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84 XJ600 engine into an 81 XJ550 frame?

Discussion in 'XJ Technical Chat' started by BonezOz, Sep 11, 2011.

  1. BonezOz

    BonezOz New Member

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    BonezOz, Sep 11, 2011
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  2. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    A resounding "yes". You'll need to use the 600 carbs and ignition box.

    check it out

    He ends up building a 600 motor /\
     
    TIMEtoRIDE, Sep 11, 2011
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  3. BonezOz

    BonezOz New Member

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    I thought as much and after I got it home yesterday I definately felt that it would, but I had a MC mechanic tell me last week that there was no possible way.

    Cheers
     
    BonezOz, Sep 11, 2011
    #3
  4. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Horse feathers. Oh, sorry--- EQUINE PLUMAGE!

    The 550 and the early 600s were virtually IDENTICAL; we've got members on the site with XJ/FJ600 motors in Seca 550 frames.

    Just be sure it's an early 600; not the later (Diversion/Seca II) motor; the cylinders are tipped forward on those later generation motors and they WON'T fit. If it's got the exact-same shaped clutch housing and primary sprocket covers, it's the right lineage 600 and it will drop right in. Be sure to use the TCI unit from the 600.

    If I ever blow up my '83 550 Seca I'll be looking to replace it with a 600cc mill.
     
    bigfitz52, Sep 11, 2011
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  5. Ledicott96

    Ledicott96 Member

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    Ledicott96, Sep 12, 2011
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  6. Kickaha

    Kickaha Active Member Premium Member

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    Kickaha, Sep 12, 2011
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  7. Ledicott96

    Ledicott96 Member

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    Right thanks for that.
    Al
     
    Ledicott96, Sep 12, 2011
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  8. inet101

    inet101 Member

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    http://www.ebay.co.uk/itm/Modified-1981 ... 336ba78c3b

    Wow....would luv to throw a leg over this one! Not too far off the direction my 550 is headed cept his has much more shine.........

    As for the 600/550 swap....its a straight away bolt in cept for the black box as noted . I have a 82 Seca (US spec 550) and both a extra 81 550 & a 86 Radian 600 lump. Had em both installed for fitting up, no probs what so ever.
     
    inet101, Sep 12, 2011
    #8
  9. BonezOz

    BonezOz New Member

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    Uh Oh, shaggy, I think I remember seeing a burned out section of that particular box.... :(
     
    BonezOz, Sep 13, 2011
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  10. dinoracer

    dinoracer Member

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    You don't need a different black box, you can use the seca 550 black box.
    They have the same connectors as the seca's so why wouldnt they work? Besides I have a FZ 600 motor in my seca 550 using stock ignition.

    Sean
     
    dinoracer, Sep 13, 2011
    #10
  11. a100man

    a100man Well-Known Member

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    Old thread I know - but has anyone figured out a solution for connecting 52mm (XJ600) carb mouths back to the stock 550 (Seca) airbox ?

    Cheers
     
    a100man, Aug 12, 2014
    #11
  12. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Couldn't you use the boots from the 600 and "adjust" the holes in the airbox accordingly?

    How different are the airboxes themselves? With the motor out, the airbox just slots in; will the 600's box fit in the frame the same? I can't check the fiche, we didn't get the actual XJ600 here.

    Interesting side note, something I noticed in the FJ600 fiche: Instead of capping off the vac ports on the intake manifolds, #2 and #3 are connected via a vac line; and #1 and #4 are "teed" together, the tail of the "T" runs to the petcock.
     
    bigfitz52, Aug 17, 2014
    #12
  13. a100man

    a100man Well-Known Member

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    Hi BF

    Indeed that was likely to be my first move - just wondered if anyone had been there before me.

    Presumabely the intake links are some kind of 'balancer'...

    Cheers

    JS
     
    a100man, Aug 17, 2014
    #13

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