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Lambretta (Innocenti) Lui 75 (75 S, 75 SL, Vega, Cometa)

Lambretta (Innocenti) Lui 75 (75 S, 75 SL, Vega, Cometa)


Lambretta Lui
(like Luna, Vega & Cometa)

The Lui (also called Vega in some export markets) was designed to secure the market share in the 50cc class, after the J-range only achieved disappointing sales figures. To keep the production cost down, the scooter's equipment was reduced to the necessary minimum. In order to avoid a cheap appearance, Nuccio Bertone, a renowned vehicle designer was given the task of creating a suitable livery for the lightweight model. Indeed his design for Lui and Vega was a futuristic masterpiece which looks just as up-to-date today as in 1968, when the slogan “All for Lui and Lui for all” was created.

The frame consists of a front and a rear piece. While the front is made from conventional tubular steel, the rear is a pressed steel item. The suspension was adapted from the J-range, while the brake drums were made entirely from steel. Most of the mechanical system was taken over from the J.

Lui 75 S & SL

Only a few months after the launch of the Lui 50, Innocenti presented the Lui 75 at the 15th Tokyo Motor Show, being the only European exhibitor present. The Lui 75, also dubbed Vega, was available in two versions: S and SL. Compared to the 50cc models, the 75 had a upgraded electric system to power high beam and brake light. Similar to the 50 S both 75 versions had a dual seat and a motocross-style up-and- over exhaust. The engine's power output was 5,2 hp, giving a rather quick acceleration thanks to the 4-speed gearbox.

The main difference between the S and the SL however is the autolube system called “Lubematic”. It was the first autolube system fitted to a mass-production Italian scooter.

Both versions were only available in two colour schemes: Ochre and metallic grey. The main visible difference between the two is a Lubematic sticker at the legshiels of the SL.

Production period:
Production code:
1st frame no.:
Lui 75
75 cc


Lui 75 S, SL – 1st version
(March 1968 until beginning of 1969)

Lambretta badge at the left of the legshields over the 50 C or CL badge, no ball-ends at the levers, chromed grille behind the headlight.


Lui 75 S, SL – 2nd version
(beginning of 1969 until December 1970)

No Lambretta badge at the legshields, ball-end brake and clutch levers, chromed grille behind the headlight with Innocenti label. Few scooters have an additional little Innocenti badge over the Lui badge.


Original paint (Lechler)

Grigio Met. (Silber)
Giallo Ocra (Ocker)
Vehicle (general)
name: Lui 75 (75 S, 75 SL, Vega, Cometa)
year of manufacture: 1968, 1969, 1970
VIN: 20/8
no. of exemplars produced: 9402
colours: ocra (8080)
Vehicle sizes
length: 1700 mm
width: 656 mm
height: 1028 mm
seat height: 770 mm
wheelbase: 1202 mm
petrol tank capacity: 6 l
tank reserve (petrol): 0.8 l
weight (dry): 76 kg
Vehicle wheels
front tyre: 3.00 - 10
rear tyre: 3.00 - 10
front wheel rim: 2.10 - 10
rear wheel rim: 2.10 - 10
Vehicle brakes
front brake type: drum brake
front brake operation: mechanical with cable
Ø front: 125 mm
rear brake type: drum brake
rear brake operation: mechanical with cable
Ø rear: 150 mm
Vehicle suspension
front suspension type: spring only, trailing link fork
rear suspension type: shock absorber
Vehicle engine
displacement: 74.4 cm³
stroke: 44 mm
bore: 46.4 mm
engine type: 2-stroke
number of cylinders: 1
type of cooling: air
power (kW): 3.68 kW
power (HP): 5
rpm (P max): 6300
compression ratio: 1:9.3
mixture preparation: carburettor
carburettor: Dell'Orto SH1/20
starter: kickstarter
clutch: manual
engine brand: Innocenti
max speed: 82.5 km/h
engine type: 2-stroke
emission standard: none
Vehicle engine - ignition
ignition type: point set ignition
advanced ignition: 21
points distance: 0.4 mm
power (light): 33 W
voltage: 6 V
spark plug: (NGK) B7ES
Vehicle engine - gearbox
gear change type: manual
no. of gears: 3
ratio primary - 1:: 3.538
ratio speed 1 - 1:: 5.44
ratio speed 2 - 1:: 3.538
ratio speed 3 - 1:: 2.625
ratio speed 4 - 1:: 1.95
overall ratio - 1:: 6.9
Fahrzeug Betriebsstoffe
fuel: Super (ROZ 95)
mix ratio: 1:50
gearbox oil: SAE80
gearbox oil capacity: 0.5 l
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