stripped out bowl drain screw
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  1. #1
    Senior Member phazer's Avatar
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    i was just wondering if the drain screw for the carb bowl is a special type of screw? can i just put in a set screw with matching threads? i have not gotten the screw out yet so im not really sure what it looks. all the diagrams i see are not good for viewing finer details. i cant imagine why it was put in that tight in the first place, its almost like the screw has thread locker on it. the material the screw is made out of seems to be very soft and stripped with the first turn, are they aluminum?

  2. #2
    Senior Member assquatch20's Avatar
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    It's a JIS screw. You can read about it here. A normal phillips head will strip it because it's not deep at the center. The best way to get those if you don't have a set of JIS drivers is to just use a flathead with care (EDIT: or grind down a phillips head driver a bit flatter.)



    A normal screw might work, but I think the issue is that they won't seal well enough to keep from draining.

  3. #3
    Senior Member n2o2diver's Avatar
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  5. #4
    Senior Member wayne's Avatar
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    mr zannini, the bowl drain screw is not just a regular screw it's more like a needle valve, but they are cheap from the dealer. The number is 4JP-14104-00.

    Wayne.

  6. #5
    Senior Member jbfla's Avatar
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    Quote Originally Posted by mr zannini View Post
    i was just wondering if the drain screw for the carb bowl is a special type of screw?
    Yes.



    It has a rounded end to close off the passageway that drains the bowl.



    Just before the rounded end, the screw is tapered so that when the the screw is fully closed, fuel from the overflow tube can still flow around the screw and out the drain.



    See screw at lower left of photo.



    jb



    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  7. #6
    Senior Member phazer's Avatar
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    thanks for the replies everyone. very helpfull. hopefully ill be able to get it out. it dont seem like its something id wanna have to drill out.

  8. #7
    Senior Member jbfla's Avatar
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    Quote Originally Posted by mr zannini View Post
    thanks for the replies everyone. very helpfull. hopefully ill be able to get it out. it dont seem like its something id wanna have to drill out.
    It's not absolutely necessary that you remove the drain screw. As long as you can remove the bowl (replace the bowl screws), you can accomplish the same draining of the bowl, and make sure the overflow tube is not clogged. It will just take a bit longer.



    jb
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  9. #8
    Senior Member gfletcb's Avatar
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    I ended up replacing mine as I stripped it a bit trying to drain the bowl before my jet change experiment. Much easier with the bowl off the carb and on a bench so you can get some leverage on it.

    5 or 6 bucks for the kit that will come with a couple extra washers you wont need.

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