Had the bike around the car park today and it runs well except the problem is still there with the carbs. if left to idle the bike will idle for a few seconds and then slowly start to drop off and stall. If I grab the throttle before it stalls its ok it will pick up again and when revved after about 2500 it revs clean. Below 2500 however it just labours and is like its out of fuel. After it stalls it wont start again without some serious stuffing around.
When I rev the bike it holds on to the revs like the pilots are blocked then drops back down. I put three fingers into the intake of the airbox when running and it is nice and crisp then doesn't hold the revs and is responsive, about 80% blocked off. I blocked off the intake and rode it but no good. I have raised the needle two and gone up on the main from 230 to 240, no difference.
I can here it sucking air in the airbox and struggling like its too lean.
Anyone got any suggestions because I have had enough for today