im having trouble with my warrior its its back firing out the carb and exhaust i checked my compression and i got 182 psi throttle open wide and 162psi throttle close now i bought it to fix and ride im wondering if maybe it may have been bored at once is why it has such high compression and that may be why im not getting gas properly is 182psi stock compression or what mm piston would it have to be? if so if it hasnt been jetted in the carb would that cause it to backfire out the carb also? ..... just open to suggestions thank you..

 

Its a 80mm bore and 64.5mm stroke stock. Maybe timing or valves need setting or a carb cleaning.

 

Hey bro i have a yamaha bruin that did the same thing. Im not sure about the mm or whatever but i took my carb apart and one of the ports had trash in it allowing just enough fuel to crank but run like junk. I recomend to use non ethanol in your bike considering that turned out to be my issue. its causes rust inside the bowl and creates alota trash. Hope that helped