Lambretta A/B/C/D/E/F/J/Lui
LAMBRETTA
Junior 50 50 ccm 2T AC 1964-1968

LAMBRETTA Junior 50 50 cc 2T AC 1964-1968

Photo from LAMBRETTA Junior 50 50 cc 2T AC 1964-1968 | LAMBRETTA

Overview Lambretta Junior 50

in 1964, the market introduced an innovative series of Lambrettas known as the "i" series (for Innocenti), which was erroneously labelled the "J" series due to the visual similarity of the "i" logo to a "J" (moreover, the "J" does not exist in the Italian alphabet). A prototype of this design had already been presented three years earlier, in 1961, at the Milan Motor Show, although the model that ultimately went into series production had slight differences.

Lambretta Junior 50 model history

The Lambretta Junior 50 was characterised by a monocoque chassis made entirely of pressed steel and a centrally positioned Engine similar in design to the L.i, but with a vertically arranged Cylinder. Three engine variants with 50, 100 and 125 cc were initially offered. The monocoque frame was smaller than on other Lambretta model series, and it was assumed that the J series was primarily aimed at female customers, thanks to its lightness and the use of shorter Gearshifts. Models, with the exception of the Starstream, had no horn cover and there was a plastic Tool box under the Seat, the removal of which gave access to the Air Filter. The Side Panels, which covered the engine compartment and were often fitted with Grips, remained a characteristic feature of the J-series. Depending on the Model, the J offered either one Seat, one single seat or two single seats. The colour scheme of the covers was grey throughout, as on almost all Lambrettas, with the exception of the stands and the kickstart pedal rubber, which were black.
The first examples had 10-inch wheels, but these were changed to 2.75*9. The J50 had a double seat as standard to market the scooter as a cheap means of transport , no speedo, no leg guards and no steering wheel lock, while other changes included a much smaller Rear Light. Although this last item probably cost more, as in its place and in place of the number plate was a fluted plate with a chrome J50 Badge. As for the rest of the Emblem, a one-piece Lambretta J50 emblem was fitted to the Legshields, with an innocenti emblem just below the headset.
The Lambretta De Luxe featured a single front seat and a rear Luggage Carrier, which replaced the passenger carry. The leg covers were given chrome surrounds on this model. The Grips on the side panels were now no longer present and were replaced by a Clip-on type, as found on the larger machines of the time. The floor covering was changed from the earlier plastic floor strips to aluminium gutters with rubber inserts, as on the larger machines. Other changes included the use of 3.00*10 Tyres with aluminium grey painted rims and hubs. The J50 Badge was retained on the Legshields, but the Side Parts were given a De Luxe Badge on both sides, similar to the SX Models of the time.

The Engine of the Lambretta Junior 50

From October 1964, the 50 cc Engine had a three-speed gearbox and reached a top speed of 40 km/h with an output of 1.47 hp.
The three-speed version was replaced by a four-speed model in September 1966, which retained most of the features of the three-speed model. The most significant change was introduced in November of the same year with a new Frame that was stronger than other Models due to consumer concerns. This included a new, thinner double seat, trimmed Legshields and a modified Rear Part. The four-speed model did not gain any speed with the extra gear, but still reached a speed of 40 km/h. The Lambretta J50 4-speed was replaced in January 1968 by the Lambretta J50 De Luxe, which returned to a three-speed gearbox.

Situation used market Lambretta Junior 50

Where do you look for this vehicle?

