Honda HARMONY II HRS216PDA Owner's Manual page 22

OPERATION
Drive Clutch Lever (SD)
DRIVE CLUTCH LEVER (SD)
Push the drive clutch lever forward
and hold it against the handlebar
to propel the mower forward.
Release the drive clutch lever to
stop the mower's forward
movement.
Always release the drive clutch
lever before starting the engine. If
the drive clutch is engaged, the
mower will move forward when
you operate the starter.
Operate the drive clutch lever with a quick and complete motion, so
the drive clutch is either fully engaged or released. Hold the drive
clutch lever against the handlebar during self-propelled mowing. This
will help to extend the service life of the clutch mechanism.
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