I agree it is very likely too rich. Anytime you get sputtering and not revving cleanly you're usually rich. I also describe it as "breaking up", like running with the choke on. Do what Jakobi says and pull the choke on when running. I'll bet it gets even worse.
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2011 Gas Gas EC300 38mm, 2008 Husky TE610, 2003 Beta Rev3 250
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