Ducati 250 Formula 3

 

 

 

Make Model.

Ducati 250 Formula 3

Year

1960 - 62

Engine

Four stroke, single cylinder, SOHC, shaft and bevel gear driven, 2 valves per cylinder

Capacity

248.6 cc / 15.2 cu in
Bore x Stroke 74 x 57.8 mm
Compression Ratio 8.5:1
Cooling System Air cooled

Induction

Dell'Orto SS1 29A carburetor

Ignition

Battery and coil

Starting

Kick

Max Power

17.2 kW / 23 hp @ 8200 rpm

Clutch

Multi wet plate, wet

Transmission

4 Speed

Final Drive

Chain
Frame Single cradle tubular frame

Front Suspension

Hydraulic telescopic fork

Rear Suspension

Swingarm, dual shocks

Front Brakes

Drum

Rear Brakes

Drum

Front Tyre

2.50 -19

Rear Tyre

2.75 -19

With production of the overhead camshaft singles well underway for 1958 the Formula 3 superseded the Marianna (the Gran Sport's nickname) as a catalogued production racer. Offered initially as a 125 and 175 (and from 1960 as a 250), the F3 was still largely based on the Marianna." Almost nothing from the production street 250s was used in the F3 and as further evidence of this uniqueness, virtually no engine gaskets were interchangeable with the production OHC single. The UK version was known as the 250 Manxman F3

The frame, although inspired by the road version, was quite different being both lower and lighter, with a lower steering head, shorter 35mm Marzocchi steel fork legs, and shorter swing arm, too. Plus 19in wheels for the 250. The 175 motor would not fit the 125 frame, and come to that, the 250 wouldn't go into either. "Although the F3s were genuine factory racing machines they suffered through being too expensive for most privateers, and were penalized by the 4-speed gearbox." Production of all three capacity F3s together was very small, perhaps less than 100, with perhaps only as few as five or six 250s.

Source: Bonhams and Standard Catalog of Ducati Motorcycles, 1946 - 2005, Ian Falloon