O.S. Engines 140RX-FI - Manual (Page 7)

The injector consists of a solenoid valve with built-in regulator. It controls pressurized fuel at a
constant pressure and accurately injects fuel based on signals from the electronic control unit (EC-
Injector Air Valve 70C
Injector
Drive Hub
Crankshaft
Fuel Filter
Check Valve
Y harness
BASIC ENGINE PARTS
Accessories
•Fuel Filter
•Check Valve
•Y harness
Electronic Control Unit
Glow plug TYPE F
Cylinder Head
Crankshaft
Temperature Sensor
Pressure Fitting
Cover Plate
RPM Sensor
•The photograph may differ from the actual product.
Injector
Never attempt to disassemble the injector.
It may not be able to be reassembled.
Temperature Sensor This measures the temperature of the engine exhaust unit.
RPM Sensor
The RPM sensor is provided with a power generating sensor. When the crankshaft passes in front
of the sensor, the signal that is generated is transmitted to the electronic control unit (EC-1).
Engine speed is then calculated based on that signal which is then used to determine the timing at
which fuel is injected.
Electronic Control Unit (abbreviated as simply EC-1)
The EC-1 transmits fuel injection signals to the injector to ensure the proper amount of fuel
injection based on basic fuel injection data that has been previously entered and constantly
changes wuth position of throttle stick. In addition, engine speed and engine temperature during
operation are displayed on the liquid crystal display.
Y harness
Fuel Filter
Check Valve
This cord is used to connect the receiver (throttle channel), throttle servo and EC-
This fine mesh filter prevents foreign matter from plugging the small injector
valve.
This one-way valve's function is to pressurize the fuel tank by crankcase
pressure and prevent fuel from returning to the engine crankcase.
•Driver to push EC-1 keys
•Duble-sided sponge-backed
cushioning tape
INSTALLATION OF THE AIR VALVE
As delivered, the engine has its air valve lightly fitted into its intake boss. Secure it as follows.
Loosen the retainer nut, rotate the air valve to its correct position and make sure that it is pressed
well down into the intake boss, compressing the rubber gasket, before retightening nut.
Rotate the retainer nut gently until it stops, then tighten a further 90-120˚.
Do not overtighten the screw as this will damage the thermo insulator.
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