The Lambretta Model D was a scooter produced by Lambretta as a direct replacement for the Model C. The Model D was the first Innocenti scooter to be manufactured outside of Italy as the licence was sold in Europe, Asia and South America.The Model D had a revised steel tubular frame that had been lengthened to make way for new suspension and other small updates. The basic layout of the Model C was kept with a fuel tank under the front seat and a toolbox at the rear of the bike. The front suspension tubes were fully enclosed to hide the spring suspension and hermetically sealed in oil to protect from corrosion. Rear suspension was provided by torsion bar that attached to the engine and frame with the engine pivoted at the front and being used as a swing arm.[3] Early engine mounts (1951 to mid-1952) were just bearings, in mid-1952 they were changed to Silent Blocs to help reduce vibration. A headlamp was attached to the front of the frame with underneath the bicycle styled chrome steel handlebars. A round brake light was attached at the rear of the bike just above the number plate. Brakes were provided by aluminium finned drums with the front being cable operated and the rear rod operated, by a pedal located on the right floor panel.The tyres were 4.00* 8 came out of the factory provided by Italian manufactures Pirelli or CEAT.
Later versions included adjustable aluminium handlebars, plastic levers, lock for toolbox lid, ivory and later white plastic light switch, provisions for a rear damper to be fitted and grab handles on the rear saddle.