A faulty ignition switch seemed unlikely, but I disconnected the green "kill" wire at the CDI just to make sure. After making all the troubleshooting checks you did, I removed the stator plate under the flywheel, and found that most of the wires to the coils had lost their insulation, especially the green one from the white wrapped ignition charging coil. I end up replacing the entire stator plate, and since then, no more ignition issues. You may want to inspect your stator plate, if it is still the original one, before buying that CDI. I end up replacing the entire stator plate, and since then, no more ignition issues.The engine heat is the biggest killer on the engine wiring on these motors.
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Genuine Piaggio Ducati CDI/CoilFor Vespa PX models this necessary for the conversion from points to electronic ignition. 4 pin spade connections* fits Vespa PX & T5, will also fit PK and earlier models of Vespa e.g. GTR, Sprint, Super and Rally where electronic ignition us used also Piaggio Ape. Piaggio 244128
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