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Running sync: screw in or out, that is the question

Discussion in 'XJ Technical Chat' started by quebecois59, Nov 10, 2015.

  1. XJ550H

    XJ550H Well-Known Member Premium Member

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    electronic sync tool do you have a link to where they are available?
    found them
    mfg site
    http://tecmate.com/products/carbmate/

    i see it aslo has a 2 to 4 carb adapter.
    do you just use the 2 carb set up?
     
    Last edited: Nov 12, 2015
  2. cds1984

    cds1984 Active Member

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    Thats the one I bought! But I bought it locally from a bike shop, so no on the link.
    I only do the 2 carbs at time and it works a charm.
    As long as you adjust the idle as you go if it goes above or below the 1050RPM it works really well.
    A hell of a lot simpler than watching levels go up and down on a manometer, thats for sure.
     
  3. quebecois59

    quebecois59 Well-Known Member

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    How much did you pay for that cute gizmo?
     
  4. cds1984

    cds1984 Active Member

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    I bought it in December of 2010 for $166.10 AUD. Wow time flies!
    Been using it ever since and swear by it though.
     
  5. quebecois59

    quebecois59 Well-Known Member

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    Fiouu, not cheap, but if you enjoy it a lot, that's okay !
     
  6. cds1984

    cds1984 Active Member

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    I made the 2 bottle sync tool first... it drove me nuts watching those levels moving the wrong way and then too far and then... ack!
    I ended up with the carbmate after researching manometers and the like. I have a friend who bought a set of manometers for all 4... he comes to my place and we use the carbmate LOL.
     
  7. quebecois59

    quebecois59 Well-Known Member

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    Well , you would have had fun with my setup ! I was a bit anxious before I used it for the first time, but it went very very smooth, no hurry! And it is very forgiving if you turn the screw the wrong way, because the tubes are 7 foot long.

    I know it would have been a different story without a good bench sync at first, though.
     
  8. rocs82650

    rocs82650 Well-Known Member

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  9. Polock

    Polock Well-Known Member

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    so with the carbmate the levels always go the right way and never too far......amazing!
     
    quebecois59 likes this.
  10. quebecois59

    quebecois59 Well-Known Member

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    I was said several times that if i'd turn the mixture screws a bit in or out to adjust the idle mixture after a running sync, it will affect the balance and I'd have to sync again.

    Can someone explain that? I mean, is that possible that a little change in the opening of a so very tiny passage would change to total vacumm of a carb enough to be noticeable on the sync tool or guage?

    ALso, I don't have a colortune, is pulling the spark plug and reading the electrode color the only way to tell the mixture is right or off?
     
  11. hogfiddles

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

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    And for half that amount, I got my carbtune Pro, can do all four cyls at the same time, use no fluids that could possibly contaminate anything, and balance the rack in only a few minutes.... I'll stick with my Morgan Carbtune
     
  12. hogfiddles

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

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    Québécois, if you change the mixture it COULD affect the balance. That doesn't mean it WILL.

    I just recommend that if the rack was just redone, that the carb balancing is done, do a colortune, then carbtune again just in case anything did change substantially. Heck, why not colortune again, too. Do it as a " for fun" thing, not a "chore" thing.

    After its dialed in, if you check it again next year at a carb clinic, do it once and youre done. It is just maintenance at that point.

    If you don't have a colortune; use the plug color, or take temp readings of the exhaust pipes, or if you're really one with your bike you can go by sound/feel. Last, there are some smartphone programs that SUPPOSEDLY can listen and help you dial it in...I'm not convinced of that yet----

    Dave
     
  13. quebecois59

    quebecois59 Well-Known Member

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    Dave, I clearly understand the difference between WILL and COULD, thanks for the explanation.

    I used to adjust mixture by ear on my XS650 twin, i'm not so confident with the big four-in-line. But I may give it a try anyhow.

    The engine idles pretty good and stable when warm, but not so good when cold, maybe it is not a question of mixture, maybe the enrichment circuit is not as clean as could be.
     
  14. XJ550H

    XJ550H Well-Known Member Premium Member

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  15. aliyanage

    aliyanage New Member

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    Hi all,

    I was able to sync all four carbs but I have a super hard time to get the idle range set. It seems to break down and then the engine stops. when turning the idle higher the engine screams like crazy and I just cant seem to find tve right position to keep it steady. any tips?
     
  16. hogfiddles

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

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    What have you done previously to the carburetors?
     
  17. aliyanage

    aliyanage New Member

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    I took the whole thing out since it was very dirty and cleaned all parts and put it back together. did a bench sync too as described in one of the forum topics
     
  18. hogfiddles

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

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    So you just took it all apart, but didn’t replace anything? You can pretty well bet you have air leaks all over then.

    How did you clean everything? What did you use?
     
  19. aliyanage

    aliyanage New Member

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    Sorry of course I didnt just clean it I replaced all parts, bought a new kit for it. First I used a carburetor cleaning spray and then put everything into the ultrasonic cleaner.
     
  20. aliyanage

    aliyanage New Member

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