Modern Vespa

on my lambrettas you can check the output of the stator plate with a voltmeter to see if oats wrong with the lo voltage regulator etc.The info is easily accessible on the net but i cannot find ant info anywhere to check the staor output on my vespa p200.can anyone help
thx

Courtesy of Disco Dave on SBW;


STATOR VALUES, HOW TO TEST USING A MULTI METER

STATOR VALUES FOR YOUR INFO

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.

a sep cribb as follows
THREE IGNITION GROUPS:
1. green(LT)
2. white(EARTH)
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 metre 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 93-120ohms) if it is outside of this your pickup (halls effect sensor is fucked)

3. green wire (should be 450-540 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.

the stator outout should be 80watts at 5000rpm
although the new replacement after market stator range from 90 watts to 100 wattts the voltage regulator should limit the output voltage to 14.4volts any more and it will fry the system so if its mote you need a new voltage regulator.
Ps most p200 stators are now at an age where they need renewing and really they are not that dear
keeping rolling

Thanks for the great info. I don't need it right now but have copied it to my digital tool box.