- Tue Dec 07, 2021 6:19 pm
#99244
I've taken the electrex electronic ignition off my 612 pre-unit bullet and re-fitted the points. Any time I've strobed it, it's been "glitchy" with regard to the fully advanced, it hits the fully advanced firing point normally but then wanders more than I'm comfortable with and I don't seem to be able to find a point where it's correct at fully retarded then hitting the correct fully advanced mark. I also went in past Hitchcocks for some other bits a while ago and they pulled faces when I said it had an electronic ignition.
Anyway, points on and it runs but it also looks like I have way too much advance on the auto-advance unit, there's 27 degrees of movement on it so if I set the fully advanced to 32 degrees, my idle is 5 degrees. Winding it back a touch to maybe 30 degrees to try to avoid pinking (it's running pretty high compression) puts the idle at 3 degrees BTDC. This makes it latchy to start then it "runs away" when it advances slightly and won't settle back down again. I can set it for a lovely clean start, idle and pick-up off the throttle but then it's too far advanced at full speed. I can't get a clean idle with less than 7 degrees at idle which puts fully advanced at 34 degrees, which is way too much.
It'll need new springs anyway to try to hold it in the retarded position for a bit longer (and they are the original springs which will be pretty weak) but I was wondering if there's a known way of adjusting the amount it advances? The answer is probably a new unit but they're getting thin on the ground unless you go to India. Also I think it would be good to try it with even less advance than the standard 22 degrees.
Anyway, points on and it runs but it also looks like I have way too much advance on the auto-advance unit, there's 27 degrees of movement on it so if I set the fully advanced to 32 degrees, my idle is 5 degrees. Winding it back a touch to maybe 30 degrees to try to avoid pinking (it's running pretty high compression) puts the idle at 3 degrees BTDC. This makes it latchy to start then it "runs away" when it advances slightly and won't settle back down again. I can set it for a lovely clean start, idle and pick-up off the throttle but then it's too far advanced at full speed. I can't get a clean idle with less than 7 degrees at idle which puts fully advanced at 34 degrees, which is way too much.
It'll need new springs anyway to try to hold it in the retarded position for a bit longer (and they are the original springs which will be pretty weak) but I was wondering if there's a known way of adjusting the amount it advances? The answer is probably a new unit but they're getting thin on the ground unless you go to India. Also I think it would be good to try it with even less advance than the standard 22 degrees.