The Ducati 250 Mark 3D Desmo motorcycle was produced from 1968 to 1969 and had a four-stroke, single-cylinder Desmo SOHC engine with a capacity of 248.6 cc. It had a compression ratio of 10.0:1 and used a Dell’Orto SS1 29D carburetor. The ignition system consisted of a coil and 6V 30W generator, later upgraded to a 6V 70W system, and a SAFA 3L3 13.5 Ah battery. The bike had a kickstarter and could produce a maximum power of 16.4 kW or 22 hp at 7500 rpm. It had a five-speed transmission, with gear ratios ranging from 2.46 to 0.97:1. The final drive was via chain, with a final drive ratio of 2.812:1. The front suspension was a hydraulic fork system, while the rear suspension used a swingarm with Marzocchi dual shocks that could be three-way adjusted. The front and rear brakes were drums, with sizes of 180mm and 160mm, respectively. The bike had a length of 2000 mm, width of 600 mm, height of 940 mm, and a wheelbase of 1360 mm. Its dry weight was 127 kg, and its fuel capacity was 13 L. The bike could reach a top speed of 150 km/h and complete a standing quarter-mile in 18.9 seconds.
Technical specifications:
Make Model: Ducati 250 Mark 3D Desmo
| Year | 1968 – 69 |
|---|---|
| Engine | Four stroke, single cylinder, Desmo SOHC, bevel gear driven |
| Capacity | 248.6 cc / 15.2 cu in |
| Bore x Stroke | 74 x 57.8 mm |
| Compression Ratio | 10.0:1 |
| Cooling System | Air cooled |
| Induction | Dell’Orto SS1 29D carburetor |
| Ignition | Coil, 6V 30W generator (later 6V 70 W) |
| Battery | SAFA 3L3 13.5 Ah |
| Spark Plug | Marelli CW260N / Lodge 2HN |
| Starting | Kick |
| Max Power | 16.4 kW / 22 hp @ 7500 rpm |
| Primary Drive Ratio | 2.500:1 |
| Transmission | 5 Speed |
| Gear Ratios | 1st 2.46 / 2nd 1.73 / 3rd 1.35 / 4th 1.10 / 5th 0.97:1 |
| Final Drive | Chain |
| Final Drive Ratio | 2.812:1 |
| Front Suspension | Hydraulic fork, Ducati 31.5 mm |
| Rear Suspension | Swingarm, Marzocchi dual shocks, 3-way adjustable |
| Front Brakes | 180mm Drum |
| Rear Brakes | 160mm Drum |
| Front Tyre | 2.75-18 |
| Rear Tyre | 3.00-18 |
| Dimensions | Length: 2000 mm / 78.7 in Width: 600 mm / 23.6 in Height: 940 mm / 37.0 in |
| Wheelbase | 1360 mm / 53.5 in |
| Seat Height | 735 mm / 28.9 in |
| Dry Weight | 127 kg / 280 lbs |
| Fuel Capacity | 13 L / 3.4 US gal / 2.9 Imp gal |
| Standing 1/4 Mile | 18.9 sec |
| Top Speed | 150 km/h / 93 mph |
