Carburetor Rebuild - Is it worth sending out?

Discussion in 'Old's Cool' started by BrokenR80RT, Feb 4, 2011.

  1. BrokenR80RT

    BrokenR80RT But I'll fix it.

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    I guess I am need of advice again. I was removing one of my carburetors and out fell a little broken piece of a metal pin.....:huh. Now I'm thinkin' I had better rebuild the carbs. I'll add a picture, but it's about 1-1.5 mm dia x 1/4" length.

    I am mechanically inclined by trade, but I am wondering for a first time rebuild if I should risk doing it myself or ship them to someone like Bing.

    Did anyone try this for a first time and have a lot of issues or is this a straight forward process?

    Also, any reviews on Bing's updated float and bowl...Is it really a 4-7 mpg improvement + improved torque? Responses will be considered data on this one. :cob

    Thanks a bunch!
    #1
  2. Renner

    Renner rockin' the toaster

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    DIY and save a bundle. It's not a 2,000 piece jigsaw puzzle.
    No need to update the bowls/floats.
    OTOH the Bing catalog is handy but not absolutely necessary.

    If you have access to a small ultrasonic cleaning tank use it, your carbs will sparkle like new.
    In fact use the money saved to buy yourself one if you haven't already.
    #2
  3. The Raven

    The Raven Banned

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    1. Post photo of broken pin thing....you need an ID as hopefully nothing jumped into your engine

    2. Not hard to rebuild, just make sure you do one at a time, do it carefully and systematically. Use Tom's r80g/s rebuild thread as a reference, as well as a couple different exploded views. Rebuild kits have everything you need.
    EUBMW sells a good kit cheap

    3. The independent floats from what I heard are not good. I have not used them




    #3
  4. petefromberkeley

    petefromberkeley -

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    If the independent floats or updated float and bowl are other names for the alcohol resistant set up, I can tell you I hate mine. I don't ride the Beemer much these days but eventually I will put the carbs back to the way they were (assuming they can handle the ethanol we are using now.
    #4
  5. crazydrummerdude

    crazydrummerdude Wacky Bongo Boy

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    If you feel like spending a ton of money for rebuilt carbs, send 'em to me. :deal

    It's super easy. I've done 4 Bings (and about a million onthers) without any manuals or assistance.. and I lived to tell the tale.
    #5
  6. BrokenR80RT

    BrokenR80RT But I'll fix it.

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    [​IMG]

    [​IMG]

    On second glance after the wee hours last night, it is thicker than I remembered + now in daylight, it appears it is not a broken piece, but the ends appear to have but cut during processing. BTW this is from the right cylinder which likes to backfire upon throttle off, but I am very unsure of the history of the carburetor adjustments done by the PO.

    Thanks.
    #6
  7. BrokenR80RT

    BrokenR80RT But I'll fix it.

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    [​IMG][​IMG]
    #7
  8. BrokenR80RT

    BrokenR80RT But I'll fix it.

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    Slide to the right to see the end view.:becca
    #8
  9. jtwind

    jtwind Wisconsin Airhead

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    Bing carb rebuilding especially a basic one is pretty easy and sort of a airhead rite of passage. Lots of good info out there so give it a try. A set of metal hooks and probes are pretty handy to pull the orings in place.
    #9
  10. BrokenR80RT

    BrokenR80RT But I'll fix it.

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    Looking at my Bing diagram, I come up w/ something that's been pretty beat up. Float needle? Needle retainer? Or better yet, wtf!
    #10
  11. Slope'r

    Slope'r Turn'n Valves

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    It's fun, It's satisfying & it's cheap!
    This is a post of my adventures rebuilding Bing carbs. (Click Here)
    #11
  12. dduelin

    dduelin Amazing grace how sweet the sound....

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    Easy job for the DIYer.
    #12
  13. The Raven

    The Raven Banned

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    I'm going with WTF, is the WTF hollow? How was the bike running before you found the WTF?

    The closest thing is a piece of the butterfly shaft. But you would notice that. You didn't drop anything in your airbox did you?
    #13
  14. boxerboy81

    boxerboy81 Stay Horizontal

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    Where exactly did it fall from?
    From within the carb, from the air intake?
    Looks like some sort of locating dowel?
    #14
  15. BrokenR80RT

    BrokenR80RT But I'll fix it.

