| 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: 134cc. Bore - Standard: 54.00mm. Bore - Actual: 56.00mm. Bore - Oversize: 2.00. Stroke: 54.5mm. Dome Type: Flat Top. Note: Racers Choice. Note: No Intake Window. Note | Pinned on centerline. ITEM CONTENTS. 2205CS - 56.00 mm Ring. CW15 - ROUND WIRE PIN LOCKS 15MM (PAIR). S467 - PistonPin 15 x 41mm NonChromed TW |