Honda Harmony HRB216TDA Owner's Manual page 11

Fuel Valve
The fuel valve opens and closes the fuel passage from the fuel tank to
the carburetor.
Throttle Lever
The throttle lever controls engine speed and opens and closes the
choke.
THROTTLE LEVER
CHOKE
FAST
SLOW
Closes the choke; use when starting a cold engine.
For restarting a warm engine and for mowing.
For idling the engine.
CONTROLS & FEATURES
OFF
ON
FUEL
VALVE
9