Wiseco 578M05650 Dirt Bike Piston Kit 56.50mm 0.50mm Oversize

The Wiseco 578M05650 is a forged 2-stroke dirt bike piston with a 56.50mm bore diameter, representing a 0.50mm oversize for cylinder restoration or performance builds. Engineered for high-RPM two-stroke applications, this piston is manufactured from high-silicon, low-expansion aluminum alloy using Wiseco's dedicated forging process for superior strength, reduced weight, and improved heat transfer compared to cast alternatives.

Key Features:

• Bore Size: 56.50mm (0.50mm / +0.020" oversize)
• Forged Construction: High-silicon, low-expansion aluminum alloy for superior strength-to-weight ratio
• Diamond-Turned Finish: CNC computer-controlled turning ensures a precise, consistent finish with no size variation
• Complete Kit: Supplied with rings and circlips — ready to install
• Universal Cylinder Compatibility: Suitable for use in cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
• Oversize Availability: Designed to restore worn cylinders or accommodate re-sleeved bores
• Only Wiseco replacement ring sets should be used on Wiseco 2-stroke pistons
• Wrist pin is not included unless specifically noted

Wiseco has been manufacturing forged pistons for the powersports industry since 1941 and remains the only U.S.-based manufacturer of forged motorsports pistons. The 578M05650 is the choice of serious riders and race teams demanding reliable, performance-proven engine components.