Rubber Plug inside Carb Help Please! QWERTY??
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  1. #1
    Member Quicksand's Avatar
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    After cleaning previously on carb I lost the rubber plug that goes inside the carb and it covers something right by the main jet and the pilot jet. So the question is does that plug play a role and cause problems if not there? Also, can you buy an o ring from a parts store for the pilot set screw, it is almost cracked into. I assume that may be why I am having starting problems.

  2. #2
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Quicksand View Post
    ... So the question is does that plug play a role and cause problems if not there?...
    Hope you don't mind if I'm not Qwerty.



    That rubber plug covers a fuel pick up tube for the choke. There is another fuel pick up tube for the choke right next to it.



    I don't know why one is covered by a rubber plug. And I would be more than curious to know if the carb would still work properly without the plug.



    BTW, the plug is about $5.00 plus shipping, depending where you purchase it. I'm thinking a creative mind could find a way to plug that hole without spending $5.









    Quote Originally Posted by Quicksand View Post
    Also, can you buy an o ring from a parts store for the pilot set screw, it is almost cracked into
    I have looked at Lowe's, Home Depot, and Ace Hardware for an o-ring that small without any luck. Maybe a specialty parts supplier may have one.



    Maybe McMaster-Carr or Small Parts.



    http://www.mcmaster.com

    http://www.smallparts.com/



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

  3. #3
    Member Babaganoush's Avatar
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    That's a beautiful 'pro' photo of the carb jb and nice labels too! VWD



    Dave

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  5. #4
    Senior Member phelonius's Avatar
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    Use a hole punch of the correct size to cut a plug from a piece of neoprene if you have some.

    Brass tubing at hobby shops is available in many sizes. Cut a short piece and chuck it into a lathe or drill press chuck.

    As it spins, file it to a cutting edge. It will be good enough to cut a couple of plugs to try out.

    If you want a more permanent tool , use steel.



    Phelonius
    Phelonius

  6. #5
    Senior Member Gerry's Avatar
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    I have some neoprene and also a punch set... give me an O.D. and punch one out and drop it in the mail. Gerry



    PS.. I have made a punch on the 'qt' from a socket. I place an extention on the socket. This allows me to carefully turn the OD lip against a fine grinding wheel. I am able to put a nice edge on the lip of the socket. For me, this has never weakened the socket for it's intended use, yet is certainly robust enough to punch thru tuff material. On many sockets, the facets seem to have a slight taper and recess and for me, are not reproduce in the stamping.




    Take care my Friend.........

  7. #6
    Senior Member jbfla's Avatar
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    The rubber plug is a hair over 7mm in diameter (6mm on tapered end), 4mm thick, and slightly tapered.







    The hole it goes into is exactly 7mm. It's a very tight fit.







    The only way I was able to remove the plug was by blowing compressed air into one of the carb holes (I don't remember which one). And if you aren't paying attention, that rubber plug will go flying, never to be seen again.



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

  8. #7
    Member Quicksand's Avatar
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    JBFLA,



    Thank you for the info. I think I might have found the plug. Does it look like a T with the top just a little bit wider than the rest of the plug. What I have is solid rubber about 1/4" long and a little flange around the top to make it seal up inside the hole I suppose. I put it in there and it will fit if I press the edges down inside. If we have a side view of it I would know. I will try to get a picture on here to make sure.

  9. #8
    Member Quicksand's Avatar
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    JBFLA,

    You were posting as I was typing. What I have doesn't look like that and from what I can tell it will touch the fuel pickup for the choke. Will that be OK or will it be blocking air somehow?

  10. #9
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Quicksand View Post
    JBFLA, ... it will touch the fuel pickup for the choke. Will that be OK or will it be blocking air somehow?
    From what I can tell, without sawing the carb body in half, the 2 choke fuel pickups join together. The one under the plug appears to be completely blocked off by the plug and doesn't do anything.



    I'm not sure why Yamaha plugged up the hole. Maybe that was easier than redesigning the carb.



    The only way to know for sure is to try the carb on the bike, with and without the plug. I would try it myself but my TW is in NC for the winter, and I'm in FL.



    I did remove the carb and bring it with me, to give it a thorough cleaning.



    Edit: the 2 choke fuel pickup tubes do join together. I was able to shine a light down one tube, and see the light through the other one.



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

  11. #10
    Senior Member jbfla's Avatar
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    Quicksand,



    I ordered a bag of o-rings for the pilot screw from McMaster-Carr. I think I will have a few extras. They come in a bag of 100.



    Hopefully I ordered the correct size. If you don't mind waiting until I receive them, I'll send a couple your way. Just PM me your mailing address.



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

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