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Vstar 1100 Cuts out when riding

Discussion in 'Technical and Troubleshooting Torque' at netrider.net.au started by dawg007, May 22, 2012.

  1. Hi Guys,

    Having a problem with dads vstar 1100.
    the bike starts up fine and after it warms up it misfires and then stops.
    When this happens the dash lights, odometer dont light up. Keep it for a few minutes and things slowly start to come up. Even jump starting at this point doesnt work, but works fine when cool.
    Hooked up a multimeter.
    11.5 volts when stopped, 13.5 when started so looks like the alternator is working.
    Also when the bike stops the volts are low at about 8 and then slowly goes back up.

    Any idea what could be the cause?

  2. Re: Vstar 1100 Cutus out when riding

    Voltage that low will probably stop the bike, so the stopping is a symptom of an electrical problem I would guess. Maybe battery is dead and has a high internal resistance. This would allow the voltage to rise when it is charging but it wouldn't hold a charge.

    less likely would be a heavy short loading the voltage of the battery down. Generally this would blow the main fuse however so it is less likely. Another less likely fault is regulator not proving enough charge current.

    I would try charging the battery on an external charger until it is fully charged then try in the bike. If it gets the problem immediately it is probably battery, if it is after a while running then you need to look more at the charging circuit.
  3. Also interesting is the fact that after it has stalled the voltage is low, but leave it alone and it automatically goes up...:S
  4. Could it be a faulty pickup coil as it fails when its warm?
  5. Those numbers don't look good for the battery. Putting it on a charger will confirm if it's the battery itself.
  6. Chared the battery bup and it looks like its holding charge at about 13Volts