It seems like no matter what I do, I cant get the carburetor set up right on my 426. The mid and top end seem to be strong but the low end off idle has been a major problem lately. I have an external idle mixture screw installed and it seems like it constantly needs adjusting to get a crisp throttle response off idle. I know your not supposed to abruptly open the throttle while the bike is on a stand, but I feel like I sshould have much better results than I currently do. Anybody want to chime in on experience with this?