hey sorry if this thread is already up here but i need to clerify whats goin on...my bike will not idle under 4000 rpms at all at any point when its cold or when its warms i have not ridden this bike yet..trying to get there...but when she warms up i try and turn the idle screw down and she will start to idle down then immidetly turn off? whats going on????? i am a total newb to bikes...i have tho removed the jets and cleaned them with laqour thinner and put back..same with float valve also...tanks for your help..

 

This has been asked a million times and your answer is already on the board.

Take the carbs back off the bike and clean them like this:

https://cbrforum.com/forum/cbr-600f4...8/#post1022025

The passages for the pilot circuit are very small...and soaking jets in lacquer thinner probably won't do the job.