LAMBRETTA LUI 75 S / SL 75 ccm 2T AC '68-'70

Photo from LAMBRETTA LUI 75 S / SL 75 ccm 2T AC '68-'70 | LAMBRETTA

Overview Lambretta Lui 75

A few months after the launch of the Lambretta Lui 50, Innocenti presented the Lui 75 at the 15th Engine Show in Tokyo at the end of October 1968, which was available in two variants: 75 S and 75 SL. For the Italian market, all models bore the name "Lui", while abroad the 75 S was marketed as "Vega" and the 75 SL as "Cometa", presumably as an allusion to the "Space Age" era of the late 1960s.

Lambretta Lui 75 model history

The main difference between the 75 S and the 75 SL was the "Lubematic", a separate lubrication system that was inserted as standard for the first time on an Italian scooter. The most obvious difference between the two models was the Lubematic Sticker on the Tank and the corresponding Badge on the Legshield. Compared to the 50 cc variants, the 75 cc models had an improved electrical system that fed both the high beam and the rear Brake Light. Similar to the 50 S Models, the 75cc models were also equipped with a double seat and the Up-And-Over Exhaust.
The frame consisted of a tubular steel front section with bolt-on Legshields and a pressed steel monocoque frame at the rear. The front section consisted of a traditional tubular frame, while the rear section was moulded. The suspension comes from the Junior series. The Brake Drum is made entirely of steel for solid road grip. The mechanical concept was also taken from the Junior series.

  • Lui 75 S, SL - First edition (from March 1968 to early 1969)
    The Lambretta Badge was located on the left-hand side of the Legshield, above the 50 C or CL models. The levers for the brake and Clutch ended without a ball shape, and a chrome-plated Grill adorned the area behind the front headlight.

  • Lui 75 S, SL - Second edition (from early 1969 to December 1970)
    The Lambretta Badge was no longer to be found on the Legshield. Instead, a rectangular Lui logo was emblazoned in the centre of the Legshield. The brake and Clutch levers were now fitted with Ball ends, and the chrome-plated Grill behind the front headlight bore the Innocenti lettering. A small Innocenti logo was also found above the Lui Emblem on some models.

The Engine of the Lambretta Lui 75

The Engine achieves an output of 5 hp and, thanks to the four-speed gearbox, enables considerable acceleration up to a maximum speed of 82.5 km/h. This raises the question of what exactly the bottleneck is with the Lui 50 C/CL models, which are limited to speeds below 40 km/h despite having only 25 cc less displacement.

Situation on the used Lambretta Lui 75 market

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The colours of the Lambretta Lui 75:

Colour

Colour name

Colour code

Colour info

Grigio Metalizzato

8060

Giallo Ocra

8080

General Information

  • Producer LAMBRETTA
  • Model LUI 75 S / SL
  • Displacement 75 ccm
  • Cycles and cooling 2T / AC
  • Year of construction `68-`70
  • Built quantity 9403
  • 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
  • Length: 1700 mm
  • Width: 656 mm
  • Height: 1028 mm
  • Seat height: 770 mm
  • Wheelbase: 1202 mm
  • Weight (empty): 77 kg
  • Turning circle: 3300 mm
  • Performance (PS): 5 PS
  • Performance (kW): 3.68 kW
  • at rpm: 6300
  • Top speed: 82.5 km/h
  • Engine type: 2-stroke internal combustion engine
  • Engine manufacturer: Innocenti
  • Engine number: 75S
  • position of engine number: right-hand side Engine in the switching scale area

Engine - cylinders, clutch & exhaust

  • Displacement: 74.4 ccm
  • Bore: 46.4 mm
  • Stroke: 44 mm
  • Number of cylinders: 1
  • Transfer ports: 2
  • Type of cooling: Air
  • Compression: 9,3:1
  • Starter: Kickstarter
  • Clutch: Multi-disc clutch in oil bath on Input Shaft

Engine - Carburetor

  • Mixture preparation: Carburetor
  • Type of carburetor: Dell'Orto SH 1/20
  • Main jet: 68
  • Idle jet: 45

Engine - Transmission

  • Type of gearbox: Manual gearstick
  • Number of gears: 4
  • Gear rotation: 1st gear: 9:49 Z (5,44)
  • Gear rotation: 2nd gear: 13:46 Z (3,54)
  • Transmission: 3rd gear: 16:42 Z (2,63)
  • Transmission: 4th gear: 20:39 Z (1,95)
  • Gear rotation: Total: im 4. Gang: 6,90
  • Transmission: Primary: 13:46 Z (3,54)

Engine - Ignition

  • Ignition type: Interruptor ignition
  • Ignition timing: 21 °
  • 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: 1,5
  • Rear tyre pressure: 1,75

Chassis - Brakes

  • Brake system: Drum Brake
  • Front brake: Ø inside 125 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: Springs inside
  • Rear suspension: Shock Absorber L 295 mm

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 l
  • Included reserve: 0.8 l
  • Mixing ratio: 1:50
  • Range (approx.): 300 km
  • Gearbox oil: SAE 90
  • Amount of gearbox oil: 0.6 l
  • Fuel consumption: 2 l/100km

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