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Lambretta (Innocenti) B 125
Description
Lambretta B 125
After the success of the model A, Innocenti quickly decided to develop an improved version. This is very much a natural progression of the model A, although the improvements are far from being only superficial. The model B boasts a number of significant technical improvements. The most important is the rear suspension, which gives a much more pleasant ride, especially in conjunction with the larger 8 inch wheels. The scooter is much more stable and also more comfortable due to a revised seating position.
The gearchange was moved from the floorboard to the handlebars and was now controlled by the patented Teleflex cable. The solution with a hand-operated twistgrip- gearchange was continued throughout the production of all subsequent Lambrettas. The other cables are now routed alongside the frame, which greatly enhances servicing. The capacity of the petrol tank was enlarged, too. As with the model A, there are a number of changes during the production run of the model B. For instance, the brakes were improved with the final models, as the pads are no longer liners inside the drum, but mounted to the shoes. Change of brake shoes becomes much easier this way. After
35.014 scooters made, production of the model B ceased in January 1950. All B models were painted in metallic colours.
| Model: Capacity: Production period: Quantity: Production code: 1st frame no.: |
125 B 125 cc 11/48-01/50 35.014 - 00001 |
125 B – 1st version
(up to frame no. 20.000)
Heel-operated brake pedal, internal routed clutch cable, light switch on the headlight (moved to the righthand handlebars for the final 2.000 scooters of the first version), rubbers between tank and toolbox, kickstart with vertical bolt.
125 B – 2nd version
(up to frame no. 40.000)
Brake pedal at the front of the floorboards, externally routed clutch cable, no rubbers between tank and toolbox, kickstart with horizontal pin.
125 B – 3rd version
(up to end of production)
The seating of the rear spring is enlarged in diameter and held by screws. The two large rubber buffers under the toolbox rail disappear.
Original paint (Lechler)
| Rosso Met. 8023 |
 |
| Azzurro Met. 8024 |
 |
| Verde Met. 8025 |
 |
| Bronzo Met. 8053 |
 |
| Vehicle (general) | |
|---|---|
| name: | B 125 |
| year of manufacture: | 1948, 1949, 1950 |
| VIN: | 125B |
| no. of exemplars produced: | 35014 |
| colours: | azurro met (8024), camoscio met (8053), rosso met (8023), verde met (8025) |
| Vehicle sizes | |
| length: | 1680 mm |
| width: | 900 mm |
| height: | 900 mm |
| ground clearance: | 120 mm |
| wheelbase: | 1250 mm |
| petrol tank capacity: | 6.8 l |
| tank reserve (petrol): | 0.8 l |
| weight (dry): | 71 kg |
| Vehicle wheels | |
| front tyre: | 3.50 - 8 |
| rear tyre: | 3.50 - 8 |
| front wheel rim: | 2.50 - 8 |
| rear wheel rim: | 2.50 - 8 |
| Vehicle brakes | |
| front brake type: | drum brake |
| front brake operation: | mechanical with cable |
| Ø front: | 100 mm |
| rear brake type: | drum brake |
| rear brake operation: | mechanical with cable |
| Ø rear: | 140 mm |
| Vehicle suspension | |
| front suspension type: | spring only |
| rear suspension type: | only spring |
| Vehicle engine | |
| displacement: | 123 cm³ |
| stroke: | 58 mm |
| bore: | 52 mm |
| engine type: | 2-stroke |
| number of cylinders: | 1 |
| type of cooling: | air |
| power (kW): | 3.09 kW |
| power (HP): | 4.2 |
| rpm (P max): | 4400 |
| compression ratio: | 1:6 |
| mixture preparation: | carburettor |
| carburettor: | Dell'Orto MA16 |
| starter: | kickstarter |
| clutch: | manual |
| engine brand: | Innocenti |
| max speed: | 68 km/h |
| engine type: | 2-stroke |
| emission standard: | none |
| Vehicle engine - ignition | |
| ignition type: | point set ignition |
| advanced ignition: | 27 |
| points distance: | 0.45 mm |
| power (light): | 30 W |
| voltage: | 6 V |
| spark plug: | (NGK) B8HS |
| Vehicle engine - gearbox | |
| gear change type: | manual |
| no. of gears: | 3 |
| ratio speed 1 - 1:: | 9.25 |
| ratio speed 2 - 1:: | 6.38 |
| ratio speed 3 - 1:: | 4.35 |
| Fahrzeug Betriebsstoffe | |
| fuel: | Super (ROZ 95) |
| mix ratio: | 1:25 |
| gearbox oil: | SAE50 |
| gearbox oil capacity: | 0.5 l |
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