Sticking throttle shaft

[59ghia]

Hello fellow Zers,

My front carb throttle shaft seems to be hanging up. I've disassembled and cleaned all the pivot points but the problem is still there. What kind of grease do you use? I've used a lithium based grease. Is there a way to lube throttle shafts without complete disassembly? These are on my 72 with round top su's. I've checked for vacuum leaks using Berrymans carb cleaner and none were detected. The throtlle shaft is snug with little or no play in them. If i blip the throttle in goes to normal idle speed, from around 1200 rpm. I know its the front because I can push down where the spring goes and it moves down. I tried swapping springs nothing.

Any ideas?
Thanx Dave

[v12horse]

I don't think I can answer your question, but maybe you can answer mine. I have 72 su's on my 260 and The linkage or the throttle cable seems to be sticking. I am not sure which one, but when ever I am in 1st or 2nd gear the car jumps when I step on the throttle because something is sticking. the only reason I think it might be the linkage on the su is because when the engine is warmed up it is not as sticky. If you have any ideas or your are experiencing this your self please tell me. Thank you. - Ben

[beandip]

59 , check the linkage , you may find something is binding. Unless there is some crud on the piston and causing it to stick. If this is the case , just remove the dome and carefully lift off the piston . Be careful not to damage the needle, clean the piston and the cylinder it slides into. After reassambily insert your finger and lift the piston and let it drop and it should do so with a clunk when it bottoms , if not you still have dirt holding it back , check to be sure the needle is not bent and rubbing on the jet as it travels in an out. Dont forget to refill the dampers with oil . I use 20w only , but thats me . Gary v12 , you may be experiencing the same thing . The only "cables" that go to the carbs. is the choke cables. the throttle has linkage directly connected to the gas peddle. If you are having choke sticking trouble , it could be caused by the small fuel line that runs from the float bowl to the bottom of the grose jet. They harden with age and cause the jet to stick in its movement up and down as you adjust the choke level and then "turn off" the choke when the engine warms. This causing poor fuel ecomony and poor performance. Some things to look at and things that could vary well cause the things you two are trouble with . Gary:classic: