i think maybe it could be some electrical problem. your bike has gear indicator? you think and test what could cause shortening out.
maybe no good earth from battery. run thick cable (like automotive) from neg. terminal to bottom of engine at rear.
i think you can find solution - it is only a motorcycle! best wishes!
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1971 Garelli Gulp 50cc with open ports and 16 mm Bing Carbie + 1980 Honda XL 223 ZS + 2007 Zongshen LZX200G + DR400SM
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