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Ducati had introduced the 350 Sebring in 1967 at the request of their American importer Berliner Motor Corporation (the US was Ducati's primary market at the time). [7] The Sebring was an enlargement of the existing 250 cc model but designer Fabio Taglioni had concerns about the reliability of the bottom end, so the Sebring was produced in a mild state of tune.
They acquired the rights to the Rotax engine-enduro motorcycle SWM XN Tornado from the Italian owners and developed the Armstrong MT500 military motorcycle used by the British Army. For most of the 1980s, Armstrong-CCM produced about 3,500 motocross and trail bikes, as well as military off-road machines. [ 1 ]
Motorcycles with a V-twin engine mounted with its crankshaft mounted in line with the frame, e.g. the Honda CX series, are said to have "transverse" engines, [1] [2] while motorcycles with a V-twin mounted with its crankshaft mounted perpendicular to the frame, e.g. most Harley-Davidsons, are said to have "longitudinal" engines.
The potential of the new machine was found so impressive by Dirt Bike Magazine, they named it Bike of the Year, [13] two years ahead of its release. In February 1999, Dirt Bike editor Ron Lawson was quoted regarding the unreleased bike's possible appeal to "older moto guys who want kind of a status symbol" as opposed to novice motorcyclists. [14]
The 2.75 hp (350cc) with 60.5mm bore and 60mm stroke, with the valves placed side-by-side on the side of the engine. The other engine was the 4 hp (544cc) flat twin of 72mm bore and 68mm stroke. One of the significant differences with this larger engine was the oil was carried in the sump and supplied by pump to bearings and cylinders.
The TD1 bikes had a significant impact on British 250cc class racing in the middle-1960s [1] which was historically contested by single-cylinder engines, some with ageing designs. [2] Some TD1s were overbored to 251cc, thus being eligible for the 350cc class