I just did the reed notch mod (what a difference in throttle response!!), while I had the reeds out I noticed that on cylinders 1 and 2 the crank on the right side of each of these, I believe they are crank number 2 and 4, have some blue discoloration to them and I am concerned that something may be getting too hot. The sled runs great with 3800 trouble free miles but could I be running a bit to lean or is this common and nothing to worry about. I appreciate any responses