Gilera Runner RST Purejet, Service Manual, Page: 153 / 235

13- Bring the system to pressure again and as
soon as the starter stops rotating, close the com-
pressor connection pipe at the shunting with the
manometer by a flat and long pincer. Check the
pressure progress.
GO TO point 14
GO TO point 15
14- Pressure decreases with the same trend. Check the seals on the injector mounting , replace the air
injector if required.
GO TO point 3
15- Pressure remains unchanged. The compressor unidirectional valve is not efficient. Replace the
volumetric compressor
GO TO point 3
16- Refit the ignition spark plug and connect the cap. Connect the following connectors:
- H.V. coil
- Fuel injector
- Air injector
Use the diagnostic tester to remove the faults registered during pressure check.
GO TO point 17
Specific tooling
020460Y Scooter diagnosis and tester
17- Start the engine and check the air pressure with engine idle and free from loads at medium rpm.
Standard air pressure = 5 ÷ 5.5 bar (500 ÷ 550 Kpa)
N.B.
AIR PRESSURE DURING THE ENGINE OPERATION IS FAIRLY CONSTANT SINCE THE IN-
CREASE OF CAPACITY OF THE PUMP IN RELATION TO THE INCREASE OF RPM IS PARTLY
COMPENSATED BY THE LONGER OPENING TIME OF THE AIR INJECTOR. TO CONFIRM THIS,
CHECK THAT THE PRESSURE INCREASES UP TO ABOUT 8 BAR (800 KPA) AFTER SWITCHING
TO THE "OFF" POSITION WHEN THE ENGINE RUNS AT HIGH RPMS.
air injector circuit
TERMINALS: 1 - 13
CONDITIONS: Engine stopped, switch in any position
STANDARD VALUES: Battery voltage
Runner RST Purejet
pure jet injection
INJ PJ - 41