Engine starts but back fires through carb. exahaust valve rocker arm was off of the pushrod. pushrod is not bent neither is the valve. does it have a hydrualic lifter?
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Answers & Comments
Sounds like the exhaust valve is sticking in the valve guide or it is bent. When the valve did not come all the way back up it left a gap between the rocker arm and the valve stem letting it fall off. But for it to backfire through the exhaust that valve has to be open a little and the rocker is not holding it.There is no hydraulic lifter, it is a solid metal to metal parts from the cam shaft up. How to replace Briggs Stratton Intek Head Gasket Pt 1
Did you change the oil there maybe gas in it if float stuck on carb. also if rocker was off the valve maybe sticking in the valve guide sometimes you can clean with out taking all apart with carb cleaner