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Thread: Bing CV carb position/level

  1. #1
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    Bing CV carb position/level

    Ok airhead gurus,

    Just finished spline lube on tranny and putting the r100s back together- how I love repair manuals that say
    "Make sure to position carb properly" without giving diagrams or explaining! So far searches on topic have been unfruitful- How are you supposed to position carbs angle/rotation wise? Pivot in/out or level and what do you use as point of reference? Thank you!

  2. #2
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    Question

    This is a good question! For my '77 R100S I used a pocket level across the tops and simply set both level. There is a certain amount of inclination that's already built in so not much variation allowed there.

    Seems like you would not want too much tilt as it would affect the float level?

    Inquiring minds want to know!

  3. #3
    Monza Blue 1974 R90/6
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    This is a topic for debate.

    There have been a couple of folks who recommend tilting the carbs slightly inward to reduce the bend at the end of the throttle cable. I think the angle of 10 degrees has been thrown about.

    Others swear by level.



    Barron

  4. #4
    Registered User donbmw's Avatar
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    I just eye ball mine. Never felt I had by issue doing it this way.

    Don
    1975 R90/6, 1980 and 1982 R65, !959 TR3A Triumph Car

  5. #5
    James.A
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    Quote Originally Posted by donbmw View Post
    I just eye ball mine. Never felt I had by issue doing it this way.

    Don
    I agree.

  6. #6
    moosehead
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    Yep. I eyeball mine as well for perpendicular orientation.

    Stand behind bike and "eyeball" that both carbs are perpendicular...straight up and down.

  7. #7
    Registered User toooldtocare's Avatar
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    There was quite a discussion on this awhile back. If my memory serves me right there was no correct answer, but photos I have from old ad slicks from the 80s show them tilted in a bit. One person also said that they seem to fit the tubes better when they are rotated in a little, like the tubes were made for this. I loosened the carbs on my Motorsport and tried it and they did seem to "snap" into place when slightly tilted in. Anyway, mine have always been rotated in about 10 to 15 degrees.

    Wayne

  8. #8
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    Snowbum sez.............

    "The carburetors should be mounted squarely to the motorcycle. View from the top, and a few feet to the rear of the bike. Do NOT tilt the tops towards, or away, from the motorcycle."

    This is from his site at: http://bmwmotorcycletech.info/techni...icles-list.htm

    Item #3 3. Carburetors PART 1, overhaul; GENERAL NOTES, HINTS, floats testing leaking
    tops & dome inserts, tricky enrichener discs/shafts assemblies, Bing
    Independent Float Kits (see 5 below for all those details), ETC. rev. 11/06/2012

    or go directly to the page @: http://bmwmotorcycletech.info/bingcv.htm

    To find this statement, go almost all the way down the thread to just above the paragraph titled "Carb Top Stains" to 2 paragraphs above.

    Don't know if this is the definitive answer, but FWIW he's an Airhead guru.

    Bill Edwards
    Boerne, TX

  9. #9
    Registered User toooldtocare's Avatar
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    Thanks, I trust snowbum.

  10. #10
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    Excellent, thank you all for your replies!

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