Bing carburetors

Discussion in 'Airheads' started by boyblu, Nov 26, 2013.

  1. boyblu

    boyblu Adventurer

    Joined:
    Nov 20, 2013
    Oddometer:
    54
    I think there's a Bing carburetor secret: a tiny chamber beneath the idle jets because of the way it's made. The chamber fills over time with old lead and other sediment and needs, somehow, to be cleaned. A pressed-in plug closes the chamber. If it were possible to extract this plug (and later put it back) the chamber could be cleaned--has anyone ever done it?
    #1
  2. ozmoses

    ozmoses Ride On

    Joined:
    Jul 3, 2009
    Oddometer:
    8,149
    Location:
    USA
    fake n00b?
    #2
  3. disston

    disston ShadeTreeExpert

    Joined:
    Mar 22, 2011
    Oddometer:
    12,291
    Location:
    Silver Spring, Md
    Are you referring to a plug in front of the idle jet, outside of the bowl gasket area, next to the idle mix screw?

    Such plugs are removable sometimes. Or maybe I should say, "I can remove it, not sure how much damage I would cause." The procedure is to drill a small hole and pull plug with a small slide hammer and threaded screw tip, like doing body work. A smaller than body work hammer would be needed. I have such a tool but I think it is made for even bigger plugs than this. Needs a really small puller.

    Pretty sure removing the plug will destroy it. You'll have to make another one. Heat of course would help, it looks like a steel plug in the Aluminum body.

    Have you actually pulled one of these plugs and found the area clogged? Or this is just "supposing"?

    We have had reports of carbs that responded well to cleaning the idle passage in the carb body with thin wire. This may be doing the same thing you are contemplating.
    #3
  4. Beezer Josh

    Beezer Josh Moto-Amish

    Joined:
    Jan 19, 2013
    Oddometer:
    1,525
    Location:
    15.6 miles from the U.S. Capitol
    Bings or Amals?
    #4
  5. Beemerboff

    Beemerboff Long timer

    Joined:
    May 23, 2005
    Oddometer:
    2,654
    Location:
    Adelaide, South Australia
    I have found that a spray can of carb cleaner does the job.

    You just have to get a good diagram of a Bing carb, then spray the cleaner into every orifice and make certain it comes out or the right places.

    Remember there are two pin pricks, and the other one gets blocked more often than the idle jet - it is cleaned by blowing down the small hole which runs parallel to the inlet throat.

    Regular doses of Seafoam, or injection cleaner, are probably a good idea too - gas aint what it was a few years back and doesn't take long to break down.
    #5
  6. mesher

    mesher Adventurer

    Joined:
    Sep 20, 2013
    Oddometer:
    82
    Location:
    Garden Route, South Africa
    Maybe this is where the old spline lube ends up? :D
    #6
  7. Rob Farmer

    Rob Farmer Long timer

    Joined:
    Aug 27, 2002
    Oddometer:
    6,725
    Location:
    Loughborough, Leicestershire. England
    Ultrasonic clean once a year here.
    #7
  8. 190e

    190e Long timer

    Joined:
    Feb 20, 2013
    Oddometer:
    1,252
    Are we talking about the location indicated by #5

    Removing the pilot mixture screw and squirting carb cleaner down the pilot air inlet would clean that.

    [​IMG]
    #8