My Xciting 250 won't stay started. It cranks like a champ, and will actually catch and run - for 1-2 seconds. It will do this 100 times if the battery holds out that long, but it will not stay running. It's not on the kickstand or center stand, and I'm holding the brake. It happens the same whether or not I apply throttle, although it does better with no throttle. When it does catch, it dies fastest if I try to apply throttle at any level. Oil level looks good and it's clean. The tank was low - I added clean fuel, that didn't help. Doesn't seem like the spark plug, because it does run for a few seconds, right?
Possible factor: Last December my wife dropped it. I picked it up after about 2 minutes, and it started right back up and she rode it home. It then sat idle for 6 months till I tried it last month, then this problem was observed. I figure if it started fine right after the drop, nothing about the drop could be a problem now, but I don't know.
Any ideas?