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  1. #1

    Join Date
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    OS SX-H Hyper

    I just bought a raptor with this engine on it.
    Went to the feild and the engine would not start.
    Replaced the glow with a new #8, lights up bright.

    After further investigation, the high speed needle was fully closed and the low speed I have never saw that type before.

    My question is what is the factory settings for the low side? How many turns out from all the way in, closed?
    I've downloaded the manuel and it says center, but does not say what center is...

  2. #2

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    RE: OS SX-H Hyper

    By saying straight up and down on the Low Speed Needle there meaning like in this image.

    High Speed Needle should be 1.5 out from closed.

    This isn't the same Carb but you get the idea.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  3. #3

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    RE: OS SX-H Hyper

    How many turns out does the low speed need to be?
    That is very simular to the carb on my engine. Except the 3rd needle valve.

    I have looked at the exploded diagrams, and there is just a screw and spring on the low side.

  4. #4
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    RE: OS SX-H Hyper

    The idle mixture does not get turned any "number" of turns. When you set the idle mixture screw as shown in the picture posted above, you have it at its starting point, which is the middle of its adjustment range. The idle mixture screw will only turn 90-degees to either side of the middle adjustment point. Turning clockwise will lean the idle mixture, counter-clockwise will lean it.

    If the engine has good fuel, good compression, and a good glow plug, it will run. If it will not fire at all, then it's not getting fuel. If it won't fire and fuel is spraying all over, then it's so rich that it's badly flooded.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com


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