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Need help with power loss issue

Discussion in 'XJ Technical Chat' started by Xj900rk-nightrider, Aug 16, 2015.

  1. Xj900rk-nightrider

    Xj900rk-nightrider New Member

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    Location:
    Canada
    1983 yamaha seca xj 900 rk

    Bike was ridden in the rain yesterday and for some reason doesnt feel like its got that top end power band anymore
    Back fires and revs out before putting out

    Change plugs tests plug caps for resistance
    Volt meter tested coils

    Both at 12.5

    Anything else i could try
     
    Xj900rk-nightrider, Aug 16, 2015
    #1
  2. wink1018

    wink1018 Active Member

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    Have a look at your carbs.

    Pay close attention to the cleanliness of the fuel jets and emulsion tubes. Also, verify your fuel levels in the bowls.

    I'm betting you are running lean on the top end.
     
    wink1018, Aug 16, 2015
    #2
  3. Xj900rk-nightrider

    Xj900rk-nightrider New Member

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    Ive also had the carbs and valves set recently too
    So im just stuck but it back fires or over combusts so im not sure whats going in
    This is still the conclussion even tho i rode in the in rain and ot acted up than went away, but today has come back?
     
    Xj900rk-nightrider, Aug 16, 2015
    #3
  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    More like you have cracked plug wires, caps, or coils. Start her up in the dark and see if there is a lightshow.
     
    k-moe, Aug 16, 2015
    #4
    rocs82650 likes this.
  5. Xj900rk-nightrider

    Xj900rk-nightrider New Member

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    Hey thanks man i took the caps off and test them the resistance was equal all around i test the coils seemed good still didnt run fine, i left for a few hours came back started it up n it was mint,

    If i start it uo in the dark and everything seems fine, where can i look back to if j run into the problem again
     
    Xj900rk-nightrider, Aug 17, 2015
    #5
  6. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    Mist the plugs and wires with a trigger sprayer lightly in the dark. You will see a lighting show more than likely. Also pull your gas tank and see if the coils have cracks in the plastic housings. I just upgraded one of my bikes for this very reason to Dyna Coils from xj4ever.
     
    MN-Maxims, Aug 17, 2015
    #6

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