47mm (68cc) Big Bore Cylinder Kit for Honda Lead 50cc 2-Stroke. Kit includes cylinder, piston, rings, piston pin, cir clips, gaskets, exhaust studs and a #85 carb jet. Cast iron cylinder and double ring piston for longevity. When you use this 47mm Big Bore Kit in conjunction with your stock crankshaft you will increase your total displacement to 68cc! The manufacturer claims 6.8bhp at 7,300RPM is possible with this kit. Suitable for use with stock or performance exhaust. Your stock head will be reused. This works for models with variators only! Please check the exhaust flange angle on your stock cylinder to confirm compatibility. Please see our Warranty Returns Policy.*You may need to modify your engine case to accommodate the larger cylinder.