Does it bog down and quit or rev higher and quit?

If its bogging down your low speed needle is too rich and when it sits idling it loads up with fuel and quits when you gas on it. If it starts to idle higher the low speed needle is too lean. when tuning the Low speed needle(its located on the carb arm) you can turn it in 1/6 increments its alot less touchy then the high speed needle.

Then test it out do a high speed pass then come to a stop let it idle for 6-7 seconds and gas it if it bogs again lean it out a tad more. Make sure not to lean it too much overheating can be caused by both a lean high speed needle as well as a lean low speed needle.