Lambretta A/B/C/D/E/F/J/Lui
LAMBRETTA
Junior 125 125 ccm 2T AC 1964-1969

LAMBRETTA Junior 125 125 cc 2T AC 1964-1969

Photo from LAMBRETTA Junior 125 125 cc 2T AC 1964-1969 | LAMBRETTA

Overview Lambretta Junior 100 & 125

The "cento" or "hundred" refers to its engine displacement of 98 to 100 cc, although the model was officially known as the J98 and a variant with a larger 125 cc engine was known as the J125. These models were characterised by a steel monocoque frame with two Side Parts and the absence of a horn casting.

Model history Lambretta Junior 100 & 125

The rear suspension, which was directly connected to the Engine - similar to larger Models - allowed swivelling mounting by means of front Holders. However, the Spring and damping units were designed as two separate components, and the engine mounts did not provide a particularly smooth ride, as many machines tended to vibrate. The front suspension consisted of a trailing arm with Springs built into the front fork, sitting on Fitting Rubber Buffers, with 3.00*10 Tyres and Drum Brakes front and rear. Production of the J100 ended in November 1965 after 17,642 units, while production of the J125 continued until October 1966. Although the J-series was not a resounding success overall, it nevertheless demonstrated Innocenti's willingness to diversify in order to increase customer satisfaction and boost sales and profits from its product range.

Model history Lambretta Junior 125 Starstream and Super Starstream

To keep the J-series alive, Innocentis launched the next model in May 1966: the Starstream. Although it was very similar to the J100/125, a redesign gave the Starstream a swivelling front Mudguard, which was separated from the Legshields to make it more streamlined, a new seat mounting and a locking horn, although there was nothing underneath. Early examples retained the grippy Side Panels Trims, while later models were fitted with clip-on Side Panels Trims. The bolted fork bumpers were replaced by clip-on parts. The Engine was basically a J125, but with four gears. With the change to four gears, the Starstream and Super Star stream had pretty good acceleration and a top speed of 88 km/h. The Starstream and Super Starstream were built side by side and production ceased in April 1966.

The Engine of the Lambretta Junior 100 & 125

They were equipped with a two-cylinder engine in vertical design, similar in construction to the Li series, but combined with a 3-speed gearbox. The 98 cc model achieved an output of 4.7 hp and a maximum speed of 74 km/h, while the 125 cm variant with 5.8 hp achieved a speed of 86 km/h, making it competitive with larger models.

Situation used market Lambretta Junior 100 & 125

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The colours of the Lambretta Junior 100 & 125:

Colour

Colour name

Colour code

Colour info

grigio-metalizzato-8060

Grigio Metalizzato

8060

azzurro-metalizzato-8062

Azzurro Metalizzato

8062

Bianco Nuovo

8059

blu-041

Blu

041

General Information

  • Producer LAMBRETTA
  • Model Junior 125
  • Displacement 125 ccm
  • Cycles and cooling 2T / AC
  • Year of construction 1964-1969
  • Built quantity 37706
  • 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: 1690 mm
  • Width: 630 mm
  • Height: 1020 mm
  • Seat height: 770 mm
  • Wheelbase: 1190 mm
  • Weight (empty): 90 kg
  • perm. total weight: 230 kg
  • Performance (PS): 5.8 PS
  • Performance (kW): 4.27 kW
  • at rpm: 5300
  • Top speed: 68.9 km/h
  • Engine type: 2-stroke internal combustion engine
  • Engine manufacturer: Innocenti
  • Engine number: j125 (3-Gang) bzw. 125-4 (4-Gang)
  • position of engine number: right-hand side Engine in the area of the switching scale

Engine - cylinders, clutch & exhaust

  • Displacement: 122.5 ccm
  • Bore: 57 mm
  • Stroke: 48 mm
  • Number of cylinders: 1
  • Transfer ports: 2
  • Type of cooling: Air
  • Compression: 7,5:1
  • Starter: Kickstarter
  • Clutch: Multi-disc clutch in oil bath on Input Shaft

Engine - Carburetor

  • Mixture preparation: Carburetor
  • Type of carburetor: Dell'Orto SHB 16.18
  • Main jet: 72
  • Idle jet: 40
  • Choke jet: 50

Engine - Transmission

  • Type of gearbox: Manual gearstick
  • Number of gears: 4
  • Gear rotation: 1st gear: 11:48 Z (4,55)
  • Gear rotation: 2nd gear: 16:42 Z (2,63) 3-Gang, 14:44 Z (3,14) 4-Gang
  • Transmission: 3rd gear: 21:37 Z (1,76) 3-Gang, 16:37 (2,31) 4-Gang
  • Transmission: 4th gear: 19:34 Z (1,79)
  • Gear rotation: Total: im 3. Gang: 5,65, im 4. Gang: 5,75
  • Transmission: Primary: 14:45 Z (3,21)

Engine - Ignition

  • Ignition type: Interruptor ignition
  • Ignition timing: 24 °
  • Battery voltage: 6 V
  • Charging power (ignition): 33 W
  • Spark plug type: NGK B7ES Bosch W5CC
  • Spark plug thread: long thread

Chassis - tires and rims

  • Front tyre(s): 3.00x10
  • Front rim(s): 2.10x10
  • Rear tyre(s): 3.00x10
  • Rear rim(s): 2.10x10
  • Front tyre pressure: 1,3
  • Rear tyre pressure: 2,0-2,4

Chassis - Brakes

  • Brake system: Drum Brake
  • Front brake: Ø inside 150 mm lining width: 22 mm
  • Front brake operation: mechanical with Cable
  • Rear brake: Ø inside 150 mm lining width: 22 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 33W, swing light magneto ignition
  • Headlights: 6V 25/25W BA20d
  • Parking light: 6V 5W Festoon Bulb
  • Taillights: 6V 3W BAY15d
  • Brake lights: 6V 15W BAY15d
  • Horn: 6V AC

Operating materials

  • Fuel tank capacity: 6.2 l
  • Included reserve: 1 l
  • Mixing ratio: 1:50
  • Range (approx.): 310 km
  • Gearbox oil: SAE 80
  • Amount of gearbox oil: 0.5 l
  • Fuel consumption: 2 l/100km

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