Originally Posted by Keita
I have looked at the dizzy but it only has one locating slot,any other ideas???
OK, here's another long shot. Has it got a single vacuum advance unit, or a dual? If it is a single, then no probs. If it has had a dual fitted, then you may have problems.
Actually starting up an engine after a rebuild/carb change/dizzy change shouldn't be a problem. If everything is set to "basics" then it should fire and run "OK". If it is backfiring then you have a problem. But, other than what has been posted so far........
I would go along with the vacuum leak up to a certain point, it should make it impossible to set the idle, but not backfire. If the static timing is around 6 before, and the idle mixtures are about 1 and a half out, then it shouldn't backfire. (please, no critism on the "spec's", it should run...... then again, it should run anywhere from 20 before to zero, and the mixtures are "flexible" on a startup as well)
Oh yeah, I try and think of "extreme" problems, like the slots on the dizzy rotor (that's always a good one when it happens....)