Predator 9500 Generator backfiring on shutdown.

[ILENGINE]

I see you're a certified B&S engine Master Service Technician. Good to have on the forum. What I know about small I've learned the hard way; other than the training I had in high school (about 50 years ago when rural schools were still funded for agricultural/craft education). I also owned an air-cooled VW for 35 years, which is basically a very large 4-cylinder lawn mower engine. Once you understand how air-cooled engines work, it really isn't hard to keep them running well. Somehow, the importance of being able to tune up an air-cooled engine, or sharpen a chain saw, or set the kerf on a handsaw all took a back seat to pronoun awareness and diversity sensitivity. Meanwhile, we have about 4 generations now that the majority of can't tie shoelaces or look up from their phones long enough to have an intelligent debate about anything.

There is a story behind my MST. Back in 2001 when I first became a Briggs dealer my area rep for Briggs was an A--. So his remarks to me was I don't know when I will be able to get you set up for the 4 day Briggs factory school, but if you take the MST test and pass it you will be exempt from the factory school. At that time the test was a 4.5 hour hands on timed test with a 80% first time failure rate. The day I took my test there was another person that had been a tech for close to 30 years that was taking it for the 5th time.

Anyway I took the test and received an 86% which made me one of only 2 in the state of IL to ever pass the test without going to the school first. And I later becomes friends with the other person which got an 88% on his test So after that the Briggs field rep never give me a hard time.

But like you, I learned to work on small engines by trial and error, mostly error. No formal training as far the basics. Had to do the Kohler and Tecumseh factory schools to become a dealer but no other prior training.