The colours of the Lambretta Junior 50:

Colour

Colour name

Colour code

Colour info

bianco-nuovo-8059

Bianco Nuovo

8059

De Luxe

verde-mela-8039

Verde Mela

8039

De Luxe

azzurro-acquamarina-8030

Azzurro Acquamarina

8030

De Luxe

viola-palido-8069

Viola Palido

8069

rosso-rubino-8047

Rosso Rubino

8047

verde-oliva-chiaro-8079

Verde Oliva Chiaro

8079

verde-oliva-scuro-8078

Verde Oliva Scuro

8078

turchese-8016

Turchese

8016

Special

rosso-8073-2

Rosso

8073

Special

Giallo Ocra

8080

Special

General Information

  • Producer LAMBRETTA
  • Model Junior 50
  • Displacement 50 ccm
  • Cycles and cooling 2T / AC
  • Year of construction 1964-1968
  • Built quantity 69989
  • Dimension LAMBRETTA
  • Vehicle type Lambretta A/B/C/D/E/F/J/Lui

Years of production & chassis numbers

  • Year of construction:

Technical data

  • Chassis type: open centre tube steel frame
  • Chassis number position: Centre tube Frame under Cover
  • Length: 1660 mm
  • Width: 630 mm
  • Height: 1000 mm
  • Seat height: 770 mm
  • Wheelbase: 1190 mm
  • Weight (empty): 78 kg
  • Performance (PS): 1.47 PS
  • Performance (kW): 1.08 kW
  • at rpm: 4500
  • Top speed: 38.5 km/h
  • Engine type: 2-stroke internal combustion engine
  • Engine manufacturer: Innocenti
  • Engine number: J50
  • position of engine number: upper edge of Crankcase on the right at Kickstart Lever height

Engine - cylinders, clutch & exhaust

  • Displacement: 49.8 ccm
  • Bore: 38 mm
  • Stroke: 44 mm
  • Number of cylinders: 1
  • Transfer ports: 2
  • Type of cooling: Air
  • Compression: 7,8:1
  • Starter: Kickstarter
  • Clutch: Multi-disc clutch in oil bath on Input Shaft

Engine - Carburetor

  • Mixture preparation: Carburetor
  • Type of carburetor: Dell'Orto SHB 18.12
  • Main jet: 62
  • Idle jet: 40
  • Choke jet: 50

Engine - Transmission

  • Type of gearbox: Manual gearstick
  • Number of gears: 3
  • Gear rotation: 1st gear: 10:69 Z (6,90)
  • Gear rotation: 2nd gear: 16:64 Z (4,00)
  • Transmission: 3rd gear: 22:56 Z (2,55)
  • Gear rotation: Total: im 3. Gang: 8,19
  • Transmission: Primary: 14:45 Z (3,21)

Engine - Ignition

  • Ignition type: Interruptor ignition
  • Ignition timing: 21 °
  • Battery voltage: 6 V
  • Charging power (ignition): 18 W
  • Spark plug type: NGK B7ES Bosch W5CC
  • Spark plug thread: long thread

Chassis - tires and rims

  • Front tyre(s): 2,75x9
  • Front rim(s): 1.75x9
  • Rear tyre(s): 2.75x9
  • Rear rim(s): 1.75x9
  • Front tyre pressure: 1,8
  • Rear tyre pressure: 2,5

Chassis - Brakes

  • Brake system: Drum Brake
  • Front brake: Ø inside 150 mm
  • Front brake operation: mechanical with Cable
  • Rear brake: Ø inside 150 mm
  • Rear brake operation: mechanical with Cable

Chassis - steering column & swing arm

  • Front wheel guide: drawn short swing arm
  • Rear wheel guide: Drive set swing arm
  • Front suspension: 170 mm Springs inside
  • Rear suspension: Shock Absorber L 280 mm, separate damper spring

Electronics

  • Alternator: 6V 20W, swing light magneto ignition
  • Headlights: 6V 15W P26s
  • Parking light: 6V 1.5W
  • Taillights: 6V 3W Festoon Bulb
  • Horn: 6V AC

Operating materials

  • Fuel tank capacity: 6.2 l
  • Included reserve: 1 l
  • Mixing ratio: 1:50
  • Range (approx.): 392 km
  • Gearbox oil: SAE 80
  • Amount of gearbox oil: 0.5 l
  • Fuel consumption: 1.58 l/100km

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