Working on for a friend. New carb, intake box, and fuel lines. When accelerating @ 100%, motor lags around 25 or 30mph for about a second before continuing up the power curve. Can accelerate with up to 75% throttle with no problems, only at 100% does the problem occur and from a stop or slow roll. Motor doesn't seem to miss or cut out, just lags like it is not getting enough/too much fuel.

Thanks for any help.

 

sounds like the needle hight needs raised.. if i remember thats what controls the midrang ..but i also tend to be full of my self