Be advised that carb problems and ignition system problems have a LOT of
symptom overlap and that ignition tune up parts available today are very
much inferior to what was available when point ignition systems were the
industry norm.
When I get what I believe to be carb issue that is not obviously
apparent, such as fuel leak or linkage falling off, I check the rotor,
cap and points early on. A lot of time my "carb" problem is slipped
points and these days bad rotor.
When I get what I believe to be ignition system I also check the fuel
filter, sediment bowl and fuel pressure.
An engine that is reluctant to return to a certain idle level can be
something like carb linkage, slipped or uncentered needle, crud in the
carb, or it could be something like a sticky advance that is not
returning the advance back to zero, weak or broken advance springs what
start the mechanical advance at lower RPM. A poor idle could be any
number of ignition problems, including bad distributor bushings (side to
side shaft wobble), a high voltage short, poor plug centre wire or any
of the tune up components.
What I am suggesting is don't spend a whole lot of time trouble shooting
one system without at least running basic tests on the other.
I did that once. Sent a pair of carbs off to The roadster Factory for a
complete rebuild and later discovered that my distributor's advance was
sticky.
TeriAnn
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