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Registered
Join Date: Nov 2007
Location: Orange, California
Posts: 474
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The tach jump is a clue. This could mean the 12V power to the CDI is dropping out since the CDI has an internal 33 or 120 Ohm pull-up resistor to inyernal 12V that feeds current to the points. The tach is connected to that signal. OR, have you checked to be sure the points are gapped properly? (Around .016 inch). Sometimes their rubbing block wears down so much they are only opening a few thousands of an inch and completely close as they heat up.
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