That is why I asked the question. This is my first gas engine
and it seems like a bad or cheap design. I never really gave it
much thought intil we where sitting and talking about it one day
at the field during a bench flying sesion.
I looked at the CH ignition and it does use a clamp around the
plug, that is better then a pressure fit, but i would still rather
see bolt for the ground and a wire screwed to the plug for positive.
Thanks for all the info.
ORIGINAL: Crusty
Sorry Advent I missunderstood what you were saying, mine are grounded at a connection somewhere else, the shield doesnt make the ground contact anyway so I still dont understand what you mean...oops I get it now, If your particular ignition doesnt have the cap grounded elsewhere and just relies on grounding to the -ve side of plug, then it is indeed a bad design imo