Inliners International Forums General Discussion Engines internal or external resistor Coils?

I don't think a 6v coil will last very long hooked to 12v . I've tried it before for short periods of time when testing a used engine & found that a 6v coil will get very very hot.Early Chevrolets were wired with a "by-pass" wire to feed full 12v to the ignition when starting & then route the "juice" thru the resistor in the normal run position. The wire on later models is left bare on the starter solenoid or left off later solenoids alltogether.