The Series three and all subsequent models were nick named the slim style. This is because compared to the series I and II, the Lambretta had become slimmer and sleeker. The slim style covers all models, LI, TV, SX, GP.
Date of production Dec 1961~Nov 1967- jan 1962~May 1967
Scooters produced 146.000 – 143.091
Capacity 123 cc – 148 cc
Bore x stroke 52 x 58 / 57 x 58 (mm))
Carburettor Dellorto SH 18
Gear 4 speeds Hand controlled
Power 5,5 cv a 5.200 g/m- 6,6 cv a 5.300 g/m
Speed max 70-72 – 80-82 (Km/h)
Tyre Size 3,50×10
Brakes alluminium finned drum
Tank capacity 8.7 L
Consumption 48 – 42 (Km/L)
Weight 105 Kg
Overall length 1825 mm
Overall eight 1035 mm
Overall width 700 mm
Price 134.000 – 159.000 (Lire)
Version I 1962 LI II-type footboard tunnel (width between the two decending sides: 120mm), side-panel anti-vibration buffers without springs, speedometer cable with small, square dial (LI 2-type). Electrical system with battery (150 only) and single wire to the off switch (125 only).
Version II end 1962 – mid-1965 Larger footboard tunnel (width between the two descending sides: 120mm), side-panel anti-vibration buffers without springs, speedometer cable with large dial, electrical system without battery and with two cylinders unified, side-panel anti-vibration buffers fitted with small metal springs (from mid-1964).
Version III mid-1965 – May 1967 Chromed ring between handlebar and leg-shield eliminated, side-panel clamps simplified, now without cog (from Jan. 1966).
Version IV September 1967 – November 1967 (125 only) Frame with LI 4 prefix, side-panels with no aluminium handles, rectangular front badge, “Lambretta Innocenti” rear script, different colour scheme (see below).
Frame numbers by year
LI 125 III
1961: 001001 – 004126
1962: 004127 – 052478
1963: 052479 – 102944
1964: 102945 – 128292
1965: 128293 – 144245
1966: 144246 – 146268
1967: 146269 – 149473
LI 150 III
1962: 600001 – 648718
1963: 648719 – 696740
1964: 696741 – 714020
1965: 714021 – 731136
1966: 731137 – 742068
1967: 742069 – 742982
Colour schemes 150 LI
Body colour parts Fork, frame, leg-shield, fuel tank, handlebar and headset, front mudguard, rear mudguard, floorboard tunnel, wheel hubs, front brake shoe backing plate, wheel rims, saddle frames and large central springs, spare wheel holder, cylinder head air intake manifold (2 pieces), glovebox and lid, tail-light body, fuel tap hatch, stand, stand mudguard, right hand rear floorboard L-bracket, battery holder strap, air box, filter carrier and air intake beneath saddle fuel tank support strap (from 1963). The headlamp cowling, the horn grille and the side-panels are painted in the following colour variants: New Blue, Nile Green, Ruby Red.
Colour schemes 125 LI
Body colour parts Fork, frame, leg-shield, side-panels, headlamp cowl and horn grille, handlebar lever carriers, fuel tank, front mudguard, rear mudguard, floorboard tunnel, wheel hubs, front brake shoe backing plate, wheel rims, saddle frames and large central springs, spare wheel holder, cylinder head air intake manifold (2 pieces), glovebox and lid, tail-light body, fuel tap hatch, stand, stand mudguard, right-hand rear floorboard L-bracket, air box, filter carrier and air intake beneath saddle fuel tank support strap (from 1963).
Version IV LI 4 only The glovebox, fuel tank, cylinder head air intake manifold (2 pieces), headlamp cowling, front mudguard, rear mudguard, the air box and filter carrier and fuel tank support straps are painted in New White.
Finishes 125-150 LI
Black finish Rear damper.
Crankcase Bare aluminium.
Carburettor Carburettor body and float chamber cover bare aluminium, zinc-plated screws and fittings.
Control cable sheaths Grey.
Saddles Black imitation leather with “Innocenti” rear script.
Chromed parts LI 125-150
Frame Brake pedal, frame tube cable clip, “Lambretta 175 TV” script on leg-shield, ring beneath steering head, threaded kick-start lever bush.
Electrical parts Headlamp bezel, right-hand light switch screws, ignition lock bezel and cover.
Engine Kick-start lever.
Zinc plated parts 125-150
Front fork Screws and pins, lower steering head bearing dust cap, wheel carriers.
Frame All screws and bolts, special washers, bushes. Side-panel internal catches, side-panel locking plates.
Electrical parts Rectifier box (150 LI).
Engine Levers, studs, screws and nuts, oil caps, lubricators.
Wheels Plain and cap nuts, bushes, wheel hub brake levers.
Polished parts 125-150 LI
Engine Air filter pipe fixing spring (version III only).
Frame Plates and shaped bar for side-panel catches, stand spring, brake pedal spring, fuel tank support straps (1962 only).
Frame Fuel tap and choke levers, side-panel levers, handlebar levers, Lambretta script on side-panels, floorboard runners and ferrules, leg shield profile terminals, edges of rear badge mount, glovebox lock lever. 150 LI only: Handlebar lever carriers.
Electrical parts Handlebar Off switch, light switch cover
Lechler system colours 125-150 LI
Iseo Blue 8035
Beige Not available
Aquamarine blue 8030 (LI 4 only)
New White 8059 (internal parts LI 4 only)
Grey 8068 (earliest examples only
New White 8059
For the side-panels, the headlamp cowling and the horn grille:
New Blue 8038
Nile Green 8015
Ruby Red 8047
Maintenance data 125-150 LI
Fuel/oil mixture 2%
Spark plug Bosch 225/240 long thread
Engine oil SAE 90, 600cc
Carburettor (125 LI) Dell’Orto SH 1/18
max jet 98, min 42 Valve 1
Carburettor (150 LI) Dell’Orto SH 1/18
max jet 105, min 45 Valve 1
Ignition advance 22°-24° 32-33 mm on flywheel circumference