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Thread: 17 ktm 50 sx sputtering top end

  1. #1

    Default 17 ktm 50 sx sputtering top end

    2017 ktm 50 sx sputtering on the top end. Carb has been cleaned more than once, reeds inspected, new CDI/stator. That didnít help so then I replaced the top end on it and still am having the issue. Next Iím thinking of replacing the crank seals. Any ideas on the cause? Also Iím linking a video of the bike. Thank you

    https://youtu.be/w3lxi4DY1IA
    Last edited by Jsippola; 03-22-2020 at 05:38 PM.

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  3. #2

    Default Re: 17 ktm 50 sx sputtering top end

    Sounds rich, what is your jetting and needle ? Also check the ignition woodruff key.
    Bye bye France, finally back to Texas !

  4. #3

    Default Re: 17 ktm 50 sx sputtering top end

    Main jet is a 90 and first notch on needle. Was running fine on this setup.

  5. #4

    Default Re: 17 ktm 50 sx sputtering top end

    I guess you already did the spark plug...Check that the choke is closing correctly, the o'ring get sticky sometimes or it is just worn out. Worn atomizer and/or needle maybe. It is good to replace these parts every 50 hours at least. Moped store like Treatland.tv has them at a good price and fast shipping.
    Bye bye France, finally back to Texas !

  6. #5

    Default Re: 17 ktm 50 sx sputtering top end

    Just had this issue as well on 2018 found the stator or voltage reading below required power...it wasn't totally gone yet. Replaced it and ran perfect....

  7. #6

    Default Re: 17 ktm 50 sx sputtering top end

    Just replaced that probably two weeks ago. I hope it hasnít gone bad already.

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