Its a bolens rider has the Briggs and Stratton 15.5Hp I/C
Started running like shit so I shut it down checked all the easy stuff air filter,oil,fuel filter and replaced the plug. Mower is only 3 years old. Wont start unless the air filter is off and it still runs nasty and backfires thru the carb very bad/loud if I put the air filter back on when its running it eventually dies. If I turn the blades on it dies.
And by running like shit I mean shaking, backfiring, and hardly running at all..
Any ideas? Major breakage internally? Bent valve or something?