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: 101cc. Bore - Standard: 52.50mm. Bore - Actual: 53.00mm. Bore - Oversize: .50mm. Stroke: 45.80mm. Cylinders: 1. Coating: ArmorPlating. Skirt Coating: ArmorFit. Note . Values