Throttle Body Sync

Discussion in 'The Garage' started by afmeyer, Sep 14, 2012.

  1. afmeyer

    afmeyer Adventurer

    Joined:
    Apr 15, 2003
    Oddometer:
    73
    Location:
    NC
    Most of the threads are years old. What is recommended now for throttle body sync? The twinmax is available but the Harmonizer doesn't seem to be available. There is also the Carbtune and the home made manometer.I'm looking for suggestions. Is there anything new or is one of the devices I mentioned very good?
    #1
  2. gn77b

    gn77b Been here awhile

    Joined:
    May 15, 2010
    Oddometer:
    147
    Location:
    RO
    FWIW, I'm using the DIY version (clear tube filled with oil) with good results.
    #2
  3. VStromTom

    VStromTom Long timer

    Joined:
    Aug 26, 2004
    Oddometer:
    1,579
    Initially I used the homemade manometer but didn't like it because of rapid changes to the columns of liquid with the slightest change in balance. Flow restrictors may have reduced that problem but I didn't like it, and the damn thing was cumbersome to use and store. I now use a TwinMax with great results. Some hamfisted guys gripe about sensitivity and having to change the 9v battery each year but I have no problem with that. I recall seeing something about the harmonizer, which seemed good, but don't know anything else about it. Good luck. Carb stix are an old tried and true tool/method, but I haven't used it.
    #3
  4. Andrew

    Andrew Optimus Primer Super Moderator

    Joined:
    Sep 25, 2001
    Oddometer:
    16,096
    Location:
    Eastbania
    I used to use a TwinMax, but threw it away in favor of a manometer tube setup, which was much more reliable and accurate. But I now use Grok's Harmonizer, which I feel is superior in every way for balancing throttle bodies.
    #4
  5. trc.rhubarb

    trc.rhubarb ZoomSplat!

    Joined:
    Nov 15, 2011
    Oddometer:
    2,097
    Location:
    Concord, CA
    I have the carbtune... I like it because it's very dampened. It's also a little bigger and easy to see while bent over and adusting the cables while holding the throttle and watching the tach all at the same time... reminds me of playing twister :D
    #5
  6. LexLeroy

    LexLeroy Chief Mansplainer

    Joined:
    Jan 2, 2011
    Oddometer:
    2,809
    Location:
    Lexington, KY
    +1 on the DIY manometer - mine's filled w/ blue 2-stroke oil and I use it every oil change.
    #6
  7. bob393

    bob393 Been here awhile

    Joined:
    Dec 23, 2010
    Oddometer:
    394
    Location:
    Goshen, NY
    +2 use red trans fluid in mine. I found kinking the tube at the bend dampens it just fine for my use.
    #7
  8. duck

    duck Banned

    Joined:
    Mar 19, 2004
    Oddometer:
    10,403
    Location:
    Seattle (Berkeley with rain)
    For two cylinders a TwinMax works fine.

    I use a Carbtune now because it does all three or four cylinders at once.
    #8
  9. fast4d

    fast4d Long timer

    Joined:
    Jul 27, 2007
    Oddometer:
    2,538
    Location:
    Los Angeles, CA
    some bikes (rotax/aprilia v-twin for ex) have a map sensor on each TB so you can get it in the ballpark......no tubing necessary!
    #9
  10. bwringer

    bwringer Gimpy, Yet Alacritous

    Joined:
    Jan 22, 2008
    Oddometer:
    2,281
    Location:
    Indianapolis
    The Carbtune is fantastic. And you can sync 2, 3, and 4 cylinder bikes. :deal

    Your friends will gather around to watch you tear down and tune up all kinds of motorcycles...

    What sort of conveyance are you synchronizing, anyway?
    #10