ORIGINAL: Tony Hallo
So you have a 14mm cap on a CM6 plug? The plug should be grounded to the shield, I would expect problems until this condition is corrected. Vally View or Agape Racing sells CM6 caps, there's a thread here that describes the process of replacing the cap.
The 3MM ignition (Rcexl) fits a CM-6 plug so I'd guess the situation is the other way around .... too small a cap on a larger plug. Still a grounding and general fit problem though!