B 125

1948 Lambretta scooter 125 B

Model B is a follow up to the Model M (A) the main change was the gear wich is hand controlled on this version, a feature to stay with all models ever produced.



Date of production Nov 1948~Jan 1950
Scooters produced 35.014
Capacity 125 cc
Bore x stroke 52×58 mm
Carburettor Dellorto MA 16
Gear 3 speeds Hand Controlled Teleflex
Power 4.1 cv a 4.500 rev/min
Speed max 65-70 Km/h)
Tyre Size 3,50×8
Brakes Drum brakes with steel shoes
Tank capacity 6L, reserve 0,8L
Consumption 30 Km/L
Weight 60 Kg
Overall length 1620 mm
Overall eight 880mm
Overall width 650mm handlebar
Price 170.000 Lire
Aditional info Air Cooled, Rear seat and foot rest optional

Identification details

up to approx. frame number 20.000 Heel-actuated brake pedal, internal clutch control, light switch on lamp fairing ( moved to the right-hand lever mount on the last 2000 version I examples), cylindrical rubber stops between tank and toolbox, kick-start lever with vertical spline.

up to approx. frame number 40.000 Toe-actuated brake pedal, external clutch control, light switch on the right-hand lever mount (the first 5000 version II examples still had the earth switch on the frame), tank-glovebox rubber stops eliminated, kick-start lever with horizontal spline.

up to the end of production Internal rear suspension leverage increased and fixed with screws, glovebox lid support buffers eliminated.

Frame numbers by year

Model B

1948: 000001 – 001855

1949: 001856 – 033176

1950: 033177 – 035014

Colour schemes and finishes

Body colour parts Fork, steeringhead cover and side plates, frame, running boards, tank, toolbox and lid, front and rear lamp housings, passenger footrest, 2-piece rear mudguard.
Fiat 690 aluminium paint Steeringhead with the two fork support arms, wheel hubs, wheel rims, front brake shoe backing plate, tank/saddle cross member. Front and rear saddle frames, stand, bronze support between glovebox and engine.
Crankcase and flywheel cover Aluminium paint.
Carburettor Body and filter aluminium paint, details and screws in chromed Zama.
Control cable sheaths Silver grey.
Saddle Dark brown imitation leather with rear script “continentale produzione selle Aquila”, real leather available on request.
Exhaust finish Chromed manifold, matte nickel-plated silencer.
Handlebar gearshift Grip with 1-2-3 script and its handlebar support in aluminium paint; 1-2-3 numbers in red; nickel-plated fixing screws, adjustment nuts and Tekefkex sheath trunnion

Chromed parts

Frame/body Handlebar, front brake and clutch lever mounts, front fork nuts, floorboard runners and ferrules, rear brake pedal, rear frame tubes, toolbox lid frame and hinge, rear saddlees horizontal spring, tie-rod, nut spring cap and tie rod crosspiece. Front saddle L-brackets and bolts (version I only). Lambretta script on glovebox (the insides of the letter A, B, E, and A and the line below the script are painted black.
Electrical parts Headlamp bezel, light switch cover (versions II and III only).
Engine Kick-start pedal, oil filler caps, rear suspension linkage and rear brake lever (versionI only), fuel tap (versions II and III only).
Wheels Large and small cap nuts, front hub brake lever.

Nickel-plated parts

Front fork Internal pivots.
Frame/body Bodywork screws and bolts, front saddle support, L-brackets and bolts (versions II and III only).
Engine Rear shock absorber bump-stop cap, complete Teleflex cable sheath. Rear suspension rlrmrnyd (versions II and III only), oil filler caps, rear brake lever and clutch lever (versions II and III only), fuel tap (version I only).
Wheels Front wheel hub bushes and nuts.

Polished parts

Frame/body Handlebar lever, headlamp support, glovebox closure, horn grille.

Maintenance data

Fuel/oil mixture 5%
Spark plug Bosch 225 short thread
Engine oil SAE 15/50, 180g
Final drive grease
Carburettor MA 16, max jet 65, min 45, valve 55
Ignition advance 26°, 33mm on the flywheel circumference

Lechler system colours

Metallic blue 8024
Metallic red 8023
Metallic green 8025
Metallic bronze 8053
Aluminium (engine and frame) Fiat 690