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I need to replace a float valve needle. I'm surprised to find the original one has a black spring pin. I believe there are 3 spring stiffnesses denoted by the pin colour, silver, gold and black in increasing order and that one would normally use silver. This black one is very stiff, I can't imagine the floats being able to compress it at all. I have an old one around with a silver pin and it's much softer.

Can anyone (Roger maybe ?) confirm if silver is right, does it matter much and could there be any good reason to use a black one?

Rotax UK distributor price £60, BMW vintage bike specialist £18 ?

  • Re: Float valve needle

    by » one year ago


    I believe it is silver colored metal shaft (chrome colored). I've  never seen a black one. The old needle valves from two decades ago had a red rubber tip which was supposed to be changed for the black tip upgrade a couple decades ago.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


    Thank you said by: Mike Wylde

  • Re: Float valve needle

    by » one year ago


    Just found SI-912-012 R1 from 2004.

    Prior to this, 912 and 914 used the one with a nickel plated pin which has a soft spring, 912S used the one with a black pin, denoting a stiff spring - which it certainly is.

    After this SI all models should use one with a gold coloured pin which has .... a medium strength spring (ah you guessed!) part no 261706.

    The ULS changed at no 4429091, mine is 4428986 so was one of the last with black pins.

    So if you're seeing lots of nickel plated ones, Roger, either it's changed again but I haven't found it, or this SI is being disregarded.

    Hard to believe it will be very critical.


  • Re: Float valve needle

    by » one year ago


    The ones I'm  getting in the Bing carb overhaul kits are the nickel  plated stem ones.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


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