I just checked out my jetting last night, (it was about 40 degrees outside), and I noticed that the chaincase side cylinder was jetted perfectly, then i took out the plug from the clutch side clyinder, and noticed that it had no color on it, looked brand new, like it had never been used, so that mean its running too lean. They both have the same size main jets and needles. I dont know what is going on. I just took the carbs apart again to look at everything, it seems fine. I also kept the 490 mains in the chaincase side (the side that is fine) and put 540 mains in the clutch side (side that was too lean) and nothing changed, still the same color! Does anyone know what could be happening??