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Engine swap question

Discussion in 'XJ Technical Chat' started by matthew fitzpatrick, Aug 30, 2016.

  1. matthew fitzpatrick

    matthew fitzpatrick Member

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    Will a british 4ko 650 non ycis engine fit into a 650 maxim 5g2 xj maxim and work if i fit the 5g2 pickups and tci and run ok ?
     
    matthew fitzpatrick, Aug 30, 2016
    #1
  2. Toomanybikes

    Toomanybikes Well-Known Member

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    Should be a direct fit. Engine block is identical but for paint, only difference is cylinder and head. exhaust is same and intake as well.
    Do a valve clearance check before you install it, much easier! And run power to starter with plugs out in case engine is a bit dry. This will also make sure valves are seating well before you adjust valves.
    Only variation is oil cooler port at filter base
    Maxim never had this but if you have the cooler from the Seca, great add on.
    If not remove the adapter for cooler.
    And the maxim uses rubber dampers in the frame.
     
    Last edited: Aug 30, 2016
    Toomanybikes, Aug 30, 2016
    #2
  3. matthew fitzpatrick

    matthew fitzpatrick Member

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    Sweet but i can use the pick ups from my maxim motor cant i ?
     
    matthew fitzpatrick, Aug 30, 2016
    #3
  4. Toomanybikes

    Toomanybikes Well-Known Member

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    As far as I can tell all XJ engines use the same engine pickup units
    Checked on Yamahapartsnation and part number is the same
     
    Toomanybikes, Aug 31, 2016
    #4
  5. MiGhost

    MiGhost Well-Known Member

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    Among the 650/750 this would be correct. The 550, 900, and 1100 use different pickups.

    ~Ghost
     
    MiGhost, Aug 31, 2016
    #5
    k-moe likes this.
  6. Toomanybikes

    Toomanybikes Well-Known Member

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    True but could you squeeze an 1100 into a 650 frame ;)
    We were talking 650's specifically
     
    Toomanybikes, Aug 31, 2016
    #6
  7. MiGhost

    MiGhost Well-Known Member

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    Understood!
    And Yes! I can stuff a 900 into a 650 frame!:eek:

    Never said it was wrong. Just added a little clarification!
    Someone a couple years from now doing a research query could come across the post and not know it was specifically targeted at the a 650.
    Easier to stop misinformation before it starts.

    ~Ghost
     
    MiGhost, Sep 1, 2016
    #7
    k-moe and Toomanybikes like this.
  8. Toomanybikes

    Toomanybikes Well-Known Member

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    That's why I said 1100 because I knew you can stuff a 9 into a 650 for the ultimate sleeper , btw do you have a spare 900 motor I can cram into my xj650rj? ;)
     
    Toomanybikes, Sep 1, 2016
    #8
  9. MiGhost

    MiGhost Well-Known Member

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    No. But I have a complete powertrain (crank, rods, pistons, cylinders, head, cams) going on a set of XJ750K cases!:cool:
    900/750 engine for my Old School Chopper build. One of these days!:)

    ~Ghost
     
    MiGhost, Sep 1, 2016
    #9
    Toomanybikes likes this.
  10. Toomanybikes

    Toomanybikes Well-Known Member

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    We all have "one of these days projects"
     
    Toomanybikes, Sep 1, 2016
    #10
  11. MiGhost

    MiGhost Well-Known Member

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    You just know, a piece from here, a piece from there. Eventually it just comes together!
    Need to get the 12 over forks, and the 6 degree tree, Then I will be ready to do the frame!
    That will be when the fun begins!:):):cool:

    ~Ghost
     
    MiGhost, Sep 1, 2016
    #11

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