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?