bing slide springs, tell me what you know

Discussion in 'Airheads' started by mfp4073, Oct 27, 2012.

  1. mfp4073

    mfp4073 Long timer

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    Jul 5, 2010
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    My understanding is that these are added to the slide as an "fix" for sticking older slides and are a normal bmw part, etc. I got a pair from hucky ($1.70 each or something) and installed them because I sometimes am not having my idle return to base when I stop. Now once installed it seems to rob some of the "top end" power, and that highway speed "roll the throttle to pass" power is gone. I dont see how the slides can even move with them in place. Going to take them out, but figured I would post up to see what everyone else has experienced and/or educate others that might be conidering it as a fix.

    Just as an additional, I replaced my slide needles at the same time.
    #1
  2. mfp4073

    mfp4073 Long timer

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    Pulled them back out, now its back to normal. Power in the high end and "roll the throttle power" restored.
    #2
  3. disston

    disston ShadeTreeExpert

    Joined:
    Mar 22, 2011
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    They are a part for later model BMWs. Don't know what years or models had them but it was an addition by BMW or by Bing for BMW. Supposedly it was to help a return to idle after higher revs. I did not notice a loss of higher speed power or anything like you mention when I put them on. I've had them in my carbs for over a year. The idle still hangs sometimes but I think it is better, working from memory on this.

    There are two versions of the carb slide springs. An earlier one is a heavier spring and the lighter later spring is the one recommended. If you, or anybody else needs the part # I'll look it up, just ask.

    My bike is also an R90/6 but 1975.

    If you needed the jet needles in your carbs you most likely also need the needle jets. If the needles are worn the jets are too. They work together.
    #3