As in the engine refuses to slow down, even with the idle stop screw backed out, and hand holding the throttle shut?
If so, sounds like the throttle plate may have come loose from the throttle shaft, or it was removed and incorrectly installed. The plate must be centered on the shaft and in the bore before the screws are tightened. There is also a beveled edge that must be installed so it seals off the edges in the carb bore. It will only fit properly one direction. Also a worn throttle shaft or shaft bushings will cause poor idle control, and vacuum leak around the shaft.
If the idle can be slowed by hand, but revs back up when released, throttle cable and the governor adjustment. The governor should be able to push the throttle closed with slack in the spring and the engine running.
If you're saying the engine dies when trying to get it to idle, that could be the idle circuit clogged or sucking air between the top cover and the bowl. The idle fuel is drawn up from the main well through a small passage beside the venturi bore. If the gasket doesn't seal at that hole, it won't idle. Also low compression will cause dying and poor performance at low RPM.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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