Performed carb work on my 2000 500XC over the weekend to remedy needle and seat leak. Dropped the pilots one size while I was in there. Did a few plug chops at around 20 degrees F or so and I noticed that one cylinder seems to run richer than the other with the same carb settings. This was at 1/4-3/8 throttle or so. I am not real worried of burning it down with this color, but was wondering if you guys think I need to start looking for an air leak before I toast a piston when it gets worse. The difference seems to carry across all speed ranges, so it isn't just one carb setting. Top one is mag side, bottom one is PTO.