Yamaha XZ550RJ 1982 Owner's Manual page 39

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2. To reinstall the tank cap, set the cap in
the filler neck and rotate the cap 1 / 4
turn clockwise. Lock the cap by turning
the key 1 / 4 turn clockwise, and remove
the key.
WARNING:
Be sure the cap is properly installed and
locked in place before riding the motor-
cycle.