RCIGN1, I can tell you know what you are talking about. The engine in not worth the $ money to put a new ignition on, so a plug or cap. I did try another cm-6 plug with the same luck. I called NGk. they make a resistor plug that is only 1 mm longer. It is the NGK cmr6a stock number 1223. if I have the room it should be fine if not I will add a 1mm shime and it should still be fine. I hope this fix's the problem. If not DA makes a cap that may work too. I will report. Thanks for all the info.