What the foc???blocked jet???

[bozboz]

I had a similar problem with on an old cb500 work bike. Spent days taking the carbs apart cleaning, refiting, mucking about with the float levels, etc, etc! Always one downpipe was running cooler with low speed stuttering/hesitating but accerated fine and the heat came through with the acceration. My problem in that case turned out to be solved with new HT leads!
If that fails my friend Dave at TSR may be able to solve your problem, he can clean the carbs ultrasonically and vapour blast them -very thorough come back looking new!!! This may clean an internal part that the carb cleaner just cant shift?
Heres a link, hope it helps:
http://www.tsrvapourblasting.co.uk/carb_cleaning.html

Cheers BozBoz