I had used B-12 Chemtool (acetone) and also SeaFoam in the generator to absolutely no avail.
Was ready to buy another carb and then had MIB recommended to me.
I’ve never had anything work like this for me.
I also have a 1969 Arians snow blower with an ‘84 Tecumseh that would blow oil for the first 45 minutes of use and occasionally thereafter. 2 tanks treated with MIB stopped it. Couldn’t believe it. I’m figuring the ring grooves had gunk in them and it cleaned them out after two tankful’s.
I also treat chainsaw fuel with it and the saws usually run much better. Also use it in farting outboards to clean them out.
I don’t know what is in it but it doesn’t seem like a solvent in my sense of the word but it usually works.
Doncha love it when a miracle cure works? In the '70s I had a '64 Chevelle beater that I picked up for $150 bucks. Dented doors, least options and (unfortunately) an auto trans. But it had a 283 small block. It started smoking a little and running lousy even though everything that could be tuned was tuned.
I dumped a can of STP in it, not hoping for much, and drove it 30 miles to visit family. On the drive back it belched a good puff of black smoke and started running great. That motor ran like a champ for 2-3 more years until I sold it to a friend to put in a Willys truck.
I’ll give the MIB a try, too. I use Seafoam to get various old engines going again. The premium gas here is still ethanol free and I use it in all the small engines. I had a 1980 golf cart that I rebuilt and we used around the place for chores. One day the premium jug was empty and wife dumped some regular with ethanol in it. It ran about 5 minutes then died and has been parked ever since. I just don’t feel like rebuilding the dissolved fuel system.
One thing I think about, when I fill a small one or two gallon gas can with premium, I look at that long thick gas pump hose and try to think how much ethanol is left in it from the last guy who filled up. Is half my gallon jug premium and half ethanol gas?