I had the same problem that you are having with my 149. After almost every stop if you just stood beside the tractor you would hear the exhaust valve snap shut when it cooled down. It would only be a couple minutes after shutdown, then it would start right up again. I removed the air filter cover and the filter. Put some MMO in a squirt oil can, run the engine about half throttle and squirt the MMO into the carb. I fed mine enough to almost choke it down, when it clears up a little do it again. I did that several times then reinstalled air filter and ran it a short time then I repeated the procedure. I run MMO in the gas now and haven't had a repeat of the problem. My 149 has been a great tractor with almost no issues in its entire life. I do have one advantage over a lot of owners, I bought mine new in 73.
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