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    Rotax 503 not starting

    Trying start my engine for first time but will not start. Have spark and fuel, some backfire through carbs. Help please?! I have a primer pump no choke cables...
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    Blade flap???

    New to the game and read a lot of theads talking about blade flap. Can someone please explain to this novis ( Pictures for the big words ;-) <Altitude measured by Attitude>
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    IVOPROP adjustment

    I have a Gyrobee w/503/bbox, and ivoprop. i read somewhere that there is a procedure to adjust the prop at a certain rpm to get thrust set properly (measured with a scale). any input? Altitude measured by attitude