Reply To: '65 BigTwin 40hp 1/2 spark

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May 6, 2019 at 8:34 pm #174909
Don
Participant

    US Member

    How did you isolate the stop leads? Did you remove them from each set of points? Did you replace the HV plug leads? Perhaps one of them is arcing under the mag plate. Sounds like you have replaced the coils, points, condensers, then swapped them again with no change, still no spark on the upper #1 cylinder….