Re: 33hp skitwin, intermittent miss

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jerry-ahrens

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#82891

Here’s something that came back to bite me after a recent ignition system rebuild on a Big Twin… The new coils I used did not have a threaded pin where the spark plug wire connects (screws) to the coil. After all these years, they now just have a straight ”pin” that you simply push the spark plug wire on to. In turn, you really have to make sure the metal hold down clip on bottom of mag plate) is holding the wire from backing out. Make sure the little rubber boot is also in place. The other classic mistake, is the routing of the coil wires that go to the points (along with the condenser wires). They can easily get chaffed by the rotating flywheel. The modern coils have longer wires, so it’s easy to do.
I rarely ever change plug wires. The 50s style wires are about bullet proof, and better than anything you can buy today. Cut in to an old one someday and see how their made.