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Help identifying crankshaft XJ650 or XJ750

Discussion in 'XJ Technical Chat' started by thanos12, Apr 16, 2025.

  1. thanos12

    thanos12 New Member

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    I found a new crankshaft within a storage and I do not know how to identify it. Any ideas? Images attached. (Maybe also from Xj900 ?)
    Thanks.
     

    Attached Files:

  2. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    There should be casting numbers somewhere on the crank (on the throws or the other non-machined areas) which may help in identification.
     
  3. Dan Gardner

    Dan Gardner Well-Known Member Premium Member

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    Stroke len:
    XJ650: 52.4mm
    XJ700: 52.4mm
    XJ750: 56.4mm
    XJ900: 60.5mm
     
  4. thanos12

    thanos12 New Member

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    I have already search them no results. Images with numbers attached.
     

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  5. thanos12

    thanos12 New Member

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    Many thanks for your kind info. Is there anything that I can measure on my crankshaft in order to verify the future stroke len? Thanks.
     
  6. Dan Gardner

    Dan Gardner Well-Known Member Premium Member

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    A little tricky to measure, but the concept is simple. It is the difference in position from TDC to BDC of one of the piston journals:
    upload_2025-4-16_11-41-1.png
     
  7. thanos12

    thanos12 New Member

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    Many many thanks I will do it and I will reply. Thanks!!!!
     

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