Piaggio Liberty, Fly, Skipper ST125 125cc Immobilizer Bypass CDI


Immobilizer Bypass CDI for Piaggio Scooters.

Removes the immobilizer from older Piaggio Scooters (2000 – 2009)

UK Stock, Free 1st Class UK Shipping.


Simple Plug and Play replacement CDI that removes the Immobilizer from older Piaggio Scooters.

Fits the Aircooled models, such as the Piaggio Liberty 125cc and Skipper ST125.

Also fits a number of Vespa models.

Only suitable for the older Carburettor Models, Circa 2000 to 2008.

Very useful if you have lost your keys or the original immobilizer CDI has failed.


  • Piaggio Liberty 125cc (2000 onwards)
  • Piaggio Skipper ST125 (2000 onwards
  • Vespa ET4 125cc / 150cc (2000 – 2006)
  • Vespa LX125 / LX150 (2005 – 2009)
  • Vespa LXV125 / LXV150 (2008 – 2009)
  • Vespa S 125 (2007)

Replaces the following CDI Part Numbers:

Magneti Marelli ACI600, ACI601, ACI602 ACI603


EFI Technology AC1i, AC2i, AC3i or AC5i

Not suitable for the pre-LEADER engines. (1996 – 2000)

NOTE: This CDI will bypass your immobilizer. Once fitted the scooter will no longer have an immobilizer.

Any key that can turn the ignition barrel will start the scooter!



Remove the original CDI and bolt this bypass CDI onto the same mountings.

Plug in the 8 Pin Connector into this replacement CDI.

Leave the smaller 3 pin connector disconnected.

Start the engine!

Additional information


CDI Technology

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