tasha, i"d go back over the tune up first, recheck everything. check breaker point gap just to be sure. recheck the plug wires for correct firing order. next re-check the ignition timing. the m is timed "static" ie engine off. set the timing indicator pointer at zero, top dead center, then use a test lite to set the distributor so the points just open. that should get you in the ball park. next set the carb. idle circuit is about 1 and one half turns open. for the main jet, start at about 3 and 1-2 turns open. start tractor and let it warm up, say 5 or 10 minutes. open throttle wide open, then adjust main jet out till tractor starts running rough, about 3-4 to one full turn, then go back in to where it settles down and smooths out. kind of a sweet spot. see if that takes care of the problem. if not, then pull the distributor cap, and gently turn the rotor and see if it snaps back. if it does, the advance springs are working. if it doesnt, the distributor timing is not advancing and that can be your problem. last, to check for a vacuum leak, with the tractor running, spray some carb cleaner around the carb gaskets, and also where the manifold bolts to the engine. do this outside, and have a garden hose handy if the carb cleaner ignites. if the engine changes sound when you are spraying, that is where your vacuum leak is.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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