THESE CARBS ARE VERY TUNABLE! YOU HAVE 4 TUNING ITEMS, FIRST THE AIR SCREW ON THE SIDE, THAT WILL WORK AT IDLE AND JUST ABOVE NEXT YOU HAVE THE PIOLET JET NEXT TO THE MAIN JET INSIDE THE FLOAT BOWL, THAT COVERS ABOUT THE FIRST QUARTER THROTTLE. NEXT YOU HAVE THE NEEDLE IN THE SLIDE THAT COVERS FROM ABOUT QUARTER TO THREE QUARTERS THROTTLE, YOU RAISE OR LOWER THE CLIP TO RICHEN OR LEAN AIR FUEL (UP IS RICH DOWN IS LEAN) AND THAT WORKS OFF THE MAIN JET. THE NEEDLEPULLS AWAY FROM THE MAIN SO THE MAIN AND NEEDLE WORK TOGETHER. THE MAIN JET IS THE LAST QUARTER THROTTLE.
THERE IS OVERLAPPING OF THE JETS SO BY GETTING A JET CHART YOU CAN SEE WHERE YOU NEED HELP. A GOOD TUNING BOOK, LIKE THE ONE JEFF SUGGESTS CAN HELP YOU TO GET IT RIGHT WITHOUT SPENDING A TON OF MONEY JUST GUESSING!
TO ANSWER YOUR QUESTION TRY RASING THE NEEDLE 2 (THAT MEANS DOWN TWORDS THE POINT) IF THAT GETS BETTER, DEPENDING ON WHERE YOU ARE AT ON THE NEEDLE YOU MAY NEED TO CHANGE THE MAIN AS THEY WORK TOGETHER.
I HAVE TUNED ALOT OF 2 STROKES, IF YOU BREATH AT THEM WRONG YOU CHANGE JETS! (AT LEAST TO KEEP THEM FAST)
HOPE THIS HELPS!