Topic: '75 750 Carburetor Link Arm (Shaft?) sticking

[hedog]

I've had my 750 for a couple of years now and the throttle has ALWAYS been slow to close. So this winter I took the carbs off and cleaned them up and also wanted to address the sluggish throttle response. This is my first bike and I'm not sure what I should be trying to fix on this. I know that I could try to replace the throttle return spring, but even without the spring it takes a fair amount of pressure to get the carbs to open and close. I attached links to some videos. One has the spring attached and the other is without the spring. Thanks.

With the spring attached
CB750 with throttle return spring

Without the spring attached
CB750 without throttle return spring

[seanbarney41]

I recently had this problem with a set of pd42a's...turned out number 4 throttle body got mis-shapen during shipping causing the slide to stick.  Had to replace the number 4 carb body.  You are probably gonna have to take those carbs off the rack so you can isolate the problem.

[Johnie]

Loosen all 4 of the slide hold down large caps by unscrewing them a little. See if they go any easier. I had some that were not centered. I had another set that the slide bar was real dirty, but you could not see it under the sleeve.