Naraku GY6 63mm Big Bore Kit

Naraku 63mm Forged Piston Big Bore Kit for 150cc and 125cc GY6 4-stroke engines and engine based vehicles. Crankcase modifications are needed for this cylinder kit. Increases displacement to 180cc! Please see our Warranty & Returns Policy. Bore: 63mmOuter Sleeve Diameter: 64.9mmDisplacement Increase to 180cc Overall Height (cylinder): 90mm