Wiseco 518M05550 Pro-Lite 55.50mm 2-Stroke Off-Road Piston Kit Honda CR125R

The Wiseco 518M05550 is a Pro-Lite forged piston kit sized at 55.50mm bore (1.50mm oversize), engineered for 2-stroke off-road performance applications including the Honda CR125R (1985–1986). Built to Wiseco's exacting standards, this piston delivers the strength, precision, and durability demanded by both competitive racers and serious off-road enthusiasts.

Key Features:

• Forged from high-silicon, low-expansion aerospace-grade aluminum alloy for superior strength, reduced weight, and improved heat transfer
• CNC machined to tight tolerances with a diamond-turned finish for consistent sizing and a perfect cylinder fit
• Computer-engineered piston skirt profile minimizes cylinder wall friction for increased power and throttle response
• Single-ring 2-stroke design optimized for maximum horsepower and torque output
• 1.50mm oversize — requires professional cylinder boring or sleeving prior to installation
• Complete kit includes piston, ring set, wrist pin, and circlips

Wiseco piston kits are the racer's choice for rebuilding 2-stroke engines. Each component is manufactured at Wiseco's state-of-the-art computerized facility and optimized specifically for your engine application. Cross-reference part numbers: 563P6, 518P60.