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 - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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