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I was riding my quad up the street headed to some trails and as soon as I kicked into third I lost all power and couldn’t see threw the smoke where do I start on the rebuild
 

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Welcome to the Forum...!!!

Remove your air filter and check for any dirt & anywhere dirt got into your intake tube...any dirt can destroy your rings & cylinder wall

Take the head/valve cover off & look for anything out of place or damage..

Can you do compression test....??
65~75 psi normal testing range...below 49 psi is bad...

Or skip all that & just remove the head & inspect the valves & piston...!!!
 
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