Ok, So I bought this bike from a guy who lived at around 8000ft. I am at 5500 ft. I rode it twice at local motocross tracks, then decided to tear it down to baseline all the maintenance. I have no idea when this was ever done, and am beginning to wonder if this was the 1st top end done on this 2005 bike? I think this looks bad?? The jetting is 172 main, and a 45 pilot. I would think that would be a little rich for 5500 feet, any opinions by looking at the head? Spark-plug is black, but the center deep electrode is brown. The cylinder looked fine, with crosshatching still very visible. No scores or anything that would catch my fingernail. Any opinions? Facts? Laughs? Thanks in advance!