Modern Vespa

It won't go!!!
No spark and no flashing led.
Tried another cdi and no change, the led doesn't do anything...
So if it's not the cdi has anyone got any idea what it could be?

have a look at hte fuse under the seat / if not that have a look at your imobiliser { there are ways on the net on how to bypass it } also cheack the ht lead , plug cap ect to make sure it is connected properly {unlikely tho}

There's a good chance it's related to the RPM pickup on the flywheel. There is a magnetic sensor (built into the stator assembly) that detects a raised section on the outer face of the magneto. If one or both becomes corroded, the ECU doesn't know where TDC is and won't fire the plug. Occasionally cleaning the corrosion with a wire brush and setting the gap will do the trick. Otherwise, the bad part(s) must be replaced.