I just got my newly restored 4A back. It is running, but I thought I would
do the final tuning work myself. I had already rebuilt the carburetors, and
I think they are mechanically fine.
The issue is that on idle, it will idle somewhat high (1000) initially (like
when coming to a traffic light) then gradually idle lower and lower until it
gets pretty rough at 600 rpm. It usually holds there and dies not stall.
It SEEMS/SOUNDS like it is running rich at idle, but lifting the pins on the
carbs indicates the mixture is about right.
So, I want to start at square 1. I want to check the timing, and I know how
to do the static timing method, but I want to avoid it for simplicity.
Does any one know what a timing light will show in the way of advance when
idling at 800.
The static advance is supposed to be 4 BTDC, but the mechanical advance
comes in at 350, and neither the mechanical advance curve nor the vacuum
advance curve are specified anywhere I can find.
Has anyone set the static timing then measured the timing with a timing
light (need one with the advance/retard knob on the light) to see what it
reads when set by the book? With and without vacuum advance?
Any ideas about the bogging down at idle? I will be getting my colourtunes
out today as well.
I am in digest mode on the list, so please CC me personally too!
Thanks,
Tony
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