| Manufacturer | Ducati |
|---|---|
| Production | 1964-1966 |
| Predecessor | Ducati 200 GT |
| Class | Standard |
| Engine | Air-cooled bevel driveSOHCsingle cylinderfour stroke |
| Bore /stroke | 74 mm × 57.8 mm (2.91 in × 2.28 in) |
| Compression ratio | 8:1 |
| Top speed | 74 mph (119 km/h) |
| Power | 18.4 bhp (13.7 kW) @ 7,200 rpm (1964) 22 bhp (16 kW) @ 7,200 rpm (1965/6) |
| Transmission | Multiplatewet clutch, 4 speed (1961-64) 5 speed (1965-68) |
| Frame type | Single cradle |
| Suspension | Front:telescopic forks Rear:swinging arm |
| Brakes | Drum front & rear |
| Tyres | Front: 275x18 Rear: 300x18 |
| Wheelbase | 1,320 mm (52 in) |
| Dimensions | L: 2,000 mm (79 in) W: 580 mm (23 in) H: 1,070 mm (42 in) |
| Seat height | 800 mm (31 in) |
| Weight | 125 kg (276 lb) (dry) |
| Footnotes / references [1][2][3][4][5] | |
TheDucati 250 GT, also known as theDucati Daytona GT in the UK,[2] is a 249 cc (15.2 cu in)single cylinder bevel driveSOHC motorcycle produced by the Italian manufacturerDucati from 1964 to 1966. At the time of its launch it was the least powerful of Ducati's range of 250 cc machines.[6]
Introduced in 1964, the 250 GT was intended to be a replacement for the200 GT although production of the two models overlapped. It was the first Ducati roadster to use the 5 speed gearbox. The chassis was mostly carried over from the 200 GT[7] but with the larger tank of theDiana[8] and the 31.5 mm (1.24 in) Ducati-madeforks of theMach 1. As the yokes of these forks carried no mountings forhandlebars, high swan-neck handlebars were fitted that clamped to around the forks.Crash bars were fitted as standard. The engine was fitted with the soft 'black'camshaft and small 33 mm (1.3 in)valves.[7]
The 250 GT was criticised as being underpowered, so in response Ducati fitted a higher performance 'violet' cam and a larger 37 mm (1.5 in) inlet valve for 1965, making the engine the same specification as theMonza. The 31.5 mm (1.24 in)Marzocchi forks used on the Monza were also fitted but the clip on handlebars were retained, although later that year more conventional handlebars were fitted.[9]
In 1966 the bike was restyled and shared the angular styling of the Monza,Monza Junior andSebring.[1]
The single cylinder bevel drive OHC engine was of a vertically spiltunit construction[10] and had alloyhead and alloybarrels withaustenitic liners.[11]Ball bearings were used in themain bearings androller bearings for thebig end.[12] Hairspring valve springs were used to close the valves.[13] Bore and stroke were 74 mm × 57.8 mm (2.91 in × 2.28 in) giving a displacement of 249 cc (15.2 cu in).Compression ratio was 8:1 and claimed power output was 18.4 bhp (13.7 kW) @ 7,200 rpm.[1] In 1965 the engine was uprated to Monza specification, giving a power output of 22 bhp (16 kW).[4]
Fuel was delivered by a 24 mmDell'Orto UBFcarburettor.[13]Wet sump lubrication was used[14] andignition was by battery andcoil.[15]
Primary drive was by helical gears to amulti-plate wet clutch[16] to a 4 speedgearbox.[15]Chain drive took power to the rear wheel.[17]
Thesingle cradle frame used the engine as astressed member.[18] Rear suspension was byswinging arm with twin adjustableshock absorbers. At the front 31.5 mm (1.24 in)telescopic forks were fitted.[19] Brakes weredrums, the front being 180 mm (7.1 in) diameter and the rear 160 mm (6.3 in).[15]