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    Thanks Raven, et al.

    The bike was running fine pre-accident. It had a backfire in the right bank at shift points, but plenty of power. Idle is still fine after I got rid of all the smoke/oil from laying it down. It still poofs black smoke from the right bank after a rev + throttle off. Engine noise is normal with minimal mechanical rattles. If I had to pick the louder side of the engine I'd say the right where this wtf was found, but it is not radically different from cylinder to cylinder. Bike history is 2 PO's, 46+ original kilomiles. Never tore it apart when I first got it. I had it barely a couple of months before:muutt. Then the rebuild process began (body -n- bike).

    WTF is not hollow. It's just a solid wtf plug. Not having ever touched any of the carb internals, I thought I'd see if someone, anyone could ID this "thing" that was laying between my carb and head intake. It could have been in the intake for years and just got jarred loose when I laid it down on it's right side- gravity.

    Plan of action but not this weekend because of my son's swim meet and the Super Bowl:

    I'm about to replace my rocker covers and reset my lash. I'll go that extra step and remove the head and see if there is any debris in the intake. Inspect valve stems and retainers, shla's (ha, ha), etc. If I cannot see well enough in the intake side of the head, remove the head for a true probe of that cylinder, stare at the piston for a while and check the valve seats and guides for any obvious damage.

    Remove the bowl and float and look for any springs or other crap that could be in there. After all of the encouragement I'll do a carb rebuild and see if I find anything- which means order and wait for parts.

    I'll cetainly report back too. More advice is always appreciated.
    #15
  16. bereahorn

    bereahorn Long timer

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    :ear
    #16
  17. elmontanero

    elmontanero Practicing...

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    2. Not hard to rebuild, just make sure you do one at a time, do it carefully and systematically. Use Tom's r80g/s rebuild thread as a reference, EUBMW sells a good kit cheap

    3. The independent floats from what I heard are not good. I have not used them
    (my bold added)

    I'm digging into mine today. I bought the EUBMW kit, and needle jets and jet needles from the dealer :puke1,

    1)Can anyone spot me the location of "Toms g/s rebuild thread" or his handle on here?
    2) I've got the independant floats on mine, as I've not noticed any trouble, what is typical?
    #17
  18. Renner

    Renner rockin' the toaster

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    per the 'bum http://bmwmotorcycletech.info/bingindependent.htm
    ln a nutshell: lack of overflow exit may result in excess fuel making its way into the cylinder when parked on the sidestand with leaking petcocks... or something like that.
    Mostly they're not worthwhile in terms of value-added, from what I understand.

    I looked at Slope'r's link which looked pretty useful :thumb .
    Similarly I use a half-round file to cut off the peened throttle screw threads (which can be tricky :eek1) only because I don't own a dremel.

    My last rebuild I didn't cut them down far enough and stripped shaft threads while backing out the screw :cry ... I really need to go buy a dremel set.
    #18
  19. Wirespokes

    Wirespokes Beemerholics Anonymous

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    I wouldn't pull the head if the engine is running fine. Perhaps take a peek throught the spark plug hole, or the intake with the carb off.

    That doesn't look like any carb part that I'm aware of, and how it stayed on the intake port without entering the combustion chamber is a real mystery. Is that really true that it was between the carb and cylinder head?

    My only guess is that it was in the airbox and when the bike tipped over, it entered the airtube and made it that far before you discovered it. :eek1

    Man, that could've been messy!

    As has been stated many times, these carbs aren't rocket science, but you'd think so with the prices charged for parts and rebuilds. They're actually very simple, and even with time spent asking us questions, it would be quicker than mailing them off somewhere. Besides, it's good to know your machine so you don't freak out if something happens in the middle of nowhere some day.

    Don't worry about the alcohol issue - the foam floats seem to hold up just fine. It's more some of the local additives that attack fuel systems - some of us don't have any problems, others a lot.
    #19
  20. elmontanero

    elmontanero Practicing...

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    Thanks for that. They were there when I bought the bike so no value to add... I always park on the center stand, so no bother there either. Good read and I'll double check the float settings as I do the rebuild.
    #20