Yamaha YZF-R125 Service Manual: Fi system

The fuel pump delivers fuel to the fuel injector via the fuel filter. The pressure regulator maintains the fuel pressure that is applied to the fuel injector at only 250 kPa (2.50 kg/cm², 36.3 psi). Accordingly, when the energizing signal from the ECU energizes the fuel injector, the fuel passage opens, causing the fuel to be injected into the intake manifold only during the time the passage remains open. Therefore, the longer the length of time the fuel injector is energized (injection duration), the greater the volume of fuel that is supplied. Conversely, the shorter the length of time the fuel injector is energized (injection duration), the lesser the volume of fuel that is supplied.

The injection duration and the injection timing are controlled by the ECU. Signals that are input from the throttle position sensor, crankshaft position sensor, intake air pressure sensor, intake air temperature sensor, lean angle sensor and coolant temperature sensor enable the ECU to determine the injection duration. The injection timing is determined through the signals from the crankshaft position sensor. As a result, the volume of fuel that is required by the engine can be supplied at all times in accordance with the driving conditions.

1. Fuel pump
2. Fuel injector
3. Ignition coil
4. Coolant temperature sensor
5. ECU (engine control unit)
6. Lean angle sensor
7. Crankshaft position sensor
8. FID (fast idle solenoid)
9. Air filter case
10. Throttle body
11. Throttle body sensor assembly
12. Intake air temperature sensor
13. Throttle position sensor
14. Intake air pressure sensor

1. Fuel system
2. Air system
3. Control system