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xj750 motor to a xj550 frame?

Discussion in 'XJ Modifications' started by altvater88, Jan 30, 2011.

  1. altvater88

    altvater88 New Member

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    i have a 81' xj750 seca with a low miles motor and i can get my hands on a 81' xj550 hard tailed bobber with decent miles but i was wondering if i could swap the the 550 motor out with the 750? i trust the 750 motor more since i have maintained it, where as i can never know how well the 550 was taken care of ( also the 750 is obviously way bigger )

    i only want to do the swap because the xj550 is already been had the bobber modifications and i wanted to do that with my 750 but havent had the time nor the place/equipment to do it.
     
    altvater88, Jan 30, 2011
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  2. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    You do know the 750 is shaft drive; not chain like the 550 ??
    The motor mounts won't line up, the 750 motor is physically a bit bigger.

    So, imagine cutting both frames carefully, and grafting the 550 top section on to the 750 bottom section. Big project.
     
    TIMEtoRIDE, Jan 30, 2011
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  3. PainterD

    PainterD Active Member

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    Anything's possible with a torch, grinder and welder when it comes to modifying the frame, which is what you'll need to do to get the 750 engine in that frame. Once you get the shaft drive assy and rear wheel for it, all that needed is to line things up and make new motor mounts in the frame. The electrical is another story and you may get by with just a simple bobber wiring harness to make things work.
    I have a 750 Maxim frame and rear wheel assy. you can have for free if you want to come to Minnesota and pick it up!
     
    PainterD, Jan 30, 2011
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  4. cutlass79500

    cutlass79500 Well-Known Member

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    I dont think you want to tackle this project. You will have to do major frame mods the swing arm is wider on the 750 and longer i think. Your better off getting a 750 frame it would just be way to much work and unless your an expert welder and fabricator your swiss cheese frame will be dangerous
     
    cutlass79500, Jan 30, 2011
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  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Width alone's got very little to do with it.

    IT WON'T FIT.

    I've got 550s and a 650. The shaft-drive bike is about a foot and a half longer than the 550s because of the middle gear case; and the swingarm mounts for the shaftie are completely different.

    You would pretty much have to build a new frame.
     
    bigfitz52, Jan 30, 2011
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  6. altvater88

    altvater88 New Member

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    ok guys, thanks. i have a full 750...just havnt done anything... was looking for an easy way out and yes i know the 750 is shaft versus the 550 being chain... so the next part of the question... the 81' xj550 bobber with roughly 10k listed on odomter for my 81' cb650 with the same milage in the same condition... worth it right?
     
    altvater88, Jan 30, 2011
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  7. altvater88

    altvater88 New Member

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    altvater88, Jan 30, 2011
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  8. 16ozbud

    16ozbud Member

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    Seems easier to make the 750 frame a rigid than to fit the 750 motor into the 550 frame. A LOT EASIER!
     
    16ozbud, Jan 30, 2011
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