Re: 125 WITH NO SPARK
Posted: 17 Sep 2021 11:52
Hi Bill
I think you are in danger of overthinking this, slacken the stator screws which since its a scooter you can do in situ
move the stator clockwise 12 degrees relative to the rotor (so trigger is later), you can make some marks on the rotor to help, 36 degrees is the distance from ANT to PMS, so as Ming says 1/3 of that is how much the stator needs to move.
That could be quite a lot - not sure if the slots in the stator plate can go that far, I suggest go as far as you can and try there first.
No new permanent marks on the rotor needed. You will make a new mark on the stator and a corresponding mark on the crankcase if there isn't one handy for alignment should you ever remove the stator eg for belt replacement, its arbitary where you make the marks, so long as you know to align them after belt replacement.
Likely a standard rotor fitted to probably thousands of small Italian motorcycles. The stator is more than likely the same design as a Vespa with a 100 ohm magnetic pickup but made to fit Moto Morini crankcases.
The rotor has no effect on ignition timing.
32398 112 21 02 ignore the last four digits they are a YY MM date code.
The advance range when running is more or less the same for the blue transducers as the black ones, perhaps a little less.
cheers
Mark
I think you are in danger of overthinking this, slacken the stator screws which since its a scooter you can do in situ
move the stator clockwise 12 degrees relative to the rotor (so trigger is later), you can make some marks on the rotor to help, 36 degrees is the distance from ANT to PMS, so as Ming says 1/3 of that is how much the stator needs to move.
That could be quite a lot - not sure if the slots in the stator plate can go that far, I suggest go as far as you can and try there first.
No new permanent marks on the rotor needed. You will make a new mark on the stator and a corresponding mark on the crankcase if there isn't one handy for alignment should you ever remove the stator eg for belt replacement, its arbitary where you make the marks, so long as you know to align them after belt replacement.
Likely a standard rotor fitted to probably thousands of small Italian motorcycles. The stator is more than likely the same design as a Vespa with a 100 ohm magnetic pickup but made to fit Moto Morini crankcases.
The rotor has no effect on ignition timing.
32398 112 21 02 ignore the last four digits they are a YY MM date code.
The advance range when running is more or less the same for the blue transducers as the black ones, perhaps a little less.
cheers
Mark