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Thread: Stator output

  1. #1
    Junior Member san_mas's Avatar
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    Hi All,

    I need some real life numbers from you guys.I need someone to disconnect the stator wires (the 3 white wires in the connector)and tell me what the voltage output is at idle and at about 5000 rpm.This is done by connecting the voltmeter(on volts ac) between the white wires only.Also,the ohms between each of the white wires.Have been trouble shooting a non charging system and am pretty sure its the stator.Purchased bike this way so no telling what may have happened.1991 with only 988 miles.Not sure if a bad battery may have fried the stator.Thx in advance. Vmaxer

  2. #2
    Senior Member Dave Nafziger's Avatar
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    Vm-

    Every white needs to read .32- .39 Ohms to every other white. If there is a short in the insulation between the stator and connector you will have

    bad figures. I hope you do; that's getting off easy. Worse things can give you bad readings here. But I don't think a low battery would hurt your

    stator.

    In the Yamaha Manual, Supplement, for 88 and up, it gives a chart for output in amps, and says at about 1500 RPM output should be 1.5 or less;

    at 5000 RPM 11 or more. And it is an A.C. unit. In the main section, for the unique 87 model it gives output at 5000 RPM at 14 volts. I have my tank

    off right now; maybe later I can help more.

    -GB

  3. #3
    Junior Member san_mas's Avatar
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    Greybeard,

    I'm seeing .6-.7 ohms at idle.Yamaha tech said I should see 35v at idle and 75v at 5000.I'm seeing 11v at idle and 50-52v at 5000.35v at idle seems high to me.Can't find any publications to back these numbers so next best is rael world numbers from a properly running bike. V

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  5. #4
    Banned qwerty's Avatar
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    You are testing resistance (ohms) with the engine running?




  6. #5
    Junior Member san_mas's Avatar
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    No,that was a mistake.Still need to know voltage though.

  7. #6
    Senior Member Dave Nafziger's Avatar
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    Vmaxer-



    I would test the individual Whites for resistance because it is so easy. And I would listen to the Yamaha tech and not say anything, because I would guess that maybe his concept of idle and mine are 500 RPM or more different, and that's probably a lot of output difference. Also the newer bikes

    without kickstarters and 55 watt headlights have higher output stators, and this may have been his reference. Or another bike, maybe?



    Where did you get the .6-.7 ohms figure? This wasn't between Whites was it?



    GB

  8. #7
    Junior Member san_mas's Avatar
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    Greybeard,

    I agree,the testing procedure for both is quite easy.Here is what I am doing.Most publications say test ohms at the lowest ohm setting or 2k.My voltmeter has a 200 setting,if I use the 2k I get no reading,but at 200 each white wire(3)read 0.6.Ithanswitch to volts,start the bike,and again check each white wire at idle(approx 600 rpm).Reads 12.7 across each wire.If anyone else can do these easy step and tell me what the see I would appreciate it.Also,at 5000rpm I am seeing about 52 volts. VM

  9. #8
    Senior Member Stromper's Avatar
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    Well you lost me



    Bike runs on DC except maybe headlight but is 12Volts DC so must be checked on DC Volt Scale



    Stator winding make AC so must be checked on AC volt scale



    Resistance is measured in OHMS with nothing running



    Resistasnce from coil wires to the ground negative battery terminal should be VERY HIGH like meg ohm

    or just show it as an open circuit



    Resistance from coil wire should be the value specified



    If very high its broken or connections are bad



    If lower than specified than some wires are shorted out to each other so bad

  10. #9
    Junior Member san_mas's Avatar
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    I understand the bike is DC.I am only concerned with the voltage output of the stator disconnected from the bike while running.And the ohms of the stator disconnected from the bike and not running. VM

  11. #10
    Junior Member san_mas's Avatar
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    The AC voltage output.

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