Wiseco Big Bore Piston Kit for Honda XR250R / XR250L (77.00mm)

Wiseco Big Bore Piston Kit (Part Number: 4466M07700) for Honda XR250R/XR250L, delivering 263cc displacement at 77.00mm bore with 10.5:1 compression ratio. Forged from aerospace-grade alloy and precision-machined in the USA for superior strength-to-weight characteristics. Complete kit includes high-performance ring set and alloy pin, eliminating multiple sourcing requirements. Features a horizontal slot-pin oiling design that reduces friction and enhances scuff resistance, complemented by a pressure-seal groove for optimal ring seating. The race-proven dome finish incorporates smooth combustion edges for improved flow dynamics. Four-stroke applications benefit from Wiseco's Armor Glide skirt coating, which minimizes friction and noise while contributing to measurable horsepower gains. Engineered to OEM specifications for 1986-2004 XR250R and 1991-1996 XR250L models, this kit represents proven performance technology trusted by professional racing teams across Supercross, Motocross, and GNCC competition.