I wish there were such a thing as a Fairbanks Morse H4 mag. (Maybe I have the only one!) No, this is an International H4, like the ones that go on Farmall Tractors. It is crazy how it fits on the F162. I wonder if long ago, the Int'l mag was somehow mounted to the FB mounting flange.
It gets crazier. According to all the serial numbers on the mag, and according to the big "L" stamped on the impulse drive, this is a CCW mag. (CW mags are stamped with an "R", for "right" as in the direction of movement.) But, it only turns clockwise, which is good, because the F162 turns clockwise. The Int'l magneto service manual does explain how to get a CCW mag to turn CW, so I guess this mag was reversed when it was made to fit onto the F162.
This is all crazy, but really, it shouldn't matter. The mag makes spark at high RPM's, and not at low RPM's. I'll check out the impulse, like you said. If all else fails, I'll just buy an FB mag.
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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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