MV Agusta 125 Motore Lungo

The MV Agusta 125 Motore Lungo (long engine), more commonly known as the "carter lungo" (long crankcase), was a 125 cc, lightweight two-stroke motorcycle manufactured between 1950 and 1953 by Italian motorcycle manufacturer MV Agusta.[1] The machine was often used in racing.

MV Agusta 125 Motore Lungo
MV Agusta 125 Motore Lungo "competizione", MV Agusta Museum of Cascina Costa
ManufacturerMV Agusta
Production1950–1953
PredecessorMV Agusta 125 "4 velocita"
ClassSport bike
Engine123.5 cc Two-stroke
Bore / stroke53 × 56 mm
Compression ratio9:1
Top speed120 km/h
Power12 bhp @ 9000 rpm
Ignition typeMagneto
TransmissionWet multi-plate clutch, 4 gears, chain drive
Frame typeDouble cradle frame
SuspensionFront: Girder forks
Rear: Swinging arm with friction dampers
BrakesDrum brakes: 190mm front, 160 mm rear
Tires2,75 x 19 front & rear
Wheelbase1300 mm
Weight95 kg (dry)
Fuel capacity14 l
Footnotes / references
[1][2]

History

MV Augusta started making lightweight motorcycles in 1946. In 1948, a 125 cc class was added to the Italian national motorcycle racing championship (Campionato Italiano di Velocità). MV produced a 3 speed two-stroke machine to compete in this class, the 125 "Valenza". This was superseded in 1949 by the 125 "4 velocita" (4 speed).[3] For 1950, the improved 125 "Motore Lungo" was introduced, which produced 12 bhp @ 9000 rpm.[4]

Details

The term "long engine" derives from the elongated crankcase in front of the cylinder, which housed a special Magneti Marelli magneto.[5] The previous model, the 125 "4 velocita", was retrospectively known as the "short crankcase" to differentiate it from the "long crankcase".

The engine was an air-cooled single-cylinder two-stroke with a bore and stroke of 53 × 56 mm giving a displacement 123.5 cc. The compression ratio was 9:1, and the engine was fed by a Dell'Orto SS 25 A carburetor.

A Wet multi-plate clutch was driven by gears from the crankshaft, and a four-speed gearbox sent drive to the rear wheel by chain.

The MV Agusta had a double cradle frame and girder forks. At the rear there was a swinging arm with friction dampers. Drum brakes were fitted front and back, 190 mm diameter at the front and 160 mm at the rear.

Two versions of the bike were made: the road version, complete with lights, and the sports version, called the "competizione" (competition) model.

Racing

The machine was especially popular in the national 125 cc racing class, where its characteristics of competitiveness and low price appealed to the needs of those who were beginning their career as a rider,[2] and it became the most popular sports bike of the time.[6]

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References
  1. "MV Agusta 125 engines Lungo". www.mv-agusta-club.de. MV Agusta Club Deutschland. Retrieved 25 June 2019.
  2. "Alcuni modelli di moto MV Agusta da competizione" (PDF). trattoridepocapiacentini.it. Retrieved 25 June 2019.
  3. "MV Agusta - Christchurch, New Zealand". www.firsteuropean.co.nz. First European. Retrieved 25 June 2019.
  4. The Motorbike Book: The Definitive Visual History. Dorling Kindersley Limited. 2012. ISBN 9781409378853.
  5. "The Boom Of The 50s". MV Agusta London. 29 October 2014. Retrieved 25 June 2019.
  6. "The boom of the 50s". MV Agusta Australia. 31 December 2013. Retrieved 25 June 2019.
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