Attributes . 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: 125cc. Bore - Standard: 54.00mm. Bore - Actual: 55.00mm. Bore - Oversize: 1.00. Stroke: 54.5mm. Note: Pro-Lite. Note: Nikasil Bore. Note . Values