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Dirtbike Stator

Discussion in 'General Electronics Discussion' started by spinisr, Nov 8, 2010.

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  1. spinisr


    Nov 8, 2010
    Hey everyone - new guy here,

    I own a Honda XR200R dirtbike and I'm currently in the process of customizing a headlight. I

    purchased a generic headlamp housing from autozone and a generic 65watt halogen bulb. A

    negative and positive wire come out of the dirtbike's 12v stator so I simply connected them

    to theheadlight. The headlight works great except there is one problem. When the engine is

    idling the bulb goes dim and when I reach full throttle, it's extremely bright. What do I need to

    install (besides a battery) to keep the bulb steadily illuminated :confused:

    Thanks !!
  2. Resqueline


    Jul 31, 2009
    You need to use a bulb that matches the spec's of your dirtbikes stator. Any idea what the original lamp(s) were supposed to be?
    A permanent magnet dynamo delivers a constant current, with a voltage only limited by RPM.
    Your bulb draws 65W/13.5V=4.8A.
    Lets say the stator was made for a 6V 35W bulb. That's 35W/6.8V=5.2A.
    Thus the stator overpowers your 65W bulb by 8% (counted in Amps) as soon as the RPM's allows the voltage to pass 14.4V.
    8% may not sound like much but a bulb has a non-linear current/voltage relationship (it's draws an almost constant current, relatively independent of voltage).
    I don't remember the exact relationship but more current results in a much larger voltage increase, and thus an even larger than that again power increase.
    If you want to use a high-power bulb then you need a rectifier/regulator/battery setup to deliver juice at low RPM's.
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