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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.

Thanks.

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Make sure that the carb boot is tight and no cracks..

Spraying starting fluid around the seals will help you locate the leak.
 
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