Spring in Float Needle
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Thread: Spring in Float Needle

  1. #1
    Junior Member when_we_low's Avatar
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    Spring in Float Needle

    I'm currently rebuilding my carburetors on a 1972 CB350 and I've encountered an issue while attempting to set the float height. The spring device in the float needle works just fine, however, every time I attempt to set the float height, the float presses on the needle and compresses the device. First, I assume that the float height should be set with the float just resting on top of the needle, not pressing down on it? Second, is it normal for the float to always press down on the needle? The only way in which it does not is if I very, very gently lift the float up and lightly set it on top, although, even this is difficult without pressing on the spring device in the needle even just a bit.

  2. #2
    Sensei 66Sprint's Avatar
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    Hold carb with slide path horizontal, float hanging perpendicularly........
    Slowly rotate bowl end upwards until float tang just touches the spring needle....
    Measure and Set float height while carb held at that angle......
    Crashoverride likes this.
    "I have a mind like a steel trap.....Old and rusty, of antiquated design, and hard to get stuff back out of...."
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  3. #3
    Junior Member when_we_low's Avatar
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    Unfortunately, even when trying to set the float height that way, the float still compresses the spring needle down. It's almost as if it's too heavy—perhaps my float is compromised? I didn't see any pinholes under inspection but those can be hard to catch. Or, alternatively, the spring in the float needle could be bad?

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    Sensei 66Sprint's Avatar
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    Spring in Float Needle-004.jpg
    "Tang" JUST touching, NO pin compression..... If you can't do that the float or tang are too bent
    Last edited by 66Sprint; 05-07-2019 at 07:58 AM.
    "I have a mind like a steel trap.....Old and rusty, of antiquated design, and hard to get stuff back out of...."
    Contact info: E-mail; [email protected] Phone; 540-525-5199

  6. #5
    Senior Member ancientdad's Avatar
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    or the float has fuel in it, adding to its weight
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    Tom

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    running points... because I'm too old for mysteries that begin with pushing

  7. #6
    Supporting Member Yendor's Avatar
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    Or the Spring in the Float Needle is bad.
    1970 CB 350 CAFE - Current Project on the bench,
    1972 CB 350 K4 Red - Now a Happy Rider ! !
    1972 CB 350 K4 Green (My Sons) DONE - YES !,
    1st Bike 1970 SL 350 (Brought home in Parts - Trailer/Trunk/Back Seat - I miss that bike),
    2nd - Bike Kawasaki 750
    3rd - '73 XLCH 1000

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