As it’s pouring down outside I thought I’d look at this troubleshoot twin.
I’ve made a short video and there’s does seem to be a problem with the cdi box, as far as I can tell.
It’s appearing to fire on both plugs when the hall sensor is moved quickly over the magnet. However, when moved very very slowly ( just creeping around by hand) only one spark fires.
https://youtu.be/P9StyOulYBMThe spark stays only on one lead. Changing plugs makes no difference. So in practice swapping the ht leads on the engine should swap the fault to the other cylinder but it doesn’t !
Fly ‘til I die...