Don,
I'd suspect the butterflies are not properly centered in the chambers and if
they stick partially open this would account for the
increased idle speed.
Joe (C)
Don Marshall wrote:
>
> Amici..
>
> I need some help diagnosing a sticking throttle problem I'm having with the
> TR4 (full race, radical cam, etc. if that has any affect on the diagnosis)
>
> It runs fine, but when the throttle is released, about half the time the
> revs will only drop to about 2500 and stick there until I press the linkage
> at the carb to force it closed. The rest of the time it drops all the way
> to idle without any problem.
>
> I've disconnected the linkage completely and the springs on the shafts are
> adjusted tightly to pull the butterflies closed. The carb pistons are free
> and drop with a good thunk so I don't think they're sticking open. I
> haven't had the carbs apart to adjust the butterflies yet. There's a fair
> amount of movement at the shaft, so it might be sucking air.. could that
> cause it? Anywhere else to look?
>
> Thanks from sunny Florida, where some of us only get to vote once, dammit.
>
> Don
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