Vespa LX Series User Manual

2. Speed sensor
3. Engine temperature sensor
4. Immobilizer aerial
5. Stop buttons
6. Fuse No. 1; 20A
7. Key switch contacts
8. Fuse No. 3; 10A
9. Fuse No. 6; 15A
10.Engine control telltale light
11.Fuse No. 2; 7.5A
12.Injection load remote controls
13.Fuse No. 4; 10A
14.Starter button
15.Start-up remote control switch
16.Diagnostics socket output
17.Starter motor
18."IMMOBILIZER" led
19.Fuel pump
20.HV coil
21.Injector
22.Lambda probe
23.Headlight remote control
Troubleshooting procedure
Engine does not start
ENGINE DOES NOT START IF ONLY PULLED
Possible Cause
Operation
Immobiliser enabling signal System not encoded
System not efficient, repair according to the indications of the
self-diagnosis
Presence of faults detected by the self diagnosis Pump relay
HV coil
Injector
Revolution timing sensor
Fuel system Fuel in the tank
Fuel pump activation
Fuel pressure (low)
Injector capacity (low)
Power to the spark plug Shielded spark plug cap HV coil (secondary insulation)
Parameter reliability Engine temperature
Distribution timing - injection ignition
Intake air temperature
End of compression pressure End of compression pressure
Vespa LX 125 - 150 i.e. Injection
INJEC - 153

Vespa LX Series Specifications

General

Displacement	124 cc
Cooling System	Air-cooled
Front Tire	110/70 - 11"
Rear Tire	120/70 - 10"
Seat Height	785 mm
Kerb Weight	114 kg
Wheelbase	1, 280 mm
Length	1, 770 mm
Width	705 mm
Height	1, 140 mm
Engine Type	Single-cylinder, 4-stroke
Fuel System	Carburetor
Max Torque	10.4 Nm @ 6, 000 rpm
Transmission	Automatic
Front Suspension	Single-sided trailing arm with hydraulic shock absorber
Rear Suspension	Hydraulic shock absorber
Front Brake	200mm disc brake
Rear Brake	110mm drum brake