Misfiring Dommie
 

Dawdling round East Dulwich today, my Dommie suddenly conked out. I restarted it and it fired up ok, idled ok (idles at 1600rpm), but as soon as I tweak the throttle it dies. Plug looks OK (greyish). I managed to get it home by keeping the revs up but it's misfiring.
Any thoughts?

Carburretor or CDI. I would check the CDI first.