Topic: hesitating @ 4000rpm

[Aaron Richard]

ok, I've been dealing with this for a bit now. Bike runs pretty well but, when I'm cruising along easy on the gas at 4000rpm it starts to break up on me a bit. what could cause this? I have no air leaks, new boots, valves adjusted correctly, timing good, all new plugs wires and coils,  dyna ignition.

[Duke McDukiedook]

Stock airbox, pipes, and jets?

[Aaron Richard]

pods, mac 4 into 2 and 110 jets

[Duke McDukiedook]

Might have to bump up the size of your jets.
Someone on here might have the same setup and be able to help you.

A plug chop at 4000 would tell you what is going on.

[Johnny5]

Which bike/year? What's the current jet sizes and needle position?

[Aaron Richard]

1975 cb550 . it has 110 mains 40 slow and 3 or 4 clip.

[Simpson]

Sounds like your Air/fuel ratio is off.
+1 on examining your jetting.
i would move the needles to see where it runs better to get an understanding if its a lean or rich condition.
Or just do the plug chop like advised.