Honda NAVI NVA110B 2022 Owner's Manual page 30

Fuel Valve
The three-way fuel valve is used to control
the flow of fuel from the fuel tank to the
carburetor.
(On)
(On): normal position for riding.
(Off): for parking, storing, or
transportation.
(Res): for extra fuel to get to a gas station
for refueling.
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(Off) (Res)