Question about 2002 Hyosung Comet 125

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Hyosun Scooter Carb Adjustments

I was having a hard time getting the scooter started. Cleaned plug, changed fuel, cleaned carb with spray, and air filter. Have adjusted carb and it running much better. There are two screws for adjustment. I assume one on top is for idle and second below is fuel mixture. I also assume turning it in makes it leaner. What steps do you recommend to adjust both and are my assumptions correct?

Thanks

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  • Fred Almgren
    Fred Almgren Jun 27, 2009

    Great and thanks. Am I correct that the idle screw is probably the top screw adjustment

  • barry142 May 11, 2010

    hi sun 125 scooter engine turns over but will not fire

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Very good thought process on the adjustments. The throttle screw sets the idle speed and the air screw sets the fuel mix at idle speed. The stock setting is 1.5 turns outward. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward.

From this point you adjust the idle speed then adjust the air screw for fastest idle speed at that throttle screw setting. If the idle speed becomes faster than desired after adjustment, just reset the throttle screw and then reset the air screw.

A “very helpful” rating for this answer? Thanks!

Posted on Jun 27, 2009

  • tombones Jun 27, 2009

    That is normally the case. The slide inside the carb touches the end of the throttle stop screw. Screw it inward and the slide goes upward to increase speed. The throttle stop screw will show major speed increase / decrease when turned. tha air screw will not.



    I don't get paid for my answers but I do take pride in them, I just try to help where I can. So if you feel it is right, > > A “very helpful” rating for these answers? Thanks!

  • Daniel Hymer
    Daniel Hymer Feb 26, 2014

    You can't see any adjustment screw on the carb of a 2006 Polaris ranger 4x4,looks like the throttle cable goes right in to to carb,I need to find the idle screw.

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I have a scooter and I've changed the plugs, carb, filters and the gas. It starts but stalls, I then have to wait a few minutes before it will start again. can you help with any other suggestions. Thanks

Posted on Jun 28, 2009

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