Wiseco PK1232 Top End Piston Kit with Gasket Set - 55.0mm 9.4 1

The Wiseco PK1232 is a complete top end piston kit featuring a 55.00mm bore and 9.4:1 compression ratio, designed as a 2.00mm oversize rebuild solution for compatible Honda XR/CRF100 engines. This kit gives you everything needed to complete a top end overhaul or overbore in a single package.

Kit Includes:

• Forged aluminum piston (55.00mm / 4666M)
• High-performance piston rings
• Alloy wrist pin
• Circlips
• Complete top end gasket set

Key Features:

• Forged aerospace-grade aluminum construction — Wiseco is the only U.S. aftermarket piston manufacturer to use an exclusively forged process, compressing the alloy's grain structure for superior strength, impact resistance, and fatigue life compared to cast alternatives
• Dedicated application-specific forging — optimized strength-to-weight ratio engineered for this exact engine displacement and design
• Engineered, forged, and machined in the USA — all forge tooling and manufacturing is handled in-house in Mentor, OH, allowing precise control from raw material to finished skirt coating
• Race-proven design — built from designs trusted by top race teams in Supercross, Motocross, GNCC, and Superbike competition
• Compatible with multiple cylinder bore compositions — suitable for cast iron, chrome, Nikasil, and boron composite cylinders

The PK-series kit from Wiseco simplifies your rebuild by bundling a premium forged piston with a matched top end gasket kit, eliminating the need to source components separately. Wiseco's in-house dyno testing and finite element modeling ensure each piston delivers the ideal balance of performance and long-term durability for 4-stroke powersports engines.