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Jun 16, 2010 · The coil can be checked for resistance with a multi meter. Don't know what an 80 should should read but 84 to 88 should read,primary coil 2.5-3.5 ohms, secondary, 11250-13750 ohms. Also check cam sensor they can do some goofy things. with engine running spray with electrical cooling spray,then heat with hair dryer. If engine changes replace. Jan 02, 2011 · The forces act against each other: the coil will stop rotating! How then can a real motor keep going in the same direction? And how does it not twist its wires into a mess? The Commutator The answer is to use a commutator. This device prevents the wires from twisting. More importantly it actually allows the coil to keep rotating in one direction!