It's hard to say based on what you are saying. Air temperature, fuel/oi mixture, throttle position, etc can all make a big difference. And there are several things you can adjust like the air screw, pilot jet, main jet, needle and slide.
It is a long read but I highly recommend reading all parts of Eric Gorr's carb jetting guide. Once you understand the basics, it's really not that hard to diagnose problems and fix them yourself. If somethin there doesn't make sense, go ahead and ask but he did a real nice job of making it simple to understand. Let us know hw you make out!
Carburetor Tuning - Intro, By Eric Gorr