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Thread: Carb questions

  1. #1
    Senior Member RisingSun's Avatar
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    Bought a K&N pod filter and a supertrapp muffler. Now when I let off the gas I get a poping sound. Do I need to get a bigger jet cause the air and exhaust flow is better? Arizona is the area by the way.

  2. #2
    Senior Member pgilles's Avatar
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    Yes, and you should install it yesterday. And you'll need to alter your mixture screw.
    Sold bike.



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  3. #3
    Senior Member sorethumb's Avatar
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    I am adding a Beams style low header/exhaust and K&N pod. I am planning on starting out with a 118 jet and will tune from there. I have also turned my mixture screw to 2.5 turns out as a base point as well. YMMV.
    Custom 1998 TW200 Build Thread Hidden Content | 2003 TW200 | 2009 KLX351

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  5. #4
    Senior Member phazer's Avatar
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    sorethumb, i had the same popping issue as you have now. first i tried just a carb jet which was the #130, still popped on decel. then i shimmed the needle with one .020 inch shim, still popped. then went up to a #132 jet and two .020 inch shims and now all is well. like some of the advanced members say, do little steps until you find the sweet spot.

  6. #5
    Banned qwerty's Avatar
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    mr zaninni speaks wisdom. Make adjustments one step at a time as long as results are positive. Main jet first, then needle shims, then pilot screw.




  7. #6
    Senior Member sorethumb's Avatar
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    Mr Z., I think you meant to address Rising Sun, not me. Your advice is spot on though-I intend to adhere to Qwerty's carb tuning bible.



    If my bike is making popping sounds at the moment, it's more than a carb problem...



    Custom 1998 TW200 Build Thread Hidden Content | 2003 TW200 | 2009 KLX351

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