This ECU can be set in 4 different modes depending on your scooter's setup: for both 50 and 80cc cylinders (with valve springs). For the correct setting for your setup, this ECM has 4 pre-programmed MAPS that can be selected with the included 'Maps selector': *MAP 1: Original cylinder, original or Polini variator, original exhaust pipe, (top speed about 55 km/h) *MAP 2: Original cylinder, Polini variator, Polini exhaust pipe, (top speed approximately 60 km/h) *MAP 3: Polini 78,8cc cylinder, original or Polini variator, original exhaust pipe *MAP 4: Polini 78,8cc cylinder, Polini variator, Polini exhaust pipe. ATTENTION!!! When mounting on a 25 km/h version, it is recommended to install the 45 km/h air filter hose. Not on Vespa model 2024.