Wiseco 4329M07550 75.50mm 10.5:1 Compression Ratio 251cc High Performance Motorcycle Piston Kit - Perfect for Engine Rebuilds & Performance Upgrades for Dirt Bikes, ATVs and Motorcycles

Bore: 75.50mmCompression: 10.5:1 CompressionSizing: 0.50in. OversizeForged from high-silicon aluminum alloy for maximum strength and dependability.. Innovative forging design and piston skirt provide maximum horsepower and torque.. Wiseco High-Performance piston kits are priced with piston, rings, pins and circlips (unless noted otherwise).. Oversize pistons require cylinder sleeving.. SPECIFICATIONS. Displacement: 251cc. Bore - Standard: 75.00mm. Bore - Actual: 75.50mm. Bore - Oversize: 0.50. Stroke: 56.5mm. Compression Ratio - Actual: 10.5:1. Additional Info.: Radial Head. Note: Cylinder boring required. ITEM CONTENTS. 2973XG - 75.50 mm Ring Set. CW17 - ROUND WIRE PIN LOCKS 17MM (PAIR). S523 - PistonPin 17mm x 2.429in. NonChromed TWThis item fits the following vehicle applications:compatible with Honda XL250R 1984-1987compatible with Honda XR250R 1984-1985