TVS Apache RTR 200 4V ABS Race Edition 2.0 Owner's Manual page 56

FUEL COCK
Fuel cock is located on fuel tank at the left side of the
vehicle. Fuel cock has the following three positions,
ON : When the fuel cock is in 'ON' position,
fuel will flow from the fuel tank to the
carburettor.
RES : When the fuel cock is in 'RES' position,
fuel will flow from the reserve fuel supply
of the tank to the carburettor. It is advised
to use the reserve fuel only when the fuel
is not flowing in 'ON' position.
OFF : When the fuel cock is in 'OFF' position,
fuel does not flow from fuel tank to
carburettor.
RES RES
OFF OFF
ON ON
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Warning
Before riding the bike, it is necessary to understand how
to operate fuel cock to avoid sudden stoppage of the
vehicle in traffic, due to no fuel supply.
Note
Leaving the fuel cock in 'ON' or 'RESERVE' position
when the vehicle is not in use may cause the fuel tank
to completely drain out, incase of any malfunctioning of
carburettor float system. Whenever the motorcycle is
not in use ensure to turn 'OFF' fuel cock.
Do not position the fuel cock lever between 'ON' and
'OFF' position as this may drain off entire fuel while
riding the vehicle.