I get this call at least once a day. Guy calls up, my carb isn't working well, stumbling, bog, hesitation. When I go to full throttle it stumbles really bad, surges at cruise, or whatever.
One of the FIRST questions I will ask is if you rebuild the carb and if you used one of our kits in it?
Almost every single time I get a "I just rebuilt it or had it rebuilt" and no we used a kit from NAPA, Pep Boys, or some outfit on line, etc.
My next recommendation will be to get one of our kits, replace all those components, install a new secondary cam/spring, and see if things improve.
If not call me back and we can go over a few things that you might have missed or need to do to correct the problems.
So basically it's difficult for me to diagnose a carb issue on the phone IF you didn't use good parts in it, incorrect parts, etc. Once I know that the carb has the correct parts installed, float adjusted correctly, and it still doesn't work right, we know it's either a fundamental issue with the carb, or something was missed during the rebuild......Cliff