–2003 Honda CRF450R. Featuring a 96.00mm bore diameter and 11.5:1 compression ratio (Wiseco forging code 4753M), this kit delivers the performance and durability demanded by serious motocross and off-road racers.

Kit Includes:

• Forged aerospace-alloy piston — CNC machined from high-silicon, low-expansion aluminum for superior strength, reduced weight, and improved heat transfer
• High-performance piston ring set — precision-fit rings engineered for extended service life and sustained power output; Wiseco rings are compatible only with Wiseco pistons
• Alloy wrist pin — lightweight, precision-machined for consistent fit and long-term durability
• Circlips — included for complete, ready-to-install assembly
• Top-end gasket kit — manufactured from premium materials to meet or exceed OEM sealing standards
• Top-end needle bearing — precision-machined for reduced friction and reliable performance at high RPM

The piston dome geometry is optimized for ideal quench during the compression and combustion cycle, promoting resistance to detonation and pre-ignition for increased horsepower potential and longer engine life. Wiseco's dedicated forging process and CNC machining ensure exact tolerances and a superior strength-to-weight ratio that has made these kits the choice of top race teams across supercross, motocross, and GNCC competition.

The Wiseco PK1355 top end piston kit provides everything needed for a complete top-end engine rebuild on the 2002–2003 Honda CRF450R.