Honda HS521 Owner's Manual page 37

3. Remove the spark plug cover and spark plug and pour three tables-
poonsful of clean motor oil into the cylinder. Pull the starter grip slowly
two or three times to distribute the oil. Reinstall the spark plug.
S\PARK PLUG COVER
4. Pull the starter grip until resistance is felt. This closes the valves and
protects the engine from internal corrosion.
STARTER GRIP
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