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Discussion Starter #4
Is this the same spot, just above the vacuum line?

https://i.ytimg.com/vi/6H5vESUSPVc/maxresdefault.jpg

If that's it, there's an E-clip (retainer) there. Part of the enricher (choke) setup? Does that shaft turn when the choke lever is moved?
That's the spot. The e-clips are there, and I can turn them, but I'm not sure if that does anything.

The entire shaft rotates when I roll on/off the throttle. Doesn't seem to rotate with the choke.
 

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Oh hell, for some reason this is always easier when the parts are in my hand.

That's the shaft for the butterfly! Butterfly is the 'flap' that flips open when you twist the throttle.

So it's loose and pulling air through there. You found the vac leak. The fix is another story. I'm afraid it may be easier to get another carb.

When this happens on an old car, we get new bushings for the throttle shaft. I just don't know if that part is available for this carb. Throttle shaft bushing ... might check for that at Ron Ayers or Partzilla, just to see if they have it. Rocky Mountain ATV is another. Arctic Cat uses the same carb. Maybe it is available, just saw a listing for a KZ750.

You should plan on replacing them all. How many miles on your bike?
 

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Not shown at Partzilla. You'll know you've found it when you can see the throttle shaft in the drawing.
 

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Discussion Starter #7
These bushings/fittings seem difficult to find, and apparently their failure is very rare.... And somehow I bust both....

I'll check again to make sure it's not my choke plungers letting air in, but for now, I put blue silicone around the bushings, haven't sprayed yet, but seems to run a lil better....
 
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