carburetor tuning

 I have a 1976 CB750F with a Keihin CR-Special.  When I first bought
the carb and installed it on the bike it ran good even though the
mixture was pretty rich.  The bike sat in outside storage for a couple
of years and gained some oxidation.  I took the bike apart, including
the carbs, to clean up the corrosion.  Now I can't even get it to idle
right.  When I took the carbs apart to clean them up I replaced the
slow jets so that it would run leaner.  I don't know what I did, but I
have replaced the jets and tried all combinations of slow jets and
needle jets.  The best I get is idling at 1200 with the air screw
completely closed which of course makes the mixture very rich.
Because it is idling rich I put smaller slow jets to lean out the
mixture.  The smaller the jets the higher the idle, especially if the
airscrew is open.  I have to have the airscrew completely closed to
even get close to a normal idle.  turning the airscrew even a half a
turn counterclockwise (leaner) makes the idle run away up to 4000 to
5000 rpm.  But if I put larger jets which richens the mixture, the
idle slows down, but I still have to keep the airscrew closed or the
idle runs up to 4000 rpm.  Does anyone have any ideas?  What am I
missing?

Please help!
tjbabar

 Try this forum. Lots of knowledge there.

http://www.hondashadow.net/