Picked up this bike a month or so ago. Had trouble starting it and keeping the battery charged at first. Got a new battery and replaced the alternator rotor and that seemed to do the trick. Different problem now, though. It starts up ok but after getting warmed up, the bike seems to lose power or not being firing on all cylinders. Doesn't seem to matter what gear or what speed, it'll just lose power and shut off. Could be something to do with the regulator or the fuel filter? Any input appreciated.