RE: Quadra 42 what spark plug to use
The plug is Denso U20M-U.
I've never seen one of these.
I'm concerned the ignition plug cap might not work with
a diffrent head.
I called Bennett Built today and Mr. Bennett is out of the store until February 21.
And I'm getting close to finishing the SPAD and I sure would like to fly
it before then, and also would like to put a new plug in the motor since it has
been sitting for awhile.