The CDI box

[TheRepoGuy]

I frequently get asked how, on a double-ended coil, ONE plug could fire, while the other does not.

There's usually two main reasons... first is that ONE of the plugs is oil- or carbon-fouled, so spark energy is just passing through the oil or carbon, to the block, without generating a spark. The OTHER way, is that the coil has a bad spot in it's insulation, and that bad spot is closer to one side of the windings' plug tower than the other. Instead of jumping across the spark plug gap, it jumps from the coil body to ground... so the plug on the near side of the coil doesn't fire, but the far one DOES.

That’s the exact reason why im replacing the CP in my bike along with a new plug for the number 2 since it’s not burning like it should. Once that’s done then I’ll be able to make a better determination as to if I’m going to use 1500 coils or keep the neon CP and go from there.


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