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1980 xj 750 Mikuni carbs

Discussion in 'XJ Technical Chat' started by xjbob, Oct 5, 2011.

  1. xjbob

    xjbob New Member

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    Hi all , i have a 1980 xj750 seca , and the carbs that are with the bike are mikuni bs32ss carbs , i have been doing alot of looking around here and all other xj750's are running hitachi 32 mm carbs , the previous owner of this bike assures me that these are the original carbs ..i am just wondering if some of the very early xj750's were fitted with mikuni carbs ?
     
    xjbob, Oct 5, 2011
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  2. xjbob

    xjbob New Member

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    Hello Out there :roll:
     
    xjbob, Oct 6, 2011
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  3. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    They started making the 750 in 1981, can you post your VIN from the frame neck, and the "shorty" from the engine, above the clutch??
     
    TIMEtoRIDE, Oct 6, 2011
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  4. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    The only 32mm Mikunis that I'm aware of were fitted to the 650 Turbo; the 550s had Mikunis but those were BS28s.

    Let's see that VIN.
     
    bigfitz52, Oct 7, 2011
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  5. xjbob

    xjbob New Member

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    Just got the numbers , Frame number 1U50203748
    engine number 5G2-003669
    The bikes registration details say its first registration is sep 1980 .. i know these short VIN numbers can be a bit vague ..Hope this helps ... :)
     
    xjbob, Oct 7, 2011
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  6. SQLGuy

    SQLGuy Well-Known Member

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    Chacal has some VIN decoding information here: http://www.xjbikes.com/Forums/viewtopic/t=14577.html

    The 5G2 model ID definitely says 750 SECA 1981-1983.

    The serial number, if I'm reading it correctly, seems to say 1982, but I', not sure. Is there another, longer, VIN somewhere on the steering head tube?
     
    SQLGuy, Oct 10, 2011
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  7. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    If those numbers are the "shorty VIN" ("engine" number) and the end of the number off the steering head, they don't match. (..03748 vs. ..03669.) If that's the case, you've got a "transplant" case there, and anything's possible. The '81 750 Seca motor should have Hitachi carbs, so there's been some swappage happened.
     
    bigfitz52, Oct 10, 2011
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  8. xjbob

    xjbob New Member

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    I was thinking there was something not right with the carbs that they should be 32mm hitachi ones , the vin number i gave is what is stamped on the head stock , i did get another bike with this one and the engine number is IV5204427 so maybe that is the correct engine for my bike ,the joys of buying a basket case but it makes it fun and you learn more :)
     
    xjbob, Oct 10, 2011
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  9. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Umm, no that one doesn't match either. If the number on the frame ends in 03748, then the matching engine's number would end in 03748.
     
    bigfitz52, Oct 10, 2011
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  10. xjbob

    xjbob New Member

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    It sure is a basket case of a bike , thanks for the help , its time to go looking for a set of carbs :)
     
    xjbob, Oct 11, 2011
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