Pull the flywheel and check the woodruff key. Sometimes they shear and it changes the timing . You will still have spark, and fuel, but it will just pop and fart.
I agree with this guy, Im a newbie when it comes to these skiies but I know if your backfiring through your intake(carb) then the intake is open at the point of ignition thus firing through the carb and it should be firing with all valves or reeds closed.
I agree with this guy, Im a newbie when it comes to these skiies but I know if your backfiring through your intake(carb) then the intake is open at the point of ignition thus firing through the carb and it should be firing with all valves or reeds closed.