Predator212 won't idle all of the suddem

#1
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It's a 212cc non-hemi with the governor (half?) disabled by unlinking it from the throttle linkage. It has a stage 1 kit (jet, emulsion tube, air filter, header pipe). It was running and idling great, and an hour later when i went to start it, it wont idle (it wont stay running under quarter throttle). Adjusting the choke and muffler don't fix the situation. The tank is pretty full.

The only change that was made to the bike, was i made the chain pretty tight this morning. I don't think that's a problem since it's a torque converter and it was idling fine shortly after i tightened the chain.

What could be suddenly causing this problem?

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#3
The engine is only a few months old, less than a couple hours on the engine. The carb bowl still looks clean. If I can't figure out this issue I think I'm going to buy a new mikuni carb.
 
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