Generic TR 125 Service Manual page 142

16.2.2 Oil Injector
16.2.2.1 Working principle of oil injector
Inside the injector surrounding the iron core there is an electromagnetic coil which leads to the two electrodes,
namely, the injector input control interface. When the electromagnetic coil is energized, the generated
electromagnetic force makes the ball valve rise by overcoming the spring force of the ball valve and fuel
pressure, so the high-pressure fuel (250Kpa) inside the fuel pipe can pass through the injector valve seat hole,
flowing through the spray orifice board and forming a conical mist sprayed into the intake valve. When the
injector is in outage, electromagnetic coil's electromagnetic force disappears, and the ball valve of the injector
closes automatically under the action of return spring to make fuel injection action of the injector stop.
16.2.2.2 Appearance of oil injector:
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