All above makes good sense. Another question I have asked and never got a answer is....I have 2 or 3RCEXL ignitions. From brand new I noticed only one had a real crisp blue spark with same sparkplug...all tested with same battery and pickup sensor. Why is the spark better on some RCEXL units than others? Could it be a sign ofhow long they may last???? Just curious. Capt,n