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Throttle / butterfly shaft vacuum leak

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I'm working on a 92' honda cb750 nighthawk with keihin CVK carbs.

I found a vacuum leak on 1-2 & 3-4 throttle shafts.

I found the felt seals and replaced them:


The 1-2 leak disappeared, however the 3-4 is still there.

First off, the throttle shaft rides directly on carb body, no bronze bushings what so ever. Also, I think these felt seals are a joke. The body & shafts seems tight with no major play.

I'll try to open the idle mix screws on problem carb one turn.

I also may try to ditch the felt seal and put in some o-rings.

Anyone else have this issue?



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