When you use this Polini 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.
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*You may need to modify your engine case to accommodate the larger cylinder.