BIKE WON'T STAY RUNNING AFTER JUMPER CABLES ARE TAKEN OFF....
Sounds like the battery may be either low or shot. Place it on a trickle charger overnite to see if it will take a charge. Once you get the bike to run without needing jumper cables to keep it running, check the charging system. Easiest way to do this is to get a battery voltage reading with a multi meter before starting the bike. After the bike is running, place the meter leads on the battery and work the throttle to get the revs up to about 2000. Meter reading should be somewhere around 13.8 to 14.2 voltsDC. It not close to these readings, you have a charging system problem.
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