Gilera Runner RST Purejet, Service Manual, Page: 114 / 235

Introduction
EMS injection system
The injection system has an incorporated injection and ignition.
Injection is direct and pneumatic, by air electro-injector and fuel electro-injector.
Injection and ignition are phased on the 2T cycle by a phonic wheel on the flywheel and phase rpm
sensor with reluctance variation.
Fuel preparation and ignition are controlled on the basis of the engine rpm and of the gas valve opening.
Further correction is made according to the following parameter:
coolant temperature.
The ECU stabilises the idle at 2000 RPM for any temperature of use, by suitably managing the air
injector controls, fuel injector and HV coil. Fuel preparation therefore changes according to the use
temperature.
During running, fuel preparation is controlled on the basis of the engine rpm signals, coolant tempera-
ture, and gas valve position in relation to preset mapping.
The fuel injection circuit consists of:
- Fuel filter
- Pump feeding duct with auto-bleeding
- Fuel pump
- Fuel injector
- Pressure regulator
The injector mounting is connected by two snap on pipes. The continuous circulation prevents the fuel
from boiling. The pressure regulator is placed in output of the injector mounting . The fuel pump is
controlled by the ECU; this ensures safety of the vehicle.
The power supply circuit consists of:
- Volumetric compressor with unidirectional valve controlled by the eccentric on the crankshaft
- Flexible lines connecting to the injector mounting
- Pressure regulator
- Air injector
The ignition circuit consists of:
- ECU
- H.V. coil
- H.V. cable
- Shielded cap
- Spark plug
The ECU controls the ignition with an optimum control of the advance and of the coil core dwell time.
The ECU injection-ignition system controls the engine functions by a default program. This injection
system achieves great results as regards:
pure jet injection
Runner RST Purejet
INJ PJ - 2