Fred, I had a couple of problems with my HS4 that I put on my Spitfire
in similar manner.
1. return spring was not strong enough so I had to add additional one to
pull the linkage back to idle as it would be fine for small throttle
opening but not large ones.
2. Even with that when on a long trip last year and it got really hot
and dusty the mechanism kept sticking. If I blipped the throttle fast
sometime it would come back but most of the time it would not.
Frustrating when you are stuck in slow moving traffic with 100 F heat.
That evening I tried to clean up the linkage and oil it. Worked fine and
from then on I clean it up and oil it frequently.
Could even be a slight misalignment causing the stickiness.
Alan
Fred Thomas wrote:
>For the past 3 months after driving for any length of time or distance when I
>shut off the ignition and then attempt to restart the throttle linkage seems
>to be stuck or held open at a very high RPM, sometimes almost full open, I
>have to turn the ignition off very quickly or thrown a rod, raise the hood and
>push the linkage closed, I have replaced "all" of the linkage, readjusted all
>of the throttle stops, reset the timing, replaced the clamps on the throttle
>shafts and all to no avail, so the "quiz" is what is causing this problem on a
>T/R 3 with H-6 carbs ?? Randall stay out of this. I'll buy the winner his
>favorite beverage, this is very simple and easy to be overlooked, but a good
>tip for others if you ever run into this problem. "FT"
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