bauging out

[davomoto]

Did you install the needles from the Keyster kit? If so, try putting the origional back in.

[LOUD MOUSE]

The needles from the KEYSTER CB77 kit are good. ...........lm

Did you install the needles from the Keyster kit? If so, try putting the origional back in.

[jensen]

Hi Chico,

There's (probably) nothing wrong with you bike. Like LM and others say, these carbs (no vacuum controlled slide) should be opened gently at pick up.

The reason behind this is that the mixture gets extreme rich / lean when opening the throttle, and that mixtures doesn't burn. There are several reasons for this effect, one of the reason is that the air speed in the carburetor is not going up linear when opening the throttle. The advance mechanism is also a reason.

Look at the dyno run below, and you see the effect of snapping the throttle. look at the air / fuel ratio, and you will find the reason. There isn't a magic setting or jetting to overcome this effect.

[chico]

I got it pretty close. On normal start ups, driving it , it runs good and gear changes throttle response is good. Thanks bros for your help.