VESPA AND LML STATOR VALUES
HOW TO TEST USING A MULTI METER
the LML stators are identical except for the push connectors to the piaggio versions. The following tests can be carried out to a Piaggio Vespa stator in exactly the same way.
In terms of wires:-
THREE IGNITION GROUPS:
1. green(LOW TENSION)
3. red (CDI trip wire)
TWO LIGHT GROUPS:
4. black (EARTH)
5. blue (UN REGULATED AC)(more you rev the engine more voltage it makes)
To test the ignition (set multi-meter to resistance ohms) put your black probe to the white cable (earth) and then make circuits with your red probe to:
1. engine case (should be short circuit or less than 1ohm). if not you have no earth continuity.
2. red wire (should be 105 -120ohms) if it is outside of this your pickup (halls effect sensor is fucked) If the reading is zero you have a short-circuit in the stator, if the reading is infinity (ie the highest on the meter)- you have broken windings
3. green wire (should be 480-540 ohms)if values fall outside of this your single ignition coil winding is damaged.
To test the lighting groups put your black probe to the black (earth) cable, then:
4. test to engine case, again this should be a short circuit less than 1 ohm.
last test on blue cable, start engine, set metre to AC voltage metre.
5. on engine idle it should be pumping out minimum of 21-38 volts at 600 rpm + you can get peak voltage to these values on a good kick of the starter pedal if you take the spark plug out first.
all these values are common on all electronic vespa stators. In addition to the above electrical tests you should physically inspect your stator. Look for breaks in windings, loose studs, dry soldered joints etc.
Simple really - and you can buy an analogue multimeter form places like Machine mart of less than £6.
I found this here - http://www.louthscooterists.co.uk/index.php/tech-help/did-you-know/