Last year I got my motor rebuilt. I broke it in by medium idle for 20 min(first l let it idle till warm), then off fo 20 min, then rode around in 2nd for a bit, not to aggressively for an hour, let it cool, then went for a 2 hour ride...

Anyway, everything was great for like 4 months untill one day out riding, it out right died.... at first it seemed to wanna start, but it diddnt.

The engin sounds like its hollow, like eather its got an internal hole (cuz its not leaking any fluids), or the valves stopped moving...

I can only come to these results from my auto experiences both in-shop and stock car racing, but all that aluminum... shesh.

And I dont need to blow another $1000 in yet ANOTHER rebuild.

Its a 94 bayou 300 4x4, and thankx in advanced for any input.

 

do you have compression?
got a compression tester?
what does the plug look like?
pull the valve covers and rotate the motor

who did the motor work? any warranty? You should let whoever did the work know what happened,,,,maybe they will be willing to give you a hand. It could be something simple.