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Lambretta (Innocenti) J 50
Description
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.
J50
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 Also, 3.00-10 wheels superseded the original 2.75 9 sized wheels of the previous versions.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.
| Model: Capacity: Production period: Quantity: Production code: 1st frame no.: |
J50 50 cc 10/64-11/65 69.988 - 400.001 |
J50 – 1st version
(1964)
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)
| J50: | |
| Bianco Nuovo 8059 |
 |
| Verde Mela 8039 |
 |
| Azzurro Acquamarina 8030 |
 |
| Viola Palido 8069 |
 |
| Rosso Rubino 8047 |
 |
2 tone models: |
|
| Verde Oliva Chiaro 8079 |
 |
| Verde Oliva Scuro 8078 |
 |
J50 Deluxe: |
|
| Bianco Nuovo 8059 |
|
| Verde Mela 8039 |
|
| Azzurro Acquamarina 8030 |
|
J50 Special: |
|
| Turchese 8016 |
 |
| Rosso 8073 |
 |
| Giallo Ocra 8080 |
 |
| 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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