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Lambretta (Innocenti) J 50

Lambretta (Innocenti) J 50


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.


There are four different versions of the J 50. The first series featured 50cc capacity

and a three-speed gearbox, which resulted in the enormous power output of 1,47 hp and a breathtaking top speed of 40 kph. A dual seat came as standard, but speedo and steering lock were omitted for financial reasons. The second version received a restyled bodywork with narrower legshields and a newly designed seat base. In 1966 the so-called “DeLuxe” version hit the shops, bearing polished aluminium flashes on the side panels, a new single seat together with a carrier plate on the back and clipped side panel hooks instead of handles. Also, 3.00-10 wheels superseded the original 2.75 9 sized wheels of the previous versions. Finally, the “Special” was introduced in 1970, with a floorboard mat instead of ribs, a sporty single seat and a spoiler-like grabrail on the back.

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


J50 – 1st version

9 inch wheels, wide legshields without beading, alloy kickstart, plain frame below the rear light, front forks with screw-in buffers


J50 – 2nd version
(1965 until mid 1966)

9 inch wheels, wide legshields with rubber beading, chromed alloy kickstart, front forks with clip-on buffers, J 50 embossed in frame below rear light.


J50 – 3rd version
(mid of 1966 until 1967)

New frame with narrow legshields, 9 inch wheels, dual seat, J 50 embossed in frame below rear light and re-enforced engine silent blocks. Official production name “Model '66”


J50 – 4. Version
(End of 1967 until beginning of 1968)

Clip-on side panels, 10 inch wheels.


Original paint (Lechler)

Bianco Nuovo
Verde Mela
Azzurro Acquamarina
Viola Palido
Rosso Rubino

2 tone models:
Verde Oliva Chiaro
Verde Oliva Scuro

J50 Deluxe:
Bianco Nuovo
Verde Mela
Azzurro Acquamarina

J50 Special:
Giallo Ocra
Vehicle (general)
name: J 50
year of manufacture: 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971
VIN: J50,50DL
no. of exemplars produced: 112439
colours: azzuro acquamarina (8030), bianco nuovo (8059), turchese (8016), verde mela (8039)
Vehicle sizes
length: 1660 mm
width: 630 mm
height: 1000 mm
seat height: 770 mm
wheelbase: 1190 mm
petrol tank capacity: 6.2 l
tank reserve (petrol): 1 l
weight (dry): 78 kg
weight (max): 150 kg
Vehicle wheels
front tyre: 2.75 - 9, 3.00 - 10
rear tyre: 2.75 - 9, 3.00 - 10
front wheel rim: 1.75 - 9
rear wheel rim: 1.75 - 9
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: 49.8 cm³
stroke: 58 mm
bore: 38 mm
engine type: 2-stroke
number of cylinders: 1
type of cooling: air
power (kW): 1.08 kW
power (HP): 1.47
rpm (P max): 4500
compression ratio: 1:7.75
mixture preparation: carburettor
carburettor: Dell'Orto SHB 18-12
starter: kickstarter
clutch: manual
engine brand: Innocenti
max speed: 38.5 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): 18 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:: 6.9
ratio speed 2 - 1:: 4
ratio speed 3 - 1:: 2.5454
overall ratio - 1:: 8.182
Fahrzeug Betriebsstoffe
fuel: Super (ROZ 95)
mix ratio: 1:50
gearbox oil: SAE80
gearbox oil capacity: 0.5 l
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