I had the same problem a few years ago. Took me several weeks and some new words to figure out what was causing this. The mag drive gear or timing gear was moving toward the front of the tractor letting the mag lags slip out of the slot in the timing gear. The only thing that keeps the gear from moving away from the mag is a thrust spring and thrust pin. To get at them you need to remove the governor housing. You can do this without removing the radiator but it takes a little time and patients. Once that is removed you will see the shaft that is connected to timing gear. It has a thrust bearing and thrust sleeve riding on it. The shaft is hollow and it has a spring and pin in the end. That spring is either bad or needs to be stretched a little to hold that timing gear into and toward the mag. Hope this helps.
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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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