PIAGGIO USA, Inc. Training Material for Vespa ET2/ET4 INDEX FAULT FINDING .. 3 SYMPTOMS ..3 POSSIBLE REASONS 3 TESTS. ..3 Choke staying on ..3 Carburetor flooding .3 Faulty vacuum tap ..3 Air filter clogged .3 AUTOMATIC CHOKE OPERATION 4 OPERATION ..4 Vespa ET2 50cc engine ..4 Vespa ET4 150cc LEADER engine .4 FAULTS .4 To check if the choke unit is operating ..4 Diagram 1 Choke unit operation ..5 To check the choke circuit 5 Diagram 2 Choke unit power supply. Vespa ET4 5 Diagram 3 Choke unit power supply. Vespa ET2 6 Diagram 4 Checking carburetor fuel level 6 150cc L.E.AD.E.R. Engine 7 IGNITION, CHARGING IMMOBILIZER .7 Ignition. .7 Immobilizer 7 Indicators. ..7 Choke unit ..7 Carburetor choke. 7 TESTING ..8 Immobilizer 8 Examples .8 Stator. 9 Vespa Assistenza 1 August, 2002 CDI. ..9 HT Coil 9 WHAT TO DO IF YOU NEED TO CHANGE AN ET4 LOCK BARREL .. 10 IF YOU DO NOT HAVE THE ORIGINAL RED KEY 10 IF YOU HAVE THE ORIGINAL RED KEY .10 L.E.AD.E.R. 150cc IGNITION/CHARGING .. 11 ET2 CHARGING CIRCUIT 12 ET2 ET4 FUEL GAUGE SENDER AND CIRCUIT . 13 L.E.AD.E.R. 150cc ENGINE SECTION . 14 VESPA ET2 CRANKSHAFT COMPONENTS Range 3.9 .. 15 ET2/4 SPECS. CHART 16 ASSISTENZA TECHNICAL INFORMATION BULLETINS . 17 NUMBER 001, OCTOBER 2001 ..17 Vespa ET4 sealed battery .17 NUMBER 002, OCTOBER 2001 ..18 Vespa ET2 ET4 carburetors 18 ET2 Carburetor Problems ..18 ET4 Carburetor Problems ..19 NUMBER 003, OCTOBER 2001 ..20 Programming ET4 immobilizer system ..20 NUMBER 004, DICEMBER 2001 22 Vespa ET2 spare parts catalog update ..22 Vespa Assistenza 2 August, 2002 FAULT FINDING ENGINE RUNNING RICH SYMPTOMS. Vehicles will not start or has cut out and will not restart The plug is found to be very black and fouled. High fuel consumption The plug is found to be very black and fouled. Black/badly carboned spark pl