With the tractor warmed up for 15 minutes or so. set the static timing and make sure the centrifugal advance is allowing full advance at high idle (assumes distributor, not Mag. Mags have no advance)(full throttle no load) Idle it down to slowest idle. Set the idle speed to about 500 or as slow as is reasonable. Adjust the idle mixture screw in and out until the idle is as fast and smooth as possible. Readjust the speed. and repeat the mixture adjustment, finessing it to smooth. if the surging goes away, great! If it does not, it at least sure not the mixture settings or IGN. Internal and external governor settings and surge suppression adjustment should make it correct. Jim
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