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K3 starts well but runs poorly once its warmed up

Posted by Colin Macdonald on May 03, 2013; 8:35am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/K3-starts-well-but-runs-poorly-once-its-warmed-up-tp4040210.html

I've got a low mileage (7000mls) 1973 K3. It doesn't like the choke but once its started it runs really smoothly for the first 5-10 minutes. After its warmed up well it idles fast and is hesitant coming back onto the throttle. I've stripped and cleaned the carbs, set timing carefully, checked tappets. Haven't changed plugs or looked at needle heights in the carb bodies.
Anyone got any helpful clues?
Cheers, Colin