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xj 750 carb for 550 ?

Discussion in 'XJ Technical Chat' started by emre_xj_750, Mar 28, 2014.

  1. emre_xj_750

    emre_xj_750 New Member

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    I have bought a 550 but the previous owner took carbs a part and placed everything in a trash bag which got a hole on it and he moved a few times so I have carb body and a few carb parts...I have a running 750 and thinking to borrow carbs from 750 to see if 550 will run. if runs I will be looking to buy 550 carburator


    what are your thoughts on this project?
     

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    emre_xj_750, Mar 28, 2014
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  2. biggs500

    biggs500 Active Member

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    It won't run worth a darn with the 750 carbs. Partly because the jetting and more so because they wont fit. That last one will keep it from running at all.
     
    biggs500, Mar 28, 2014
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  3. ecologito

    ecologito Well-Known Member

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    The 750 came with hitachi carbs and the 550 had mikunis (at least the 550 seca), total different specs.
     
    ecologito, Mar 28, 2014
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  4. biggs500

    biggs500 Active Member

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    And the 550 carbs are 28mm vs 32mm for the 650/750. The center lines are different too.
     
    biggs500, Mar 28, 2014
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  5. emre_xj_750

    emre_xj_750 New Member

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    looks like it is not gonna work,
    thanks guys
     
    emre_xj_750, Mar 28, 2014
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  6. Bigshankhank

    Bigshankhank Active Member

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    Well if the engine turns over, and you have compression and spark, then yes the bike will run. No need to bugger around with the wrong carbs.
     
    Bigshankhank, Mar 28, 2014
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  7. emre_xj_750

    emre_xj_750 New Member

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    spark and compression is there an have 5000 miles on the clock...just had a bad owner...i will hunt down a carburetor
     
    emre_xj_750, Mar 28, 2014
    #7
  8. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    You're going to need a whole rack; jump on eBay.

    Things to keep in mind: the 550 Seca and Maxim used the same carbs, but there were slight internal differences (pilot air jet and slide needles.) If you want to make life easier on yourself, find a rack from a Maxim.

    Also, a key component of the throttle mechanism is a 3" long "stub cable" that connects the throttle quadrant on the rack to the actual throttle cable. Without the stub cable, you'll drive yourself crazy trying to figure out how to hook up the throttle cable.

    See if you still have one; or make sure the rack you buy has one with it.

    You can see it in this pic, hanging away from the throttle quadrant:

    [​IMG]
     
    bigfitz52, Mar 29, 2014
    #8

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