Purpose of blind end rubber tube on intake manifold?
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Thread: Purpose of blind end rubber tube on intake manifold?

  1. #1
    Member like2wlz's Avatar
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    Purpose of blind end rubber tube on intake manifold?

    Anyone know what the ~18" rubber tube that goes from the intake just past the carb and runs on top of the frame tube. Has a metal stopper at the end of it. I'm tempted to remove it and just put a vacuum cap on the inlet but I'm not sure what function the tube has. I was thinking some remnant of a tank evap tube or something, like might be required for a Calif bike?
    Badgerflorida likes this.

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    Senior Member mountain yawp's Avatar
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    I have wondered the same thing, but don't have an answer for you.
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  3. #3
    Member like2wlz's Avatar
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    It gets in the way trying to tilt the carb but it wasn't easy to remove from the intake nipple because it was so baked on. I cut the end off to remove it but put it back on after working on the carb. just plugging the nipple would be easier especially with road/trail side carb work.

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    Senior Member vanillagorilla1's Avatar
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    should be the vacuum line on a cali model. mine used to have the whole set up at one time and that line went to the canister on the side of the frame and the canister was connected to a bung on the bottom of the tank as well. my vote is pull that sucker off and cap it.
    Badgerflorida likes this.
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    Senior Member Fred's Avatar
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    The tube and it’s aluminum fitting supposedly act like a surge tower, sort of like a boost bottle on older two strokes. It is a small plenum chamber that helps lessen the effect of pressure surges fed back through intake manifold at beginning of compression stroke permitting greater constant velocity through the carb. Leave it alone, it is not part of emissions control nor a vent.
    Mel, admiral, like2wlz and 5 others like this.
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    Senior Member mountain yawp's Avatar
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    Thanks Fred, makes sense.

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    Member like2wlz's Avatar
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    ^^^^^

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    Senior Member vanillagorilla1's Avatar
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    whew glad youre on top of things fred. Ive certainly been wrong before. I have an old style carb and suspect thats why my answer came up different.
    Ken likes this.
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    82 honda gl500 silver wing. sold to a new home 11-24-17
    03 ducati monster 800sie. full rebuild and a danger to the public Hidden Content for sale

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    Senior Member Fred's Avatar
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    VanillaGorilla, there certainly is a carb to emissions canister line as you say. I was thinking of the larger hose that runs from intake manifold up spine of frame under the tank. I had just heard somewhere years ago it was a pressure pulse surge line, and I certainly may be misinformed.
    Ken likes this.
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  11. #10
    Senior Member vanillagorilla1's Avatar
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    Id be interested to see what that looks like. I definitely dont have that on mine. you guys and your fancy new fangled schtuff.....
    93 tw. running like clockwork
    225 6 speed complete!
    82 honda gl500 silver wing. sold to a new home 11-24-17
    03 ducati monster 800sie. full rebuild and a danger to the public Hidden Content for sale

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