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Help COILS

Discussion in 'Yamaha 250cc In-Line 4's' started by ROVER LARRAGUIBEL, Mar 24, 2021.

  1. ROVER LARRAGUIBEL

    ROVER LARRAGUIBEL Active Member

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    Hi friends.

    According to the workshop manual, the coils must have the following resistances:

    Primary: 2.3 - 3.22 ohms
    Secondary: 12 - 18K omhs

    I measured the resistances of my coils with new NGK leads, and I have the following resistors.

    Primary: 3.3 ohms.
    Secondary: 24.85K ohms.

    In both measures they are above the nominal value.

    With these measurements my coils are ok? Or are they defective and need to be replaced?

    Thank
     
  2. ROVER LARRAGUIBEL

    ROVER LARRAGUIBEL Active Member

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  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  4. ROVER LARRAGUIBEL

    ROVER LARRAGUIBEL Active Member

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  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Did u measure the secondary the correct way?
     
  6. ROVER LARRAGUIBEL

    ROVER LARRAGUIBEL Active Member

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    I measured the cables without the caps and increased the resistance

    c0990b24-baad-4980-a15e-1b92f6209c06.jpg
    [​IMG]
     
  7. jmw76

    jmw76 Well-Known Member

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    I would not get too concerned about the primary measurement. It is pretty close and probably within the accuracy of your meter.
    With the secondary, try measuring without the leads.
    Are your leads just solid copper cables? What about the caps? Are they resistive caps? If so these typically are 5k ohm each cap. So 28k across the entire lot is not unreasonable.
     
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  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Stock FZR caps are 10K ohm
     
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  9. ROVER LARRAGUIBEL

    ROVER LARRAGUIBEL Active Member

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    Thanks
     
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