Well then it could be a passage cloged. Ran into this with a Mc Culloch chainsaw once. The gasket that goes between the carb and the manifold. There is a little 1/8 dia. hole that was missing in the new gasket. Punched the little hole and bingo! Are you sure the needle seat isn't "f" up?. Is there slop in the linkage between the govenor and the carb butterfly valve? That will also wreck your day. That is why Briggs engines have that little spring on the rod going to the butterfly. Any slop at all and they go Squirrely. Have seen this so many times with portable generators. Those thing are ment to run full tilt at 3600 rpm. They work Perfectly when you pour in Hi-Test gas. With regular they keep hunting. Really, see if it helps.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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