In need of help think my carbs are out of balance.
shes lumpy, back firing, throttle dips on acceraltion and also a rattle from clutch area. Been looking on other posts and sounds like my problem.
Problem is i cant find the vacuum screws to attach my balancing tubes.
Its a x reg CBR900RRX by the way.

 

You will only have a screw on the #1 carb. The other three are a port with a rubber nipple like thing over it.