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Thread: Float Bowl Drain Screw

  1. #1
    Senior Member jannaruto's Avatar
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    Float Bowl Drain Screw

    Hey guys,

    I want to remove that screw to replace with an inoxidable steel one (I am slowly replacing all the screws on the bike, already replaced the whole engine, front fork, front commands, under seat and tail end of the bike)
    I would like to know the size of this screw
    Accounting that my bike is a 1993 with a Keihin carby
    I assume is this screw right? is already stripped as you can see
    WP_20170912_17_37_37_Pro_1505230695519.jpg

  2. #2
    Senior Member SHAG's Avatar
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    That's more than just a screw and very hard to get out when its buggered. Yamaha PN 14T-14104-00-00

    1993 TRAILWAY - TW200E Yamaha Motorcycle CARBURETOR NON CALIFORNIA MODEL Diagram and Parts
    Go like hell, You'll get there quicker!

    2005 BMWR12GS Rock Red 106k miles
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  3. #3
    Senior Member jannaruto's Avatar
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    Quote Originally Posted by SHAG View Post
    That's more than just a screw and very hard to get out when its buggered. Yamaha PN 14T-14104-00-00

    1993 TRAILWAY - TW200E Yamaha Motorcycle CARBURETOR NON CALIFORNIA MODEL Diagram and Parts
    Oh, so its not just a regular M4 screw?
    Also I notice it is called Air screw, I mean I tought that screw was supposed only to be "opened" and let all the fuel out from the bowl, is correct?
    In case it does something more, would be effective to "play" with that screw to improve the TW carburation?
    jtomelliott49 likes this.

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  5. #4
    Super Moderator littletommy's Avatar
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    Fuel will come out if you open it, it lets fuel out the hose on the bottom of the bowl. Here's a pic of it:



    It won't help to adjust the carb.
    Last edited by littletommy; 10-31-2017 at 08:53 PM.
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  6. #5
    Senior Member Fred's Avatar
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    Simple screw extractor will get damaged air screw out. images-2.jpeg
    Screw can be replaced but really needs a JIS , not Phillips, screwdriver to prevent new damage.
    Or one can cleanup up the old screws head ’s a grinder then cut a blade screwdriver bit comparable slot across face of the head. I use a dremel cut off wheel and do a pair of cuts so several blade, #2 phillips, to JIS drivers work. Seat with very little torque!
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  7. #6
    Senior Member phelonius's Avatar
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    It is a screw that showld be opened or removed a couple of times a year just so it doesn't grow roots.
    Phelonius

  8. #7
    Senior Member jannaruto's Avatar
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    Ok yesterday I replaced my screw, I noticed it didn't had the spring on it, while the new purchased one does...
    I wonder why... Maybe the keihin carby does not sport a spring?
    Anyway I put the spring and the new screw back in

  9. #8
    Senior Member jbfla's Avatar
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    Quote Originally Posted by jannaruto View Post
    ........

    Accounting that my bike is a 1993 with a Keihin carby.........

    WP_20170912_17_37_37_Pro_1505230695519.jpg
    Did you install the Keihin carb?

    Just curious as to why it's not a Teikei carb.

    On the TK carbs, the screw for the bowl drain serves two purposes.

    It enables you to open and close the drain to the bowl, and the tapered part allows the overflow tube to drain even when the screw is closed.

    jb
    2018 Triumph Street Twin..............2016 CB500F
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  10. #9
    Super Moderator Purple's Avatar
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    The Keihin carb is standard on his bike ....
    (Warning - Forum may contain nuts) ...... Hidden Content

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  11. #10
    Senior Member jtomelliott49's Avatar
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    Jannaruto, you are from Spain? I think I remember this, but not sure. I'm not a good mechanic, but do wish you the best of luck with this issue. You have the best advice from this forum.
    Tom in Wichita

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