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Lambretta (Innocenti) J 100 (Cento)

Lambretta (Innocenti) J 100 (Cento)


Lambretta Junior

In 1964 Innocenti introduced a whole new scooter family with the Junior range. The simple and lightweight construction of the scooters should allow for lower prices and therefore appeal to new groups of customers.

The construction bears some similarities to Piaggio scooters by using a monocoque chassis. Also the access to the carburettor under a small plastic toolbox under the seat is similar to the smallframe Vespas. The engine however is placed centrally in the chassis and constructed along the lines of the larger LI series, even if the cylinder sits upright instead of lying horizontally. Depending on the model, a dual seat, a single seat or two single seats were fitted.

The engine is covered by side panels, which had external handles on most models. Most rubber parts were coloured grey, apart from the kickstart rubber and the stand feet, which came in black colour.


The Cento (Italian for 100) was the first model of the Junior range and was flawed by the unusual capacity, even if market research had predicted that 100cc would be the ideal engine size. It was therefore soon accompanied by a 125cc version simply called J 125. Both models had a dual seat, three-speed gearbox and 3.00 10 wheels. The Cento had a power output of 4.7 hp and nearly reached 80 kph, while the J 125 broke this barrier with its 5.8 hp.

Production numbers were 17.643 for the Cento until November 1965, and 21.651 for the J 125 until October 1966.

Production period:
Production code:
1st frame no.:
100 cc


(March 1964 until November 1965)

No major changes during the production run. From December 1964 rectangular instead of round steering lock base.


Original paint (Lechler)

Avorio Chiaro
Vehicle (general)
name: J 100 (Cento)
year of manufacture: 1964, 1965
VIN: 100LB
no. of exemplars produced: 17642
colours: avorio chiaro (8054)
Vehicle sizes
length: 1690 mm
width: 630 mm
height: 1020 mm
seat height: 770 mm
wheelbase: 1190 mm
petrol tank capacity: 6.2 l
tank reserve (petrol): 1 l
weight (dry): 90 kg
weight (max): 230 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: 150 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 with separate reservoir
Vehicle engine
displacement: 98 cm³
stroke: 48 mm
bore: 51 mm
engine type: 2-stroke
number of cylinders: 1
type of cooling: air
power (kW): 3.46 kW
power (HP): 4.7
rpm (P max): 5300
compression ratio: 1:7.5
mixture preparation: carburettor
carburettor: Dell'Orto SHB 16-18
starter: kickstarter
clutch: manual
engine brand: Innocenti
max speed: 77 km/h
engine type: 2-stroke
emission standard: none
Vehicle engine - ignition
ignition type: point set ignition
advanced ignition: 24
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:: 3.21
ratio speed 1 - 1:: 4.8
ratio speed 2 - 1:: 2.87
ratio speed 3 - 1:: 1.86
overall ratio - 1:: 5.97
Fahrzeug Betriebsstoffe
fuel: Super (ROZ 95)
mix ratio: 1:50
gearbox oil: SAE80
gearbox oil capacity: 0.5 l
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