Wiseco 559M05800 58mm 2-Stroke Dirt Bike Piston Kit

The Wiseco 559M05800 is a 58mm bore 2-stroke piston kit designed for high-performance dirt bike applications. Wiseco pistons are forged from aerospace-grade aluminum alloy, offering superior strength, reduced weight, and excellent thermal resistance compared to cast alternatives — making them a trusted choice for both recreational riders and competitive racers.

Kit Includes:

• Forged 2-stroke piston (58mm / 2283" bore)
• Piston rings
• Circlips
• Note: Wrist pin is not included unless specifically noted

Key Features:

• Forged aluminum construction — stronger and lighter than OEM cast pistons
• 58mm bore diameter with a +2.00mm oversize for engine rebuild or re-bore applications
• 2-stroke specific design — engineered for the unique demands of 2-cycle dirt bike engines including port timing and thermal expansion rates
• Wiseco ring compatibility — only genuine Wiseco replacement ring sets should be used with this piston to ensure proper fit and performance
• Precision CNC machined for tight tolerances and consistent fitment

The 559M05800 is an ideal solution for engine rebuilds requiring an oversize bore, restoring compression and power output to worn or damaged cylinders. Always verify cylinder bore dimensions and surface finish before installation.