Wiseco 4607M09800 98.00mm 10:1 Compression Ratio 635cc High Performance Motorcycle Piston Kit - Perfect for Engine Rebuilds & Performance Upgrades for Dirt Bikes, ATVs & Cruisers

Bore: 100.92mm Compression: 10:1 Compression Sizing: 3.00mm OversizeSPECIFICATIONS. Displacement: 635cc. Bore - Standard: 95.00mm. Bore - Actual: 98.00mm. Bore - Oversize: 3.00mm. Stroke: 84.00mm. Compression Ratio - Actual: 10:1. Note: Cylinder boring required. ITEM CONTENTS. 3858XH - 98.00 mm Ring Set. CW22 - ROUND WIRE PIN LOCKS 22MM (PAIR). S550 - PistonPin 22mm x 2.002in. NonChromed TW All Wiseco Pistons are forged from high silicon, low expansion aluminum which offers superior strength, reduced weight, improved heat transfer, and longer life. Diamond turned finish from one of the many CNC computer controlled turning centers guarantees you a perfect finish with no size variation. Wiseco pistons can be installed in any of todays cylinder bore compositions. Wisecos state-of-the-art computerized manufacturing facility is dedicated to supplying both the high-perfomance racer and recreational enthusiast with the finest forged piston available in todays market place.1984-1995 fits YAM XT600 1998-2001 fits YAM YFM600FW Grizzly 4x4