1951 Lambretta scooter MK D

This was the first Model that was made out side of Italy as Innocenti sold license for production around the world.



Date of production Dec. 1951 – Nov. 1958 – Oct. 1954 – Dec. 1956
Scooters produced 135.482 – 54.593
Capacity 125 cc – 148 cc
Bore x stroke 52×58 – 57×58 (mm)
Carburettor Dellorto MU 18 B2/MU 18 B3 – MA 19 B4
Gear 4 speeds Hand controlled Teleflex – Hand controlled by two cables
Power 5 cv a 4,600 rev/min – 6 cv a 4.750 rev/min
Speed max 70-75 km/h – 75-80 km/h
Tyre Size 4×8
Brakes alluminium finned drum
Tank capacity 6 L Reserve 0.7 L – 6.3 L Reserve 0.7 L
Consumption 50 Km/L
Weight 70 Kg – 75 Kg
Overall length 1770 mm
Overall eight 960 mm
Overall width 760 mm, handlebar – 740 mm, handlebar
Price 135.000 Lire – 134.000 / L. 129.000 Lire

Identification details

Version I 1951-1952 Handlebar in chromed steel with aluminium end caps, small pedal (modified from mid-1952 with cable operation and larger pedal), saddle frame with 25 C-type conical tool carrier tube (modified from mid-1952 with new saddle frame with cylindrical tool carrier tube and cap closed with a clip), black 2-position light switch with chrome cover, horn with “flower” grille. Smooth fork cover (from mid-1952 with and indent to contain the larger bushes). Engine mounted on plain bearings (Silent Blocs from mid-1952).
Earliest examples of the 125 D: rear toolbox with small 125 C-type clasps. A second porthole on the engine cover close to the torsion bar mount that was intended to permit the fitting of a return damper never actually adopted.
Version II 1953 Adjustable handlebar in aluminium with plastic levers, front brake enlarged to 125 mm, passenger grab-handle incorporated in rear saddle, 2-position light switch in ivory-colour plastic, horn with traditional grille (from around February 1953). Toolbox lid lock with cover
Version III 1945 Cable adjusters on the clutch and front brake levers, dark green saddle covers, front position light and 3-position white light switcg with chrome cover (from mid-1954), grips with hand-shields.
Final batch 1955 Handlebar in chrome-plated steel (still adjustable and with plastic levers), lubricator on the fron fork stems.
Final examples Provision for a rear damper on the transmission housing.

Frame numbers by year

D 125 MK I

1951: 000001 – 003865
1952: 003866 – 068543
1953: 068544 – 069000

D 125 MK II

1953: 069001 – 091566
1954: 122032 – 122641
1954: 091567 – 122030

D 150 MK II

1955: 005001 – 038758

D 125 MK III

1955: 122642 – 122992
1956: 122993 – 123142


1957: 038759 – 059593

Colour schemes and finishes 125D

Body colou parts Fork, fork covers, frame, leg-shield, fuel tank, toolbox and cover 2 glovebox cross-members, headlamp, front and rear mudguards, steeringhead badge mount.
Aluminium paint Wheel hubs, wheel rims, front brake shoe backing plate, front and rear saddle frames (including all large and small springs), stand, 2 underfloor cross-members, spare wheel holder, license plate holder and its tool tube strut and cover, torision bar lever.
Crankcase and flywheel cover Aluminium paint.
Carburettor Air filter painted aluminium silver, burnished body, nickelplated screws and fittings, bare aluminium cover and “tickler”.
Control cable sheaths Grey, nickel-plated Teleflex sheath (cadmium-plated from mid-1954).
Saddles mid-brown, coarse grain imitation leather, “Aquila Continentale” rear script. The rear saddle may be either triangular or rectangular (1951-52 only). From 1954, dark green, fine grain imitation leather with :Innocenti” rear script.
Silencer Matte black.

Chromed parts

Frame Handlebar (if in steel) and its details, brake pedal. Bolts on central handlebar mount (1953-1954). Passenger’s footrest support rod and steeringhead cable clip. Rear glovebox lock cover (1953-1954 only).
Electrical parts Headlamp and tail lamp surrounds, horn grille, light switch cover (from 1954).
Engine Kick-start pedal.
Wheels Large cap nuts.

Nickel-plated parts (until mid-’54) – cadium-plated parts (from mid-’54)

Front fork Front wheel carriers, screws and pins.
Frame All screws and bolts, lubricators, steeringhead lower bearing cap, torision bar figure-of-eight clip, special washers, bushes.
Electrical parts Horn stem and clip, light switch cover screws.
Engine Levers, studs, screws, oil plugs, engine bearing (model with silent Blocs), engine bearing dust caps (model with plain bearings). Complete Teleflex sheath.
Wheels Small cap nuts, bushes, wheel hub brake levers.
Attention! Note: Towards mid-1954 cadium plating (similar to white zinc) was introduced in place of nickel plating. This new treatment was adopted once the stockof nickel-plated material was exhausted; it is therefore possible to find 1954 Lambrettas with both nickel- and cadmium-plated parts.

Burnished parts

Engine Large and small Allen bolts.

Polished parts

Frame Handlebar levers and grip caps (1951-1952 only). Side-panel levers (LDonly). Handlebar, central clamp and lever carriers (1953-1954) Floorboard runners.

Lechler system colours

Olive green 8021
Light chamois 8055
Sand beige 8029
Aluminium (engine and frame) Fiat 690

Maintenance data

Fuel/oil mixture 5%
Spark plug Bosch 225 short thread
Engine oil SAE 15/50, 400g
Final drive SAE 140 100g
Carburettor Dell’Orto MA 18B2
max jet 75, min 40
Carburettor Dell’Orto MA18B3
max jet 70, min 45
Valve 75
Carburettor Zenith 18, max jet 102
Marelli ignition advance 34-39.5mm on flywheel circumference
Filso ignition advance 32-34mm on flywheel circumference