O.S. Engines FS-91 II FI - Manual (Page 6)

6
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-2).
Injector
Air Valve 60T
Injector
Drive Hub
Crankcase
BASIC ENGINE PARTS
Accessories
Fuel Filter
Check Valve
Y harness
Electronic Control Unit<EC-2>
Glow plug
TYPE F
Cylinder Head
Temperature
Sensor
RPM Sensor
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-2).
Engine rpm are then detocted based on that signal which is then used to determine the timing at
which fuel is injected.
Electronic Control Unit<EC-2> (abbreviated as simply EC-2)
The EC-2 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 with position of throttle stick.
Y harness
Fuel Filter
Check Valve
This cord is used to connect the receiver (throttle channel), throttle servo and EC-2.
This fine mesh filter prevents foreigh matter from the fuel tank 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 Limit
Setting Switch
Duble-sided sponge-
backed cushioning tape
Lock Nut
Propeller Nut
Propeller Washer
Beam Mount
Glow plug TYPE F
F-4020 Silencer
EC-2 Assembly
Rocker Cover