It has two screws or at least it should. One with the letter L next to it and the other with the letter H next to it. Turn both in lightly until they seat. Then turn the L screw out 1 1/4 turns and the H screw out 3/4 turn. This should get the unit running unless you have other problems. then fine tuning may be required after you get it running. If it bogs out when throttled turn the L screw out another 1/16 of a turn. Then if it won't rev like it should turn the H screw in 1/16th of a turn.
If this doesn't work then you'll probably need a carburetor kit and tune up.
Good luck
skidooer
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