Honda XR250R Owner's Manual page 29

FUEL
Fuel Valve
The three way fuel valve (1) is on the left side
near the carburettor.
OFF
At OFF, fuel cannot flow from the tank to the
carburettors. Turn the valve OFF whenever the
motorcycle is not in use.
ON
At ON, fuel will flow from the main fuel supply
to the carburettors.
RES
At RES, fuel will flow from the reserve fuel
supply to the carburettors. Use the reserve fuel
only when the main supply is gone. The reserve
fuel supply is 1.5L (0.4 US gal). Refill the tank
as soon as possible after switching to RES.
Know how to operate the fuel valve
while riding the motorcycle. You may
avoid a sudden stop in traffic.
Be careful not to touch any hot engine
parts while operating the fuel valve.
NOTE:
Do not operate the motorcycle with the
fuel valve in the RES position after
refuelling. You may run out of fuel with
no reserve.
(1) Fuel valve
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