I finally got my sled back from having the carbs tuned. After gutting the air box, installing two SLP 2" flowrites and an Airhorn kit, the mechanic went up one size on the pilots, raised the needle one clip, and went up two sizes on the mains. He said the propper way to check the jetting was to go 1/4 throttle for a couple blocks, lock up the track and hit the kill switch at the same time, and then check the plugs for a light tan color; And to repeat the process for 1/2 throttle, 3/4 throttle and full throttle. My question is this. The spark plug closest to the clutch is consistantly lighter in color than the other plug. I noticed this last year even before all the intake mods. Is it normal to have one plug ligher than the other, or should I just keep turning the air screw until on the carb to make the lighter colored plug match the other plug?