Weird carb hose
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Thread: Weird carb hose

  1. #1
    Senior Member 805gregg's Avatar
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    I removed my stock gas tank, and found an unused hose that goes from in front of the carb, like on top of the mount, up along the frame to a spot near the steering head then has a plug installed? What the hell is this?

  2. #2
    Senior Member lizrdbrth's Avatar
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    It's a resonator.



    Sings to your valvetrain. Sounds like Manilow. Ignore it.



    r80rt and BUMBLESPECIMOODA like this.
    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  3. #3
    Senior Member 805gregg's Avatar
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    Yamaha parts manual calls it intake manifold pipe, but why install it then cap it off?

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  5. #4
    Senior Member lizrdbrth's Avatar
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    It does a couple of things. Reduces intake noise and in theory it stores air between intake cycles. It's a good thing.



    I can vouch that it does what it's designed to do in terms of noise reduction. Late model bikes run quieter and with less mechanical noise than older models, and this is the only mechanical difference between them other than the cam chain tensioner. Any contribution it makes to performance would require dyno runs.



    It's definitely a potential intake leak.



    You could run an early intake to eliminate it entirely, but since it actually does something I'd leave it rather than cap it off, if only because vacuum caps tend to lose their seal and degrade quicker than decent hose.



    r80rt likes this.
    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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