| Forged 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: 128cc. Bore - Standard: 56.00mm. Bore - Actual: 58.00mm. Bore - Oversize: 2.00mm. Stroke | 50.00mm. ITEM CONTENTS. 2284CS - 58.00 mm Ring. CW16 - ROUND WIRE PIN LOCKS 16MM (PAIR). S270 - PistonPin 16mm x 1.850in. NonChromed TW |