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Join Date: Jul 2006
Location: Kennett Square, PA
Just to elaborate on Jon's point: our batteries get recharged by a stator and regulator system that kicks into action only above a certain level of rpms (2500 or so). Below that, the motorcycle is largely operating off the battery and will do so until the battery conks out.
So you'll want to grab a voltmeter and test the voltage at idle (should be about 12.7 v), and then increase the rpms to 2000, 3000, 4000. By the time you hit 4000, your voltmeter should be reading 14.5 v or so (now your motorcycle is running off the battery and the voltage being produced by your charging system, but there's ample voltage to replace what's being lost by the battery).
If you're tendering the battery overnight and it's not getting up to working voltage (i.e., 12.7v), I'd suspect the battery itself. If you can get it charged, get it to start the bike, but it loses the charge in short order, suspect the charging system. It's a common problem with these bikes, so holler if you need any help with this.