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Don"t mess with the governor linkage. That is rarely the problem unless you messed with it after making your component changes . Set the main jet 1-1/4 turns out from full close and the Idle air 3/4 turn out from full close . Start the tractor and see what happens. Make sure that you put the gasket in the connect flange between the carb and the intake manifold and that the joint is tight. Start it up again, set the idle rpm (~400rpm) with the screw on the throttle rod connection to the carb, and see if the problem persists. If the problem continues, put a timing light on and see what the timing is. If it"s not 6 oBTDC at Idle rpm (~400rpm), adjust to that value. Advance the throttle to above 1000 rpm and notice that the timing increases. If it doesn"t, something is binding in the advance mechanism. You"ll need to fix that. If you still have the problem, check for manifold leaks. You can use starting fluid or propane from a hand held torch. With the engine running, CAREFULLY spray starting fluid or propane from a non-lighted ptopane torchc around the carb shaft, the intake manifold to carb joint and the cylinder head to intake maifold. If the engine speeds up when you spray it near these areas, you"ve found your leak. Do these things systematically, checking the operation after every change, and you should find the root cause of your problem.
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