I've fitted a Trailtec Vapor computer to my 2002 FS650e. The rev counter on the Vapor gets its trigger from a few turns of sensor wire wrapped around the outer of the spark plug lead. The unit requires a number to be set in to the computer as part of the set up procedure for the rev counter. I've set this to 1 for a 4 stroke, however, if the Berg engine uses a wasted spark I may need to alter this number to obtain the correct rev reading. So the question is, does the spark plug fire once per 4 stroke cycle or does it fire twice?
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