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XJ600 engine in XJ400?

Discussion in 'XJ Technical Chat' started by xj400gr, Apr 7, 2013.

  1. xj400gr

    xj400gr New Member

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    hello everyone! i have a 1982 xj400 seca. will a 1984 xj600 engine fit in the frame of my 400? will i need any other modifications in the electrical system or anywhere else? does anyone know for sure? plz help me
     
  2. Orange-n-Black

    Orange-n-Black Well-Known Member

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    Hello and welcome. I don't think anyone's done that before. Not real familiar with the 400 frame and how the motor mounts. Does the motor hang from the frame like a Virago or is it cradled like the 550/600/650 Seca/Maxim?
    If it's cradled and there's enough room in the frame for it to fit, then it could be done with modifications to the motor mounts. If the motor hangs from the frame it would be easier to mount. Would use the 600 wiring, TCI and other components.
    Hopefully some one with more knowledge of the 400 will come along soon and tell you more. 8)
     
  3. xj400gr

    xj400gr New Member

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    the frame and motor of my 400 (4v7) are exactly like the 550 seca. some people who sell motors told me that i can use the xj600 motor without any modifications in electrical, with the carbs from 400 (bs28). i have seen xj550 with xj600 motor on but i dont know if they changer the wiring :? . my motor has problem in the crankshaft and the only motor i can find is from xj600. i must be sure it fits so i can buy it! thank you for your information :)
     
  4. Orange-n-Black

    Orange-n-Black Well-Known Member

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    The later model 600 motors had cylinders that leaned slightly forward(don't know what years), so check for that. The 550 had bs28 carbs as well, not sure about the 600, 650 had Hitachi 32's, 28's might work with a re-jet.
    About the electronics, I would check on XJ4ever's catalog for matching numbers. XJ4ever is at top right of the page.
     
  5. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    Is the 600 a "cable tach" motor??
    Your stock exhaust might be a bit restrictive too - (maybe?)
    +1 on the above advise.
     
  6. mtnbikecrazy55

    mtnbikecrazy55 Active Member

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    If the 600 doesent have the mechanical tach, you can wire up an electronic tach no problem with a different tach gauge.
     
  7. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    NO, it won't fit.

    The 4-cylinder XJ600 motor mounts in a cradle frame, just like the 550s.

    The motor on the 2-cylinder XS400 is PART of the frame; the motor pretty much hangs from the frame and forms part of it.

    It would take MAJOR fabrication to figure out how to even mount it.

    Now if your 400 Seca is a FOUR cylinder, it might just work.
     
  8. 750E-II_29Rbloke

    750E-II_29Rbloke Active Member

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    It is an XJ Fitz, apparently looks similar to 550 so I'd imagine must be a four ;)
     
  9. xj400gr

    xj400gr New Member

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    thank you all for your help guys! :) i got the engine and i will inform you for the results of the "operation"! :D i give you a photo of how the engine i got is like. if it works with my wiring i will rejet the carbs too. my bike is exactly like this one in the link.
    http://motorbike-search-engine.co.uk/cl ... 0XJ550.jpg
     

    Attached Files:

  10. Orange-n-Black

    Orange-n-Black Well-Known Member

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    Fitz Wrote:
    The 4-cylinder XJ600 motor mounts in a cradle frame, just like the 550s.

    The motor on the 2-cylinder XS400 is PART of the frame; the motor pretty much hangs from the frame and forms part of it.

    It would take MAJOR fabrication to figure out how to even mount it.

    Now if your 400 Seca is a FOUR cylinder, it might just work.



    That was my concern as well, wasn't sure about the frame.
    Keep us informed of how this plays out, best of luck and post pics. :wink:
     
  11. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    He's in Greece. If it's a world-market Seca 400-4cyl then the 600 motor should bolt right in.

    Keep the TCI unit with the motor or find a TCI from a 600, the timing map will likely be different from the 400.
     
  12. 750E-II_29Rbloke

    750E-II_29Rbloke Active Member

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    Yep, the wiring generally shouldn't be a problem but definitely use the 600 TCI with it, as the 400 unit may allow it to run but could cause overheating due to incorrect ignition timing. The 600 TCI *may* plug straight into the 400 loom but do cross-reference the wiring diagrams first to make sure the inputs all go to the same pins.

    As far as the carbs go, I'd personally be happier using the actual 600 carbs if I could get them but it's up to you... Just be aware that it may be more involved than rejetting. Perhaps the place you got the motor from would do a deal to swap/part-exchange carbs?
     
  13. xj400gr

    xj400gr New Member

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    today i took the xj600 engine (vin is 49A) with my xj in my engineer. i will have news in some days!!!
     
  14. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    +1 on Bloke

    You're not likely to re-jet the 400 carbs for use on a 600 -
    it would take a total re-engineering of the "air" jets, diaphragm spring, main needle, ETC. Get some 600 carbs.
     
  15. xj400gr

    xj400gr New Member

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    some news! :D the motor fitted exactly in the frame and we connected the electrical system!! the next days we will finish with carbs and we will start the engine! thank you all for your advice :)
     

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