Sticky SU linkage

[HI240ZNUT]

Aloha,

Im new to the forum and just purchased my 72 Z. The only problem I have with this Z is where the linkage that goes into both SU carbs. They are very "Sticky" and when gas is pressed it moves very slow and returns very slow which causes it to rev high when the gas pedal is pressed and very slowly returns to normal. What can I do to loosen up the link in both carbs so that it is not so sticky? Any help would be much appreciated. Mahalo, David.

[Nissanman]

Hi David and welcome to the Forum:)

I would try the linkage with the throttle shaft disconnected if you haven't already.

Then you can manually turn the shafts etc. and see where the binding is happening.

Apart from the rotating butterfly shafts on each carb, there are some ball and socket joints that may be stiff.

Try a dose of de-greaser on all the moving parts followed by a re-lube with WD-40 and see if that frees them up.

That 90deg crank arrangement on the firewall can get cranky and cause problems if the shaft pivot bearing is worn out.

There may be a bent shaft which is binding in the alloy bearings on the inlet manifold.

Also, make sure that you have the carb. return springs fitted or the linkage will be very tardy to return to idle even when everything is lubed up and free to rotate.

Probably nothing wrong that a good clean and re-lube won't fix:devious:

[HI240ZNUT]

Thanks for the suggestion. I will do what you said and hope that its simple as just relubing the shafts. Mahalo, David.