There is a bolt and jam nut on the front of the governor that adjusts the bumper spring. If its too far in, it will affect the idle speed. With the Cub running and at idle on the throttle lever, back the bolt out and see if it helps (while keeping your fingers away from the fan). Only back it out far enough to get the idle speed you want, if you go too far, it can cause surging.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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