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Quick question on vacuum syncing

Discussion in 'XJ Technical Chat' started by PilotSmack, Apr 18, 2014.

  1. PilotSmack

    PilotSmack Active Member

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    Hey guys,

    Question regarding 4 bottle syncing. Get the bike to operating temperature, block YICS, hook up the bottles to the 4 vac nipples, test 3 to 4, 1 to 2, and 2 to 3. My question is: Since all the vac tubes will be hooked up, do I run with the petcock on PRI? Or is it generally easier to run a 2 bottle setup?
     
    PilotSmack, Apr 18, 2014
    #1
  2. lacucaracha

    lacucaracha Member

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    Absolutely, or run it from an external bottle .
     
    lacucaracha, Apr 18, 2014
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  3. lacucaracha

    lacucaracha Member

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    What do you mean two bottle? You should just need one for gas, and you can throw in a little valve in line to make it easier.
     
    lacucaracha, Apr 18, 2014
    #3
  4. PilotSmack

    PilotSmack Active Member

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    Oh I mean 2 bottles as in syncing 2 carbs at a time instead of 4. And thanks for the input!
     
    PilotSmack, Apr 18, 2014
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  5. hogfiddles

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

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    I use a lawn mower tank mounted on a stand, the tank is higher than the carbs so it is a gravity-feed. I remove the bike's tank completely so that it's not in the way at all, can't get bumped, dented,................blown up, etc.......

    The mower tank has an on/off valve on it, and about 5 ft of tubing, so it can also be well out of the way.

    Dave
     
    hogfiddles, Apr 18, 2014
    #5
  6. k-moe

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

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    You'll want to run the engine with the petcock on prime. Using 2 bottles and swaping them over is cheaper, and less brain-strain inducing for me. Why all the asnwers about aux. fuel tanks?
     
    k-moe, Apr 18, 2014
    #6
  7. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    On some XJs it's easier to get the fuel tank completely out of the way for the procedure.
     
    bigfitz52, Apr 19, 2014
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