Results 1 to 6 of 6

Thread: floats

  1. #1
    jimmy armour
    Join Date
    Jul 2009
    Lucknow ontario canada


    Hi Me again, while doing some maintence I noted the floats on my alcohol proof bing carb kit ,dont float as they used to so, I still have the original floats how do these stand up with todays fuel? once again thanks in advance Jimmy

  2. #2
    Registered User m_stock10506's Avatar
    Join Date
    Feb 2005
    Trinity, NC
    I had problems with the floats on both of my Airheads, as well as other carb parts. I now run the bikes with only non-ethanol gas and have had no problems since. If it’s available to you, that’s what I would recommend
    Michael Stock, Trinity, NC
    R1100RT, R100, R60/6

  3. #3
    Registered User STEVENRANKIN's Avatar
    Join Date
    Dec 2006
    Spencerport, NY

    My suggestion

    I would look for a replacement set of alcohol resistant floats to replace the bad ones. I would not go back to the original floats.

    I am not an expert on floats, early BMW floats were not alcohol resistant, later year floats may have been or were.

    I also run non-ethanol gas WHEN I can find it. I also run the highest octane 10% gas.

    The bikes had been converted over to alcohol resistant floats and rebuilt with alcohol resistant parts and fuel lines.

    Both my airheads run fine on either gas. I will not run any mix higher than 10%, however. St.

  4. #4
    jimmy armour
    Join Date
    Jul 2009
    Lucknow ontario canada

    carb floats

    Hello again, i was wondering how long the std floats would last ? Jimmy

  5. #5
    B Reams brook.reams's Avatar
    Join Date
    Jan 2007
    Arvada, Colorado
    Quote Originally Posted by jimwjarmour View Post
    Hello again, i was wondering how long the std floats would last ? Jimmy
    Hi Jimmy,

    I use the standard floats. To test if they are "fuel logged", weight them on a kitchen scale that can measure in grams. New floats are on the order of 10-13 grams. Fuel logged floats are on the order of 18+ grams.

    I have standard floats that have been used for more than 5 years with Ethanol (10%) laced gasoline. They are not fuel logged. That said, the rubber seals in the carbs don't seem to hold up as long as I would like.

    My general rule of thumb is to consider replacing the carburetor o-rings and floats in the 5-7 year bracket to avoid unpleasant experiences. It's easy to check the o-ring condition by unscrewing the jet carrier with the large o-ring and the idle jet screw with the small o-ring. It they tear when you remove them, seem swollen, or are cracked, time to replace them, the diaphragm, and the floats while you are at it, aka, a full carburetor rebuild. That will cost you about $250-$300 at today's parts prices and using your own labor.

    Here is how you do a complete rebuild.

    At about 35,000-45,000 miles, it's worth replacing the jet needle and needle jets as well. These wear from vibration and lose the ability to accurately meter the mid-range fuel flow.

    I hope that helps.

    Brook Reams.
    Brook Reams - Arvada, CO
    Endeavor to Persevere
    Various Two-wheeled Vices, All BMW || Website: Airhead Rebuild Projects
    2004 R1150-RS||2002 F650-GS||1983 R100RS||1977 R100RS||1973 R75/5

  6. #6
    jimmy armour
    Join Date
    Jul 2009
    Lucknow ontario canada

    thanks for the help

    thanks again yes I noted Motobins only has the standard items for sale, I installed 2 bing kits way back at an national rally Madison Indiana I seem to remember so they are a lot of years old, so being the packrat that I am I still have the old std ones from both mine and my friends bike ,so if they only last a year or two that will do, re the diaphrams O rings and needles all changed last year, so, at present I,m installing an RT fairing ,and once finished will try the old floats, thanks all, bye for now Jimmy

Similar Threads

  1. Replacing floats.
    By georgej in forum Airheads
    Replies: 5
    Last Post: 09-15-2011, 01:07 PM
  2. Bing CV carb floats
    By jcofwmburg in forum Airheads
    Replies: 7
    Last Post: 06-24-2009, 01:02 PM
  3. are 25 year old floats most likely bad?
    By BUBBAZANETTI in forum Airheads
    Replies: 8
    Last Post: 06-17-2009, 01:14 AM
  4. sticky floats in /2
    By chwood4 in forum Vintage
    Replies: 3
    Last Post: 01-22-2007, 12:41 AM
  5. Floats are in
    By hlothery in forum Oilheads
    Replies: 1
    Last Post: 07-25-2006, 10:25 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts