Yamaha YBR 125K Owner's Manual page 19

Handlebar switches over rigt
1. ìENGINE STOPî switch, shuts the engine off
"ENGINE STOP" switch
The engine stop switch is a safety device for use in an
emergency such as when the motorcycle overturns or if
trouble occurs in the throttle system. Turn the switch to
ì î to start the engine, and turn the switch to ì
stop the engine.
3-5
î to