1951 Lambretta scooter MK LD

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



Date of production Jun 1951~Nov 1956 – Nov 1954~Jan 1957
Scooters produced 131.665 – 8.694* – 110.186 – 2.020*
Capacity 125 cc – 148 cc
Bore x stroke 52×58 – 57 x 58 (mm)
Carburettor Dellorto MA 19 B4
Gear 4 speeds Hand controlled Teleflex – Hand controlled
Power 3.8 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 6.3 L Reserve 0.7L – 6.8 L Reserve 0.8 L
Consumption 50 Km/L
Weight 85 – 88* – 88 – 94* (Kg)
Overall length 1770 mm
Overall eight 960 mm
Overall width 740 mm, handlebar
Price 158.000 – 152.000* – 164.000 – 179.000* Lire
Battery* 6 volt – 12 volt

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). Side covers with portholes with chrome rings, “Lambretta” script in aluminium on the leg-shield and the “Innocenti” badge above the headlamp.
Earliest examples of the 125 LD: 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). Side panels with plastic air vent grilles (version I panels were fitted to the earliest examoples of the ’53 LD), plastic “LD shield badge on the leg-shield.

Version III 1945 Cable adjusters on the clutch and front brake levers, dark green saddle covers, front position light and 3-position white light switch with chrome cover (from mid-1954), grips with hand-shields. New, larger saddles closed at the front introduced around mid-1954, fitted with dark green covers and bi-conical rather than conical springs; in this case the tool carrier tube was replaced with a triangular toolbox mounted on the rear mudguard. Rubber handlebar control cable sheaths introduced towards the end of 1954.

Final batch 1955 Handlebar in chrome-plated steel (still adjustable and with plastic levers), lubricator on the fron fork stems. Larger 150 D-type carburettor air filter.

Final examples Provision for a rear damper on the transmission housing.

Frame numbers by year

LD 125 MK I

1951: 000001 – 000137
1952: 000138 – 029610
1953: 029611 – 053197

LD 125 MK II

1953: 053198 – 075405
1954: 075406 – 117027
1954: 117028 – 117501
1955: 117502 – 119564
1956:119565 -140366

LD 150 MK II

1954: 105001 – 105442
1955: 105443 – 157721
1956: 157301 – 209890


1957: 500001 – 530792
1958: 530793 – 543687

LD 150 MK III 1957: 200001 – 281871
1958: 281872 – 313853

Colour scheme and finishes

Body colour parts Fork, fork covers, frame, leg-shields, headlamp surround, side panels, passenger running boards, front mudguard.
Aluminium paint Wheel hubs, wheel rims, front brake shoe backing plate, front and rear saddle frames (including the large and small springs; in some cases the large springs are chromed), stand, spare wheel holder, license-plate holder nad supports, tool-carrier tube and its cover, torsion bar lever.
Grey primer paint Fuel tank, rear mudguard
Crankcase Aluminium paint.
Intake manifold (in sheet aluminium) Clean, semi-gloss (neither polished nor painted).
Carburettor Air filter painted aluminium silver, burnished body, nickel-plated screws and fittings, bare aluminium cover with “tickler.
Control cable sheaths Grey.
Saddles Mid-brown, coarse grain imitation leather with “Aquila Continantale” rear script. The rear saddle may be either triangular or rectangular (1951-52 only). From 1954, dark green, fine grain imitation leather wiyh “Innocenti” rear script.
Silencer Matte blakc.

Chromed parts

Frame Handlebar (if in steel) and its details, brake pedal. Bolts on central handlebar mount (1953-1954).Steeringhead upper bearing support plate, floorboard runners and fittings. closed-front saddles.
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 cariers, screws and pins.
Frame All screws and bolts, lubricators, steeringhead lower bearing cap, torision bar figure-of-eight clip, special washers, bushes.
Electrical parts 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