So I pulled my dirt bike out from winter storage (my garage) today, and after a dozen kicks it started up. I would idle and rev just fine, however... when I pull in the clutch and try to rev it, it stalls out. I can pull in the clutch without reving it and it will continue to run at idle. The bike is not in gear, and was running just fine when I put away for the winter (had 2 rides on a ultrasonically cleaned carb too). Stored with gas stabilizer. Any ideas out there? This doesn't make sense to me.