a plug beginning to foul can make them backfire. think I would replace it first, jerry

 

I am new to this forum and am looking for some advise on our 610 Mule (47 hours) and a continues issue with fouling spark plugs. I have had to change the plug three times in less then 90 days, twice this month. Seems to be accelerated with the cold weather. Does anyone have any expeirience with this, is this normal? Any ideas would be great. Thanx!

 

not farmiliar with the mule 610 but if it is a single cylinder engine, you are simply getting too much fuel, the engine runs rich, fuel builds up in the motor and when it gets enough spark , bang theres your backfire. If you have to keep pulling the spark plugs because they are fouled that is also another common problem with running too rich or flooding your engine. Try adjusting the air fuel mixture a little bit leaner, and also clean your carb and maybe a hotter spark plug will help it fire all of that fuel.