Hi Mickey,
Look for air leaks between carb/manifold/block. My (SU'd) LBC
started to "hunt" up and down, and I found the bolts holding the
carb to manifold were slightly loose.
Jeff
> I just finished reinstalling the carbs I rebuilt on my 6 and seem to be
> experiencing an idle speed problem. Before spending a day or two
> troubleshooting and tuning, I thought I'd see if anyone here has
experienced
> this: When idle screws are set to give a 900-1,000 rpm with engine warm,
I
> get a random increase in idle speed to about 1,500 - 1,800 for about ten
> seconds then back to 1,000. Choke is all the way in. This happened about
3
> or 4 times during a five minute period. No adjustments were made during
this
> time. Could I have a bad needle valve?
>
> On my carb set only one bypass valve is adjustable and I haven't fooled
with
> this yet
>
> I've got all the emission hoses replaced correctly for a '72. Again, have
> done no mixture adjust or synchronizing yet.
>
> Any (hopefully easy) suggestions from the list?
>
>
> Micky Long, Atlanta
> 72 TR 6
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