Английская Википедия:Ducati 250 GT
Шаблон:Short description Шаблон:Use dmy dates Шаблон:Use British English Шаблон:Infobox motorcycle The Ducati 250 GT, also known as the Ducati Daytona GT in the UK,Шаблон:Sfn is a Шаблон:Convert single cylinder bevel drive SOHC motorcycle produced by the Italian manufacturer Ducati from 1964 to 1966. At the time of its launch it was the least powerful of Ducati's range of 250 cc machines.Шаблон:Sfn
History
Introduced in 1964, the 250 GT was intended to be a replacement for the 200 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 GTШаблон:Sfn but with the larger tank of the DianaШаблон:Sfn and the Шаблон:Convert Ducati-made forks of the Mach 1. As the yokes of these forks carried no mountings for handlebars, 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 Шаблон:Convert valves.Шаблон:Sfn
The 250 GT was criticised as being underpowered, so in response Ducati fitted a higher performance 'violet' cam and a larger Шаблон:Convert inlet valve for 1965, making the engine the same specification as the Monza. The Шаблон:Convert 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.Шаблон:Sfn
In 1966 the bike was restyled and shared the angular styling of the Monza, Monza Junior and Sebring.Шаблон:Sfn
Technical details
Engine and transmission
The single cylinder bevel drive OHC engine was of a vertically spilt unit constructionШаблон:Sfn and had alloy head and alloy barrels with austenitic liners.Шаблон:Sfn Ball bearings were used in the main bearings and roller bearings for the big end.Шаблон:Sfn Hairspring valve springs were used to close the valves.Шаблон:Sfn Bore and stroke were Шаблон:Convert giving a displacement of Шаблон:Convert. Compression ratio was 8:1 and claimed power output was Шаблон:Convert @ 7,200 rpm.Шаблон:Sfn In 1965 the engine was uprated to Monza specification, giving a power output of Шаблон:Convert.Шаблон:Sfn
Fuel was delivered by a 24 mm Dell'Orto UBF carburettor.Шаблон:Sfn Wet sump lubrication was usedШаблон:Sfn and ignition was by battery and coil.Шаблон:Sfn
Primary drive was by helical gears to a multi-plate wet clutchШаблон:Sfn to a 4 speed gearbox.Шаблон:Sfn Chain drive took power to the rear wheel.Шаблон:Sfn
Cycle parts
The single cradle frame used the engine as a stressed member.Шаблон:Sfn Rear suspension was by swinging arm with twin adjustable shock absorbers. At the front Шаблон:Convert telescopic forks were fitted.Шаблон:Sfn Brakes were drums, the front being Шаблон:Convert diameter and the rear Шаблон:Convert.Шаблон:Sfn
References
Bibliography
