[honda rebel]

I have a 93 fourtrax 300 that is sucking on the exaust side and at the plug nothing at the carb anybody know whats up.

 

[Helmut]

Welcome to the forums. Probably a bent exhaust valve.

 

[shadetree]

check your compression..sounds like a bent valve..or out of time.

 

[cableguy256]

I would agree with the other two... had an old moto4 with same issue, getting blow-back into the air-filter box... took the head off and discovered my intake valve was bent to hell... got new valves and seals, put them in, and good to go...

*edit... to check your valves, if you take the head off, pour a little bit of gas into the intake side and exhuast side of the head and see if any pours out around the valves on the piston side... if any seepage, you've got either a bad seal or bent valve...