Honda HRZ216TDA Harmony II Owner's Manual page 27

OPERATION
Cutting Width
For an even lawn finish, overlap each mowing swath by a few inches. If
the grass is very tall or thick, use more overlap and a narrower mowing
swath.
Blade Speed
The blade(s) must spin very fast to cut properly. Always use the FAST
throttle setting. If engine speed drops, it could mean the engine is
being overloaded by the blade(s) trying to cut too much grass. Mow a
narrower swath, move the mower slower, install the discharge chute,
or raise the cutting height.
Blade Sharpness
A sharp blade cuts cleanly. A dull blade tears the grass, leaving
shredded ends that turn brown. When your blades don't cut cleanly
anymore, have them sharpened or replaced.
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