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Is it rich at idle?
Rich in mid-range?
Rich in high-end?
Each is separate adjustment. If rich across board, you'll want to measure float-height and do wet test.
These are bikes that put out 150-hp/ltr, so everything is extremely precise. Tolerances in engine are measured in 10,000th of milimeter. Fueling from carbs has to be particularly accurate. Doesn't take much to throw them off: single grain of sand, tiny crack in hose. Loose hose-clamp, 2-drops of dried petrol, etc.
You'll also want to verify last time valve-adjustment was done. Wouldn't hurt to double-check and adjust them on looser end of range.
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