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What jetting do you have in it now? I assume you have owned the bike since it was new?
By saying "everything is stock", I assume you are talking about the bike and not just the carb, yes?
What are you running on your mix ratio, and has there been aby severe weather changes or altitude changes such as a move from one state to the next?
When was the last time you checked your exhaust system and repacked your silencer?
You could have a clogged jet, or a bad jet in it causing an issue, or even all the way to bad packing as I have seen it cause a few issues. If the issue just started, it could be due to colder weather or you may have another issue such as old gas/oil mix, or even a dirty filter causing the bike to run rich as it is restricting air. If you have recently changed exhaust systems it can cause lean to rich issues depending on what you changed as well, but if not...*shrugs*.
Check your air filter and make sure it is clean, and make sure your carb is set to normal/factory specs before you go any further. Also make sure you have fresh fuel ad oil, and make sure the silencer does need repacked. Carbs can be a pain even if you know what you are doing. I had an issue with my '06 YZ125 that drove me nuts for awhile, and I finally got it sorted, but it still ticked me off. Hahaha!
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