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Synch Proceedure

Discussion in 'XJ Technical Chat' started by Beer, Sep 8, 2019.

  1. Beer

    Beer New Member

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    Been searching for a bit, but I’m not coming up with anything useful. Borrowed a Carb Tune from a guy at work so I can synch the carbs. Does anybody have a link for the proceedure?


    ‘81 XJ650 Maxim
     
    Beer, Sep 8, 2019
    #1
  2. StahlMaster

    StahlMaster Active Member

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    First off you will want a fan to cool the engine while you tune. It will take longer then you think. Does your engine have the YICS ports? If so, you will need a "blanking tool".
    I'm sure others will chime in with to proper order for the tune.
     
    StahlMaster, Sep 8, 2019
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  3. k-moe

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

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    The YICS blanking tool is unnecessary.
    A fan is optional.

    Synch is easy.
    Hook up your gauges to each vacuum port.

    Match cylinder 1 to cylinder 2

    Match cylinder 4 to cylinder 3

    Using the synch screw between 3 and 2, match the 1/2 pair to the 3/4 pair.

    You will likely need to adjust the idle speed as you work, and then again after the synch is complete.


    Video here (good for all models of XJ): XJ550 SECA Carburetor Balancing

    It can be done if you only have one vacuum gauge, but it takes longer.
    Old School Method of One Vacuum Gauge Carb Sync
     
    k-moe, Sep 8, 2019
    #3
    Stumplifter likes this.
  4. XJ550H

    XJ550H Well-Known Member Premium Member

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    sync.PNG sync1.PNG
     
    XJ550H, Sep 8, 2019
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  5. Beer

    Beer New Member

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    I was just hoping for a link. You guys are great!

    This site has been an invaluable resource for the couple of months I have had the bike.

    I’ll have to take some pictures to post to the Previous Owners Masterpiece thread, though I have fixed a bunch of stuff already.
     
    Beer, Sep 8, 2019
    #5
    Maaddecent16, Rusty81, Stumplifter and 1 other person like this.

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