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Carb swap

Discussion in 'XJ Modifications' started by Joe R, Feb 27, 2021.

  1. Joe R

    Joe R New Member

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    Hello all! I’ve purchased a 1982 750 xj for my sons first machine, and it needs some help. I’m wondering what the implications would be if I take the carbs from a 82 650 xj and install on the 750? Thank you in advance for any help given!
     
    Joe R, Feb 27, 2021
    #1
  2. 50gary

    50gary Active Member

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    Funny, I bought my 82 XJ 750 Maxim without any carbs on it. Went to the local Yamaha dealer (service) and asked them, the mechanic walked me out to their stash of parts bikes and said you can have those (XJ 650) Jet them the same as the 750 and you'll be fine. I ultrasonic cleaned them and jetted them as best I could. Have not yet run the bike with them so I'm not certain they will work?
    Cheers, 50gary
     
    50gary, Feb 27, 2021
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  3. Joe R

    Joe R New Member

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    Thank sir! I’m interested in your findings!
     
    Joe R, Feb 27, 2021
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  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    The 650 and 750 used the same model of carburetor. As mentioned you just have to jet accordingly, including the jet needle and air jets.
    Do you have a service manual?
     
    k-moe, Feb 27, 2021
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  5. Joe R

    Joe R New Member

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    No Sir I do not but I’m sure I can get my hands on one. Truth be told i was trying to save on costs
     
    Joe R, Feb 27, 2021
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  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Here is the jetting info you will need for the swap.
    jet-sizes-from-stock-82-xj750-carbs.25255
     
    k-moe, Feb 27, 2021
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  7. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Joe,

    im near Utica...... I offer rebuild services, if you wish to go that route.
    Send me a private message.
    Dave Fox
     
    hogfiddles, Mar 7, 2021
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