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Easy. (Maybe). Ill bet you have a 35-40hp right? It. Has a vacuum cutout switch, right? Ill bet you have the vacuum cutout switch wired incorrectly?
Wire from upper set of points goes directly to the kill switch. Wire from lower set of points goes to the center terminal of the vacuum cutout switch.and the other side of the kill switch goes to that same center terminal.
Finally,the body of the vacuum switch is grounded through either a mercury switch or a micro switch under the mag plate.
My guess is that you have your kill s switch wire connected to the mercury or micro switch instead of to the center terminal/other set of points. Or some variation of the above.
Great point Frank, betting on this explanation for sure…
NJ: Does your engine have the vacuum switch set up??