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Sounds like it is letting unburned fuel thru the carberator and getting ignited by the hot exhaust. Your carb is out of adjustment or could be worn out.
to much air when mixing with fuel in carb find air mixtur screw on carb an whale running turn in slowley till it stops backfiring turning the screw in adjusts the air mixing with fuel the screw is useuly located on the side of the carb witch the toub hooked up to put fuel in carb is or you could re set it by screwing all the way in then screwing out 3 whole turns then whale running turn out til it back fires then turn screw in haf to three quarters of a turn in hope this helps
the best thing to do is to clean or replace carb filter.. check spark plug for fouling clean or replace also if gas has been sitting in unit and stored outside I would drain gas because of water contamination..
I would check for water in the carb bowl and also the flywheel key maybe sheared allowing the engine to be out of time with the ignition and cause it to backfire and pop.
Probably, but need more info. How old is the mower? Was it fixed or tampered with recently? is it a "cared for" mower? (Not left outside in the rain and snow...etc...) Backfires can have a few causes. Too much fuel, way too lean of a fuel mixture, (Not enough or wrong type of oil or mix ratio) Misadjusted mixture screws on carb, idle set too fast/high, generally it is a adjustment issue though. Try a tune up! Ya small engines need them more often than you'd think! And there is one more culprit for the loss of power you mentioned,and it may or may not be causing the backfires but you never know...and that is the mower blade's "sheer pin" or "Breakable keyway key" If (with the mower off) you reach the blade and try to spin it in both directions and it seems to move out of sync with the engine crankshaft (or wiggles a bit too freely) Than you need to replace the split /broken key with a new one. I had a Craftsman do that to me once and all the power returned like magic after replacing it. BE Careful! Its an easy fix if that is it, but you have to give more info.
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