Specifications: 121 cc single-cylinder OHV four-stroke, four speeds.

The final pushrod overhead-valve Ducati single was the 125 Cadet/4 of 1967 and 1968. Many cycle parts were shared with the two-stroke Cadet, but the engine was still based on the earlier overhead-valve unit. The bore and stroke were changed, as was the cylinder head design. The spark plug was moved to the right, and the two overhead valves were set parallel, rather than opposed as before. The electrical system was shared with the 160 Monza Junior, a flywheel alternator charging a six-volt, 13.5 Ah battery.

The double cradle tubular steel frame was similar to the 125 Bronco, and for 1967 the tires were a smaller profile 2.25 and 2.50x18-inch. Alongside the Cadet/4 was an almost identical Lusso (luxury) variant, with a better front fork and sporting headlight and larger tires. There were only minor changes to the Cadet/4 for 1968, including larger tires, new side-covers and a different paint scheme. These overhead-valve models only lasted two years, primarily because Berliner, the U.S. distributor, decided they were not suitable for the American market. This red and white painted example is original and unrestored.