Honda FF500 Owner's Manual page 48

Rotary tines inspection and replacement
Wear heavy gloves to protect your hands.
Carry out the check or replacement work with the tiller on the level
spot and the engine stopped. Disconnect the spark plug cap to
prevent an accidental start-up.
Place a wooden block under the rotary tine to prevent rotary form
dropping.
The inside and outside tines rotate in opposite directions. Be careful
of the movement of the tines when checking or replacing the rotary
part. The rotary tines may turn in an unexpected direction, resulting
injury.
Incorrect arrangement of the tines or installing tines in wrong
direction might case the tiller to move backward or move to an
unexpected direction, resulting injury.
Before starting check or replacement work, set the front wheel to the
lowermost position (for transporting see page 23) and place the tiller
on a firm level ground and secure it not to move.
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