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Need some help

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Its 58mm. Wossner and im sure others sell them but I am unsure if it is compatible with your year or not.

Edited by 223hpyhooker

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Like has been said, the piston size is 58mm (57.95 technically).  Really the best way to do it is to find out who did the big bore and then go through them for pistons.  Eric Gorr (forward motion racing) has pistons for the 144cc big bore kits, but I am not sure he will sell them to you if your bike was built by someone else. 

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