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Xj 550-ish?

Discussion in 'XJ Technical Chat' started by Mipeko95, Aug 9, 2021.

  1. Noahsxj

    Noahsxj Active Member

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    So you have a maxim with a seca motor, and a stock one at that.
     
  2. Mipeko95

    Mipeko95 New Member

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    Is there anything worth improving from stock? Not necessarily performance wise, but any specific issues or things I should be aware of with a goofy swap like how you say?
     
  3. Noahsxj

    Noahsxj Active Member

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    Honestly the more stock the better, they’re identical besides jets in the carbs I believe.. as far as the motor goes

    I’m also not sure what other surprises lie within that build..
     
  4. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Camshafts are also different in the Seca motors.....higher lift, probably more duration.
     
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  5. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Where was it determined that the engine is out of a Seca model? The only way to determine that is to look at the machined pad, on the upper engine case, that has the original bike's ID code and last 6 of its serial number.
     
  6. Mipeko95

    Mipeko95 New Member

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    So I could assume coil size, plug gap, cap resistance, and some other things would be different from maxim to seca?
     
  7. Mipeko95

    Mipeko95 New Member

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    Would that be this?
     

    Attached Files:

  8. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    No, that is the cylinder jugs size indication, 550 engines actually displace only 528cc's. You can read more about the various component (and engine) ID at:

    http://www.xj4ever.com/catalog/frame-engine-id.pdf


    All of those items are the same between all XJ550 models.
     
    Last edited: Aug 9, 2021
  9. Mipeko95

    Mipeko95 New Member

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    Oh ok awesome thank you very much! I'll get that tomorrow and continue the quest from there :)
     
  10. Noahsxj

    Noahsxj Active Member

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    I definitely assumed, but only the secas came with the the factory black painted motor right?
     
  11. XJ550H

    XJ550H Well-Known Member Premium Member

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    no like left to right the spacing is wider on the 750 from center of bore to center of bore
     
  12. Thrasher

    Thrasher Member

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    Doesn't the 550 have a shorter stroke than the 600's?
     
  13. Simmy

    Simmy Well-Known Member

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    it does

    550
    528.5 cc
    57mm bore x 51.8mm stroke

    600
    598.5 cc
    58.5mm bore x 55.7mm stroke
     

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