Fuel Cock - Yamaha YBR 125K Owner's Manual

Fuel cock

The fuel cock supplies fuel from the tank to the carburetor
while filtering it also.
The fuel cock has three positions:
OFF: With the fuel cock in this position, fuel will not flow.
Always set the fuel cock to this position when the
engine is not running.
ON: With the fuel cock in this position, fuel flows to the
carburetor. Set the fuel cock to this position when
starting the engine and while riding.
RES: This indicates reserve. If you run out of fuel while
riding, set the fuel cock to this position.
Fill the tank at the first opportunity. be sure to set
fuel cock back to ìONî after refueling!
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