Posted by Tom in TN on June 01, 2010 at 07:06:25 from (4.152.159.108):
Hey All,
I have an old Craftsman lawn tractor that I bought at an auction a couple of years ago. I don't know how old it is, but it's in very good shape.
It has a 12 horsepower, overhead valve Tecumseh engine. It has run well for two years, but now, it appears to be overheating. It runs and cuts well for about 20 minutes, then it bogs down in tall grass. If I shift to a lower gear it runs fine, but eventually I have to go down to first gear to keep going.
Yesterday, I noticed that the gas in the gas tank is actually boiling when it gets to the point of bogging down.
I'm GUESSING that the intake valve is not seating properly, allowing compression to get back into the carburetor/gas tank causing the engine to starve for fuel.
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