Hey John T - I'm not an H4 mag expert (all my tractors have battery ignition). But I have fooled with friend's mags from time to time.
Anyway the IHC H4 is functionally pretty much the same as your Wicos with couple minor differences:
1 - The "missing speed" - speed where the impulse cuts out - is 120 RPM (early production mags) and 150 RPM (later production).
2 - Lag angle is fixed at 35 deg for carbureted engines and 15 deg for gas-start diesels.
Neither the missing speed nor lag angle are field-adjustable. Rather, parts within the coupling (body cup, spring, pawls?) determine the missing speed and lag angle.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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