Ryobi RBC254SBSO Operator's Manual page 37

Deutsch (Übersetzung der originalen Anleitungen)
3. 3. Pull the rubber protect boot upward to release the
hook.
4. Twist the metal spark plug boot and pull it away from
the spark plug.
5. Loosen the spark
counterclockwise direction using a combination
wrench. Remove the old spark plug and replace with
a new one. Assemble back the metal spark plug boot
and the rubber protect boot.
English (Original instructions)
plug by turning it in a
35