From: "Steve Colwell" <mcmess1919@yahoo.com>
Date: January 3, 2008 1:18:04 PM GMT-05:00

I have not done any tests but I believe if One Mag and One Electronic Ignition is used you are likely to fail the Mag Coil prematurely (that would reduce the aprox. 400 to 600 hour normal failure of a new Slick to a really unacceptable life). Why?? One of the principal advantages of EI is the variable timing advance that improves power and efficiency.  When the EI fires a plug before the Mag, the pressure rise from earlier combustion may prevent the Mag plug from firing. Maybe (probably?) preventing the Mag plug from firing at least at higher altitudes where advance is the greatest. I base my theory on the old Champion Spark Plug Testers that used an air hose to increase pressure while firing a plug to check its ability to continue to fire.  What do others say?

Steve Colwell

Gary said....
On the other question about dual electronic ignitions:
I was thinking about building mine with a dual electronic ignition and the power source that I finally came up with (before I abandoned the idea in favor of using one mag)