Wiseco 337M07100 Forged Piston Kit Oversize - 2-Stroke 71.00mm 1.00mm

The Wiseco 337M07100 is a high-performance forged piston kit sized at 71.00mm bore (1.00mm oversize), purpose-built for 2-stroke powersports engines. Engineered, forged, and machined in the USA, this kit delivers the strength and precision required for serious off-road and racing applications where stock cast pistons simply fall short.

Wiseco pistons are forged from aerospace-grade aluminum alloy, a process that compresses the material's grain structure for superior density, impact resistance, and fatigue strength compared to conventional cast pistons. The result is a piston that bends before it breaks — a critical advantage in high-performance and race conditions where power and compression levels exceed OEM design limits.

Kit Includes:

• Forged high-silicon aluminum alloy piston
• Piston rings
• Wrist pin (piston pin)
• Circlips

Key Specifications:

• Bore Size: 71.00mm
• Oversize: 1.00mm over standard
• Engine Type: 2-Stroke
• Part Number: 337M07100

Important Notes:

• This is an oversize piston — cylinder boring or sleeving to the specified 71.00mm diameter is required prior to installation
• Wiseco rings and pistons are specifically engineered to work together and are not interchangeable with OEM components
• Always verify piston-to-wall clearance per the included specification card before final assembly

Wiseco is the only aftermarket piston manufacturer in the United States that produces pistons exclusively using the forging process — all forging tooling and manufacturing is performed in-house in Mentor, Ohio, ensuring complete quality control from raw material to finished part.