I've got a friend with a Zero Turn mower with Briggs engine that was given him because after running for a few minutes it would quit. It's apparently been sitting in his pole barn for a number of years.
Last night I get a text from him that he got it running. Only problem is when he shuts it off there is a shotgun-loud backfire and do I have any ideas.
I sent him information on the anti-afterfire solenoid speculating that it probably got gummed up and is stuck open.
Turns out a mower "mechanic" he knows told him his mower is too small for his lawn and will shut down in less than an hour. The "mechanic" told him if he cut the tip off the anti-afterfire it would make the engine run longer.
We were doing this by text and I had other things going on so I'm not clear on whether the anti-afterfire was the cause of his shut down problem or if he ruined a perfectly good one before finding the real issue.