Hi There Your Name John,
When you say "idle screw" are you referring to the large jet adjustment
nut
on the underside of the carb which determines the jet position?
If so, this means that the jet and the needle are out of alignment.
Aligning
it properly is quite difficult with it on the car, but not too tough on
the bench.
Problem is the condition you described often wears/bends the needle or
wears the jet(nozzle).
With the damper out, and the nut screwed all the way up, the piston
should drop freely.
Jim
Your Name wrote:
>
> I have been having idling problems....I adjusted the idle screw on the rear
> carburetor as part of my "troubleshooting" (the shop manual discussion of the
>SU
> carburetors looks like a direct translation from the original...I have trouble
> following it). Anyway, now the needle and piston seem to intermittantly hang
>up
> before they close completely. Turning the idle adjust screw seems to solve
>the
> problem.
>
> My question is: Have I terminally screwed something up? Should this happen?
>What
> do experienced roadster owners do in this case?
>
> Thanks
>
> John Sugar
> 70 2000
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