Posted by Tom Fleming on May 03, 2012 at 18:20:24 from (67.20.233.126):
In Reply to: FM-J Magneto Timing posted by Paul in CT on May 03, 2012 at 09:26:18:
Chuck, good practice on the grounding, however the IHC mags have a safety gap built into both the E4A and F4 mags that takes into account the fact that a plug wire MAY fall off during rough operation. This safety gap prevents backflow to the coil and gives the energy generated as the field collapse occurs to prevent coil damage. It is normally set to a greater gap than the plug gap. So, if you have REALLY worn out plugs, or a broken/loose plug wire, no damage to the coil becaue the spark will jump the safety gap.
I cannot comment on a FM mag, but I would think they have the same type of safety feature built in if a wire comes loose from a plug.
while an excellent point, not required for correctly "tuned" IHC mags.
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