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what is this tiny little chain behind the flywheel?

Discussion in 'XJ Technical Chat' started by apsolus, Nov 2, 2010.

  1. apsolus

    apsolus Member

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    it appears to be for the oil pump im guessing. my bike is an xj 750 midnight maxim 83. is this chain supposed to be really loose? i have about half an inch of play in it
     
    apsolus, Nov 2, 2010
    #1
  2. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    It sounds too loose to me. Can you replace it. The parts book shows #25 chain and 64L which I would think is links.

    MN
     
    MN-Maxims, Nov 2, 2010
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  3. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    It is the oil pump drive chain and I don't know how much slack is acceptable.

    Good question.
     
    bigfitz52, Nov 3, 2010
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  4. RickCoMatic

    RickCoMatic Well-Known Member

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    Have a close look at the Pump and Drive Sprockets.

    A "Slack" condition in the Oil Pump Chain generally means that the Pump Assy Sprockets may be worn.

    There isn't much written about the Oil Pump other than: "If the Pump or Component Parts are damaged, ... replace the entire Assembly."

    The YamParts Site shows the Pump Sprocket as a separate Part.
    5G2-13355-00-00 SPROCKET, DRIVEN

    (( The condition of the Oil Pump is one of the "Indicators" to how well the Bike received periodic maintenance. Premature Oil Pump problems and Timing Chain related problems usually means the Bike went without regular Oil Changes. ))
     
    RickCoMatic, Nov 3, 2010
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