When you use this Polini 43.5mm Big Bore Kit in conjunction with your stock crankshaft you will increase your total displacement to 64cc! Aluminum construction with a single ring piston for high performance. The manufacturer claims 6.2bhp at 9,000RPM is possible with this kit.
Should work with Puch E50, ZA50, and Tomos A35 engines. Please see the Specifications tab to confirm.
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*You may need to modify your engine case to accommodate the larger cylinder.