Wiseco Pistons 40313M08100 Forged Piston Kit Bore Powersports - 81.00mm 2-Stroke

The Wiseco 40313M08100 is a forged powersports piston kit engineered for 2-stroke engines with an 81.00mm bore diameter. Designed and manufactured at Wiseco's facility in Mentor, Ohio, this piston kit delivers the strength, precision, and durability demanded by both competitive riders and serious enthusiasts.

Wiseco's forged piston construction offers a significant advantage over cast alternatives. The forging process produces a denser grain structure that is aligned to the features of the part, resulting in higher mechanical properties, superior impact resistance, and the ability to withstand the extreme heat and stress of high-performance 2-stroke engines.

Kit Includes:

• Forged 2-stroke piston — precision-machined to tight tolerances for the 81.00mm bore
• Piston rings — designed to create an optimal seal for efficient power transfer and reduced friction
• Wrist pin — manufactured to Wiseco's strict quality standards
• Circlips — for secure wrist pin retention

Key Features:

• Forged aluminum construction for superior strength-to-weight ratio over cast pistons
• 81.00mm bore size (standard/stock bore)
• CNC-machined for optimal cam shape and profile
• Race-ready dome finish with smooth edges for improved combustion flow
• Tight manufacturing tolerances for quiet operation and extended service life
• Engineered, forged, and machined in the USA

Wiseco has been at the forefront of performance piston manufacturing for over 80 years, and the 40313M08100 reflects that legacy of precision engineering. This complete piston kit provides everything needed for a top-end rebuild, making it a reliable choice for scheduled maintenance or performance upgrades.