Is the Idle mixture adjustment on a butterfly Keihin carb,(not CV) as found on say a 79 sporty, get richer as you back the screw out? That is turning it counterclockwise? And is turning it clockwise make the idle mixture leaner?
Got called to look at a bike a friend was working on, and it would barely run at idle. It had the rubber "bands" to seal the manifold, not "O" rings. They were loose, and the custom clamps weren't doing a good job of sealing. No, I didn't have any way to do a manifold leak test. Anyway, tried to install "O" rings, but the custom clamps wouldn't clamp down tightly on them, they were meant to fit a larger diameter, such as you have with the rubber bands. So, I installed a new set of rubberbands, and did the best I could lining up the clamps to seal.
With new rubberbands it runs but the idle mixture screw needs to be out about 3 turns to get a halfway decent idle.
So, I need to know if we're making it richer to get it to run, leading me to believe there's still a manifold leak.
Also, I'm thinking this bike came with "O" rings originally, anyone know for sure?