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  1. #1

    Carb adjustments

    I have a 1999 Genesis ,I just rebuilt the carbs and was told that there are 2 idle adjustment screws, I found one near the top on the left side of the carbs but cannot locate the other , any ideas where it might be ?

  2. #2
    casey67's Avatar
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    There is a "idle speed adjustment " screw located on the front carb, made of plastic.

    There are 3 "low speed mixture" screws 1 near the bottom of each carb. On 99 Keihin carbs there should be no screw near the top.
    Take a picture of your carbs-these PWC are 20 years old-plenty of time for people to change pieces.

  3. #3
    Thank you ,next question , do I adjust these 3 screws while its running in water . Do I adjust these first then the big screw.

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    casey67's Avatar
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    The low speed MIXTURE screws have a factory recommended "base" setting. Of course every carb/pwc might need fine tunning after that. The MIXTURE screws adjust how much fuel is added at low speeds.

    "BIG" screw sets idle speed of the engine.


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