1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 25Get this manual

1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 25

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dSet the motor idle speed to the specified level by adjusting the throttle stop screwTurning the throttle stop screw in (clockwise) increases the motor speed; turning it out (counterclockwise) decreas