Wiseco 486M05650 Forged 2-Stroke Dirt Bike Piston Kit 56.50mm Bore +0.50mm Oversize

The Wiseco 486M05650 is a high-performance forged piston kit featuring a 56.50mm bore (+0.50mm / .020" oversize), designed for 2-stroke dirt bike engines requiring a first oversize rebuild. Each kit includes the piston, rings, wrist pin, and circlips — everything needed for a complete top-end service.

Key Features:

• Forged high-silicon, low-expansion aluminum alloy construction delivers superior strength, reduced weight, improved heat transfer, and extended service life compared to cast alternatives
• +0.50mm oversize (56.50mm bore) — engineered for cylinders that have been bored or worn beyond standard dimensions; cylinder sleeving or replating is required for oversize fitment
• Diamond-turned finish produced on CNC computer-controlled turning centers ensures a precise, consistent bore size with no variation
• Compatible with all major cylinder bore compositions including cast iron, chrome, Nikasil, and boron composite
• Innovative piston skirt design optimized for maximum horsepower and torque output
• Kit includes: piston, rings, wrist pin, and circlips

Wiseco is the only U.S. manufacturer of forged pistons for the powersports market, producing all forge tooling and finished pistons in-house for complete quality control from raw material to final part. The 486M05650 is the trusted choice for racers and enthusiasts performing a top-end oversize rebuild on their 2-stroke dirt bike.