Just rebuilt the top end on my 08 big bear 400. Piston rings wristpin gaskets. Got it back together it runs no back firing or popping but it takes a lil long to idle down and every now and then it kinda burps or misses for a split second and not often either I guess and then recovers just fine. Could the timing be off a tooth and cause this or would it be backfiring and popping a lot? Any other ideas?
2008 Yamaha BB - Issues After Rebuild
in Yamaha ATV Forum
Posted
Just rebuilt the top end on my 08 big bear 400. Piston rings wristpin gaskets. Got it back together it runs no back firing or popping but it takes a lil long to idle down and every now and then it kinda burps or misses for a split second and not often either I guess and then recovers just fine. Could the timing be off a tooth and cause this or would it be backfiring and popping a lot? Any other ideas?