CB77 slow to return to idle

[maia]

I have looked in past posts for some help with this one but couldn't find any, hope you can help. My '63 restored Superhawk has about 200 miles on it and I'm finding it a litttle slow to return to idle from around 2500-3000. This was not here in the beginning and has just come about in the last 100 miles or so. I'm certain it is not the cables or slides hanging up, looking into the carb throats show them snapping shut. I've checked for air leaks around carb to aircleaner . Adjusting the air mixtue screws out seems to help very slightly. Weak advance springs? The bike runs great otherwise. Thanks for any advice.

[maia]

Checked with Bill Silver and he suggested air leaks from carb insulators from perhaps overtightening mounting bolts or weak advance return springs and to make sure timing is spot on at F and LF. Replaced my carb to filter tubes with new CSM replicas to eliminate that possibility and remember slightly tweaking the advance springs during assembly to avoid any slack in the mechanism so that seemed out, checked the static timing at idle and sure enough it had gone out slightly ( the rebuild has 200 miles on it ) reset it, problem solved. Hope this info is of use to anyone who finds themselves with the same problem.