Float Chamber Gasket
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Thread: Float Chamber Gasket

  1. #1
    Senior Member Rockit's Avatar
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    Float Chamber Gasket

    While adjusting the throttle RPMs on my '10 TW I noticed some fuel seeping out of the float chamber seal. Pretty sure I need to replace the float chamber gasket. Can I do that without removing the carburator? I did a search and couldn't find any info for just changing this gasket.
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  2. #2
    Senior Member Fred's Avatar
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    Float chamber gasket may be replaced with carb on bike. Loosen rubber boots slightly to allow carb to be rotated a bit to reveal screw heads. Most TWs come with JIS screws for the float chamber which we tend to exchange for socket head screws for ease of subsequent removal. Hex head fasteners don’t work in that there is not sufficient clearance for a socket on the hex head.
    2003 TW200 "Betty Boop"
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  3. #3
    Senior Member socalnative's Avatar
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    Be careful when removing the float bowl screws.

    If you drop one on to the top of the motor/trans, specifically right next to the wires running from the stator, it could fall into the opening that the wires come out of.

    With luck you may be able to fish it out but I wasn't able to do it with various tools and using a magnet.
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    Senior Member phelonius's Avatar
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    Put duct tape over the openings that the screws may fall into. It may seem a bit anal , but it's still better than a fallen screw gravitating into the un reachable places to cause future problems. A fallen part or screw will make great efforts to go to the most in-accessible place possible, be it a remote dark corner of litter or a part of the machine where it can grind up other parts.
    Phelonius

  6. #5
    Senior Member Fast Eddie B's Avatar
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    Help me out here...

    If the float is properly sealing off the needle and seat, should not the fuel level in the bowl remain well below the level of the gasket?

    Not saying a new gasket is not a good idea, but wondering if the seeping might be indicative of something else.
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  7. #6
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Fast Eddie B View Post
    Help me out here...

    If the float is properly sealing off the needle and seat, should not the fuel level in the bowl remain well below the level of the gasket?

    Not saying a new gasket is not a good idea, but wondering if the seeping might be indicative of something else.
    On the 2001 and newer carbs the proper level of the fuel in the bowl is .5 mm to 1.5 mm above the seam of the bowl and the carb body.




    In addition, make sure the gasket has the flat side with the ridge facing up, or it will leak.





    jb
    Last edited by jbfla; 05-31-2017 at 09:20 PM.
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  8. #7
    Member m0t0-rydr's Avatar
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    Bike on the level the fuel level will be below the float bowl gasket.
    On the side stand maybe not so much so.
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    '06 TW Moose skid, Protaper ATV Mid, Acerbis handguards, IRC pegs, folding shifter, Hella +30% bulb. USB/voltmeter, cig lighter socket, tachometer. Oil cooler, .70Kg springs & emulators, 19Kg (red) shock spring, Happy Trails Racks, Roto-pak fuel mount, tool tubes, Shinko 5" front, High front fender.
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  9. #8
    Senior Member Fast Eddie B's Avatar
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    jbfla - that's fascinating.

    I just assumed that the float level would always be somewhere in the bowl, not above it. Such is the case with the BING's I dealt with on airhead BMW's and now on the ROTAX aircraft engine I maintain.

    As a word of caution, if you want a gasket to stick in place, just use a light coating of grease. When gas hits it it just dissolves. One time I used a thin coat of silicone gasket maker, and this happened:



    Pretty sure that's what caused a "pucker moment" over the woods of S GA. The silicone gasket goop turned to jello, and I think a glob got sucked into the main jet with obvious, though fortunately temporary, results!
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  10. #9
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Fast Eddie B View Post
    jbfla - that's fascinating.

    Pretty sure that's what caused a "pucker moment" over the woods of S GA. The silicone gasket goop turned to jello, and I think a glob got sucked into the main jet with obvious, though fortunately temporary, results!
    Would love to hear about your flying adventures.....former private pilot myself...no longer can pass the physical.

    Sent you. PM.

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

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