but why would you want to do that, and can it not be done by turning the dizzy/phase sensor?
Yes i could adjust the dizzy, but thats not what i want to acheive. I want to be able to alter the timing at different points in the rev range. Trouble is there is no crank position sensor, and some of these things seem to need one. All i need is something that maybe can interupt the coil ground and retard/advance it.