Piston Kit (C) - Standard Bore 77.99mm, 13.5:1 High Compression For 2009 Honda CRF250X Offroad Motorcycle Excellent economic alternative when you are looking for an OEM quality replacement pistonMainly manufactured in Japan by reputable Original Equipment Manufacturers to ProX exact specifications and high quality standardsSleeved cylinder piston kits are available in standard size and a Wide range of oversizesPlated cylinder piston kits come in standard size, as well as in A, B, C and D oversizes if availableProX leads the industry in cast and forged pistons made specifically to replace OEM partsComes complete with pistons, piston rings, wrist pin and circlips *Bore Diameter: 77.99mm