RE: Smallest CM-6 spark plug boot
I do no but I do not care,just add a 1k 1 watt resistor at the spark plug cap.Would probably be OK with pCM or 2.4.or Ralphs Pro Line.
Flew Sun the first time with one batt for ignition and radio.Seems to be fine but against my better judgement.Using LIFE batt. I did install two Diodes in jumper to Ign from LIFE batt.
BC