Reply To: 2007 GT250R – carb help [Solved]
it could be possible you have sticky slides that wont go above a certain RPM
Have you tried this mod below?
[How to Tutorial] Adjust Carb Slide Needle (Tuning) Hyosung GV250 GV125 GT GT125R GT250R
Least you want to investigate the needles are also not getting jammed inside the Needle_JET tube (brass) , as the more revs you need, the higher the slide must lift for air passage and fuel to leave the main jets.
Not unless the the skeleton of the carb itself , needs compressed air (again yes)
This is the closest video that explains what part of the carb is activated and gives you more pointers to look for
(Video is only viewable on youtube, due to the uploader making it that way)