How tocheck timing onbriggs stratton model44577

Why Does My Engine Backfire or Afterfire Briggs Stratton

timing issue. Remove the flywheel to see if it has "spun" from the keyway. If the motor doesnt run at all but just backfires thru the carb, it could also mean really bad intake valves, but I would definitely check the timing first

check intake valves for proper seating. If the valves do not close completely it will allow the engine to backfire thru the carb. Another possibility is internal timing caused by the misalignment of the timing gears between the crankshaft and cam gears.

need to reset the govanor.

This is a true tale sign of a valve being out of adjustment or possible burnt or sticking. Most likely its just out of adjustment. Setting them to Book Specifications of: Valve Clearance (cold) IN and EX .005" (0.13 mm) should take care of the problem. Since you said that it runs fine rules out the possibility of a sheared flywheel key, though I have seen one run with it slightly sheared. Thanks; George

timing key under flywheel costs 1 dollar

Backfiring is either burned valves or often due to timing slipped because of broken flywheel key/keyway.

Check to see if the carb is clean, if so the anti diesel value could not be working. Apply 12 volts to value and see if it move's. If that works then you may what to check the fuel pump and see if it pumps. After you tried all that then you may have change the main jet size because these engines come with a small jet for the EPA.

Backfire often means the timing is out?