You have the wheels jacked up in the air or on the ground? Its ok if the wheels move in the air. The weight and ground will add resistance and stop the wheels from turning on the ground. If the bike is on the ground trying to move forward at idle speed then yes something needs adjusted. Make sure the end of the cable is seated properly down inside the rubber boot on top of the carb. Sometimes this can be a tricky spot. The metal ferrule of the cable inserts maybe a 1/2 inch or 1/4 inch down inside a metal tube that is inside the rubber boot.
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