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Thread: Carb mods

  1. #1
    Senior Member 805gregg's Avatar
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    I've got my new main jets, a 130 and 132.5, and float bowl gasket, what do I need to change in there? I know there is a good write up, but I can't acess it. The search function isn't working. I know I need to raise the needle valve, how much? I'm at sea level? Which main jet, and whats the correct idle screw adjustment. Anyone else have problems with this site? Slow and lost site?

  2. #2
    Senior Member jbfla's Avatar
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    Here's the link to Centerline's rejetting thread.



    http://tw200.forumotion.com/technica...hange-t152.htm



    I don't know why it's on the other TW site and not here, since it was originally posted on this forum.



    Oh! ... and you might need a finishing nail.



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

  3. #3
    Banned qwerty's Avatar
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    https://tw200forum.com/index.php?/topic/647-carb-tuning/



    It's in the Technical Help forum, second pinned thread.



    Nobody can predict exactly what your carb will need. Too many variables as far as condition of your bike, weather, quality and type of fuel, how you ride, etc. Assuming 2001 or newer, a good place to start is 288−14343−66 .JET, MAIN (#132), one flat washer under the needle, pilot jet 2.75 turns out. From their adjust to the way the bike responds while riding. The above linked thread lists characteristics of a poorly tuned carb




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  5. #4
    Senior Member thumper's Avatar
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    Quote Originally Posted by qwerty View Post
    https://tw200forum.com/index.php?/topic/647-carb-tuning/



    It's in the Technical Help forum, second pinned thread.



    Nobody can predict exactly what your carb will need. Too many variables as far as condition of your bike, weather, quality and type of fuel, how you ride, etc. Assuming 2001 or newer, a good place to start is 288−14343−66 .JET, MAIN (#132), one flat washer under the needle, pilot jet 2.75 turns out. From their adjust to the way the bike responds while riding. The above linked thread lists characteristics of a poorly tuned carb


    While your in there I'd replace the air mixture screw assembly. Its only about $12 bucks. There is a very tiny rubber o-ring at the very end of it. sometimes gets lost, dried out, crushed, etc.

    It only comes with the complete assembly.

    screw/spring/washer/o-ring

    and... I'd run 2oz of sea foam to a full tank of gas to clean everything else out.

    then...I'd run 1/2 oz of Marvel Mystery Oil in every tank thereafter to keep things clean.

    Good luck

  6. #5
    Senior Member jbfla's Avatar
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    Quote Originally Posted by igofar View Post
    ... There is a very tiny rubber o-ring at the very end of it. sometimes gets lost, dried out, crushed, etc.

    It only comes with the complete assembly.
    I recently purchased a bag (100) of those tiny o-rings from McMaster-Carr. I'd be happy to send one along (while supplies last) to anyone in dire need.



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

  7. #6
    Senior Member 805gregg's Avatar
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    Perfect, guys thanks for the links, that's just what I needed, I'll print them for future refrence. Hey jbfla I'll take one of those o-rings, if you have any left. PM me

  8. #7
    Member Raven332's Avatar
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    Guys need a little help. I did the 130 Main jet. raised the needle by .05. The only thing I did not do was to drill the hole to 7/16 first of all I didnt have the drill bit and I have being sick. I couldnt get to town to purchase one. Is this going to affect the bikes performance. I putt it all back together in the garage and it started without using the choke and it sound it even more sponky than usual. But again I was not able to take it for a ride, too cold and I dont feel good.

    Erod
    Blueduce likes this.

  9. #8
    Senior Member jbfla's Avatar
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    Quote Originally Posted by 805gregg View Post
    .. Hey jbfla I'll take one of those o-rings, if you have any left. PM me
    Sent you pm



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

  10. #9
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Erod View Post
    ... The only thing I did not do was to drill the hole to 7/16 ...Erod
    Erod, my memory is failing me rignt now. Where did you get the 7/16 number? That sounds quite large for the hole into the vacuum chamber.



    The number that sticks into my mind is 1/8". If you make the hole too large there won't be enough vacuum to raise the slide (and drilling the hole is irreversible).



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

  11. #10
    Member Raven332's Avatar
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    Wow, I am glad I didnt make it then. It is on the centerline web that you post it above(post #2). Look at the pictures and it shows the drill area and 7/16 drill bit. Do I need to drill the hole? and if I do could you tell me what is the correct drill bit.

    Thanks,

    Erod

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