Brassy,I don't think you understand the impulse angle thing. You time the mag to the engine, so that, at cranking speed, the impulse snaps and the mag sparks more or less at TDC. When the engine "catches", and speeds up to the specified RPM's, the impulse "drops out", and this action causes the timing to jump forward the specified number of degrees, to "running timing", all at once. Therefore, if you have the mag positioned so the impluse is snapping at the correct time, and the engine refuses to start, you have problems other than the wrong "lag angle" on the impulse. Even with the lesser lag angle, the engine should fire off just as well, however, at speed, the running timing would be later than desired, possibly causing it to lack power and run warm, however, it SHOULD start! I'm trying to jog my memory as to why a mag would have a lower "lag angle". It was probably for a kerosene burner.
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