Toro 74182 Operator's Manual page 23

POTENTIAL HAZARD
If you leave the key in the ignition switch, someone could start the engine.
WHAT CAN HAPPEN
Accidental starting of the engine could seriously injure you or other bystanders.
HOW TO AVOID THE HAZARD
Remove the key from the ignition switch and pull the wire(s) off the spark plug(s)
before you do any maintenance. Also push the wire(s) aside so it does not
accidentally contact the spark plug(s).
Maintenance
21