The most important change on the new FD models was moving the load carrying compartments to the rear of the vehicle, a single wheel was now at the front with the load carrying two wheels at the rear.
The front end of the FD was taken directly from the D model of scooter, the frame was made up by a single large section of tubing which was attached through various welds to some rectangular tubes to make the base of the load carrying section.
Now the mechanicals of the new design could not drive the rear wheel directly, a new transmission was designed which used a shaft, differential and two axles to move the scooter along.
The 125cc engine still did not gain much power the prevoius models, top speed toped out at a maximum speed of just over 30mph (45kmh). Front drum brake was operated from the lever on the handle bars, whilst the two rear brakes we operated by a hydrualic set up.
Still Innocenti did not really improve on the options you could order the FD in, chassis only, wooden box, ali box and wooden pick-up. The wooden pick up model was the most popular choice, probably due to its lowest cost and its varity of uses. The chassis only option was also popular with people out side suppliers of different options, and finally the 125 FD became opposition to the lucrative market share held by the Piaggio's Ape and Guzzi the wheelers.
Imporoved performance came with the new 150FD model, meaning more speed but more importantly improved load carrying. Front suspension was also reinforced, although rear bascically stayed the same. In four years of production the FD's did recieve some modifications during production, starters were improved along side the LD/D models improvements, wheel nuts and studs increased for better saftey.