Honda CRF230F 2017 Owner's Manual page 101

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Remember to check that the fuel valve is in the ON
position each time you refuel. If the valve is left in the
RES position, you may run out of fuel with no reserve.
ON OFF
(1)
(1) Fuel valve
RES
Fuel Tank
The fuel tank capacity including the reserve supply is:
7.0 liters (1.85 US gal; 1.54 Imp gal)
To open the fuel fill cap (1), pull out the breather tube
(2) from the steering stem nut (3). Then turn the fuel
fill cap counterclockwise.
Do not overfill the tank. There should be no fuel in
the bottom of the filler neck (4).
After refueling, be sure to tighten the fuel fill cap firmly
by turning it clockwise. Insert the breather tube into
the steering stem nut.
(2)
(3)
CRF230F
(1) Fuel fill cap
(4)
(2) Breather tube
(3) Steering stem nut
(4) Bottom of the
filler neck
(1)