Ducati 250 Mark 3D Desmo




Make Model.

Ducati 250 Mark 3D Desmo




Four stroke, single cylinder, Desmo SOHC, bevel gear driven


248.6 cc / 15.2 cu in
Bore x Stroke 74 x 57.8 mm
Compression Ratio 10.0:1
Cooling System Air cooled


Dell'Orto SS1 29D carburetor


Coil, 6V 30W generator (later 6V 70 W)


SAFA 3L3 13.5 Ah

Spark Plug

Marelli CW260N / Lodge 2HN



Max Power

16.4 kW / 22 hp @ 7500 rpm

Primary Drive Ratio



5 Speed

Gear Ratios

1st 2.46 / 2nd 1.73 / 3rd 1.35 / 4th 1.10 / 5th 0.97:1

Final Drive


Final Drive Ratio


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


Rear Tyre



Length: 2000 mm / 78.7 in
Width:    600 mm / 23.6 in
Height: 940 mm / 37.0 in


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 ¼ Mile  

18.9 sec

Top Speed

150 km/h / 93 mph

If you go back to the history of Ducati, you’ll know that the 60’s wasn’t exactly all too kind to the Italian bike maker. With the onus being dubiously put on producing two-stroke bikes, Ducati went back to bikes in the latter part of the decade, developing the "wide-case" single engine in ’67 and ushering a whole new range of bikes that included the Ducati 250 Mark 3.

Despite carrying the same basic overhead-camshaft engine architecture, the 1970 250 Mark 3 featured revised crankcases that were much wider at the rear where it mounted the frame. The sump capacity was increased to 2.5 Litres , and the kick-start was much stronger, as was the new rear frame section. Add all that with a 249 cc SOHC single engine mated to a five-speed transmission and you had a bike that was clearly worth all the attention it received.

In addition to receiving a single filler fuel tank, the 1970 250 Mark 3 also received a speedometer and tachometer mounted on the top triple clamp instead of in the headlight shell.