Another Theory: The text of the MSD warning as quoted a couple messages back
specifically says that operation of the MSD could be disturbed by RFI, such as
that produced by solid core wires. This indicates that whatever control
circuitry is in the box can get confused, and maybe it won't be making sparks
quite the way it should. The interference wouldn't have to break anything to do
this. It would probably work fine away from the rpm range where the sparks
happen at just the right time to screw up whatever important decision the
control box is making.
Stu
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