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 - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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