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It sounds like the engine is running very rich, causing excessive exhaust and exhaust heat. The exhaust heat ignites the unburned fuel in the exhaust and causes the backfires. I'm guessing the engine runs quite rough with a noticeable decrease in power as well. You need to determine the cause of the misfire and fix it. How long has it been since the spark plugs and spark plug wires were replaced?
just a guess here but check coil for breakdown check timing and even check plugs wires distributor cap and even catalytic converter if it clogs up it can cause these problems
Sabre riding mower. Runs, back fires, almost dies,still runs. Back fires again, then dies and can not restart Please HELP!!!!!! Mower model #1438 14.5/38. Engine Briggs and Stratton, Model #287707, 14.5hp, OHV.
check harmonic balancer for slop back and forth,,,,these 3.8's have a crank posision sensor behind the balancer,that run off of the balancer,,,gthe rubber wears out and they start to flop around and timing gets messed up.../they cost around 100 bucks for a aftermarket,and if thats the problem,do yourself a favor and replace CPS while tour at it....good luck...Lee
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