Vespa GTS / GTV / GT 125 – 200cc Immobilizer Bypass CDI


Immobilizer Bypass CDI for Water Cooled Vespa and Gilera Scooters.

Removes the immobilizer from older Vespa and Gilera Scooters (2000 – 2009)

e.g. GTS 125cc, GTV125cc, GT125 and GT200. Gilera Runner

(Will not work with Electric Fuel Pump Models)


Important: Will not work with the Euro 3 (electric fuel pump) models. Please Check Carefully.

Simple Plug and Play replacement CDI that removes the Immobilizer from Water Cooled 4 Valve Vespa Scooters.

Fits the Water cooled models, such as the Vespa GTS125 and Vespa GT125 / GT200.

Also compatible with the 150cc models sold in some overseas markets such as the USA.

Only suitable for the older Carburettor Models, Circa 2000 to 2010.

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

Fits: (Will not work with Electric Fuel Pump Models)

  • Vespa GTS125cc / 150cc (2003 – 2009)
  • Vespa GTV125 / 150cc (2005 – 2009)
  • Vespa GT125 / GT200 (2003 – 2009)
  • Some Piaggio Water Cooled 125cc models (B125, Beverley 125cc etc. Check Part Numbers)

Replaces the following CDI Part Numbers:

Magneti Marelli ACI603, ACI604


EFI Technology AC5i, AC8i

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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