40mph?????

Thanks guys.

Yeah... I found that my bike runs best "LEAN" with the needle all the way down, (c-clip at the top)
I also "port matched" the intake manifold & exaust pipe to the cyinder ports for better flow.
Try a 36-T rear sprocket.

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To adjust the cable- Unscrew the cable housing adjuster lock nut at the top of the carb almost all the way, turn the cable housing adjuster in until there is a little freeplay in between the cable housing and the cable housing adjuster.

Gently unscrew the cable housing adjuster until it makes contact with the cable housing and then screw down and lock the cable housing adjuster lock nut.

Adjust idle with idle adjustment screw.

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If it ain't broke, and you mess with it long enough, it will be.

These carbs definitely give some room to fine tune your running.

I ran mine both lean for awhile, and I liked the way it ran smooth in the mid range. It just seemed to be a little too lean when under load or at 3/4 or higher throttle. I was worried I smoke something, so I went back to "a little too rich" which is where these engines were designed to be run.

If you do run lean, I would suggest a castor or castor blend oil fo' sho'.

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If it ain't broke, and you mess with it long enough, it will be.