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Throttle/Carburator 71 CB 750

Posted by KarlM on Sep 10, 2012; 2:39pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Throttle-Carburator-71-CB-750-tp4028949.html

I have a carb/idle/throttle problem. Carbs are clean and seem to be set OK but not vacuum ajusted yet!
The problem is after the bike is heated up....3-5 mile ride.  The throttle does not return to idle setting of 900 for a few seconds.  It almost sounds like I'm speed shifting. Well.....it's not quite that bad... but that helps with my eplanation. The idle only goes back to about 2000-2400-- rpm after an immediate throttle "snap". The best description I can give is the throttle "hangs up" at a higher than normal RPM and than goes back down to set idle after 10-20 seconds.   I think it's heat related because it never happens when the bike cold.  When It is cold I get the normal response with a twist of the throttle.
You guy's have been a great help in the past!
Thanks
Karl