Wiseco 77mm Piston Kit for 1986-2004 Honda XR250R 4466M07700

If you're running an XR250R hard on the trail or track, your factory piston is likely the weakest link in your engine. This Wiseco kit replaces it with a high-silicon aluminum forging that handles aggressive riding, higher boost loads, and extended runtime without compromise. The 10.5:1 compression ratio unlocks measurable gains in power and throttle response while maintaining the reliability you need for remote riding.

Wiseco's CNC-machined Pro-Lite design optimizes ring dynamics and reduces friction, translating to faster acceleration and better fuel economy. Whether you're refreshing a tired engine or building a performance upgrade, this piston kit delivers the durability and precision expected from a market leader in high-performance pistons.

• High-silicon aluminum alloy
• CNC-machined Pro-Lite design
• 10.5:1 compression ratio
• 77mm bore diameter
• Fits XR250R (1986-2004)
• Fits XR250L (1991-1996)
• Increased horsepower
• Improved throttle response
• Enhanced durability
• Bolt-on replacement
• MPN: 4466M07700