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Thread: re-jetting carb

  1. #1
    Junior Member Reelsretreat's Avatar
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    re-jetting carb

    I recently did a hollow mod on my bike and installed a cone type air filter. Obviously, I'm now getting a lot more air, and was wondering, do I need to increase gas flow or decrease? The bike runs ok, but seems a little sluggish at low rpm's. Anyone who's done this, approximately what size jet did you install?

  2. #2
    Senior Member Zack's Avatar
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    What year is your bike? There are two styles of carburetors, depending on the year. 1987-2000 is one style, and newer than that is the other.

    I would advise you to buy 2 or three different sizes of jets. If your bike is pre 2001, I believe a 114 jet is stock, and then I would buy a 116, 118, and 120 or so. I don't know much about the newer style carb as I've never owned or seen one. Mess around with the different sizes and see what works best for you. I am running a uni pod filter and am running a size 115 jet on my 98, but I live at 5500 feet, so at sea level I would go much higher.

    Welcome to the forum!

    Zack
    Last edited by Zack; 05-05-2014 at 07:05 PM.
    Zack

  3. #3
    Junior Member Reelsretreat's Avatar
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    Zack, it's a 2012, so I guess I need to find out the stock size and then buy up 2 or 3 sizes. Thanks, it's a start.

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  5. #4
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Reelsretreat View Post
    Zack, it's a 2012, so I guess I need to find out the stock size and then buy up 2 or 3 sizes. Thanks, it's a start.
    Stock main jet on the newer CV carb is 126 on the non-Caifornia, and 128 on the Cali carb. A130 main jet seems to work well on a TW in a stock configuration...might be a good starting point.



    Generally, more air means you need more fuel.

    jb
    Last edited by jbfla; 05-06-2014 at 08:36 AM.
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  6. #5
    Junior Member Paladin's Avatar
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    If you want it to run better with better throttle response at lower RPM's replace the pilot jet with a #54 From an XT. It also starts easier and warms up faster. I did that mod with a completely stock motor and I still get 77-80 MPG.

  7. #6
    Senior Member Zack's Avatar
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    Quote Originally Posted by Paladin View Post
    If you want it to run better with better throttle response at lower RPM's replace the pilot jet with a #54 From an XT. It also starts easier and warms up faster. I did that mod with a completely stock motor and I still get 77-80 MPG.
    I forget, what is the stock pilot jet size? Do the two different styles of carbs have different pilot jets? I should know this but a vicious vortex of forgetfulness enveloped my brain just now.

    Zack
    Zack

  8. #7
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Zack View Post
    I forget, what is the stock pilot jet size?

    Zack
    Stock pilot jet for the CV carb is a #31.

    This is a #34 should the OP wish to try it.



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

  9. #8
    Senior Member frog13's Avatar
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    I switched my main jet out to a #130 ( yes, I shimmed the needle and turned out the pilot screw) and I'm between 400ish too 1200 ft above sea level and the bike "seems" to run well . I presume if it is running well ,don't mess with it . TW starts fine, so ,me changing out the pilot jet to a larger size could open up pandora's box.....right ?. TIA

  10. #9
    Member ilbiker's Avatar
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    Interested in this myself.

  11. #10
    Senior Member jbfla's Avatar
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    Quote Originally Posted by frog13 View Post
    ....... I presume if it is running well ,don't mess with it......
    AMEN!

    Hi Frog,

    If you need to turn your pilot screw out more than 3 or 4 turns, you may need a larger pilot jet. This should not be necessary on a stock bike, and may indicate there is a problem with the pilot circuit.

    The OP is doing a hollow mod, so he will need to experiment with different jets, and go through the tuning procedure with each change, to account for the increased airflow.

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

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