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Lambretta (Innocenti) LI 125 (series 3)

Lambretta (Innocenti) LI 125 (series 3)


Lambretta Li 125
Series 3

The 'Slimstyle' Lambretta is the start of the unforeseen success-story of the Lambretta. All subsequent Lambrettas with the large frame trace their origin directly back to the LI Series III. Even the Lambretta Series 4 which is currently in planning stage is based on that frame and seems to have many parts in common with the DL/GP models.

The outer appearance of the Series III changes drastically compared to the Series II to a much more dynamic and streamlined design which is why the Series III is also called “Slimstyle”. Headset, horncasting, mudguard, side-panels, legshields, floorboards and frame are not only much sleeker, there are also significant savings in production materials and weight.

The LI Series III is sold with two single saddles as standard, while a dual seat is available as an option at additional cost. A new feature is the badge holder behind the seat, which replaces the grill of the earlier LI Series and holds a LI 125 or LI 150 badge depending on the model. The speedometer of the 125cc version ends at 80kph, while that of the 150cc tops at 100kph.

The technical details under the panels however had been changed only slightly. A new item is the Dell´Orto SH carburettors with centre float, which replace the old MA/MB card whith their side floats. The altered carb is also the main reason for the reduced consumption figures and increased performance (probably together with the reduced weight and lower wind-resistance). The engine cover is slightly altered to complement the sleeker panels. Also the intake system and the exhaust are altered. At the chassis, the proven system was basically retained, even if every single component was newly designed. For instance, the rear shock absorber of the Series III is slightly shorter than its predecessor.

Due to the long period of production of the Series III, many changes are made to the scooters during the production run. Early Series III Lambrettas still had the old ignition system of the Series II. This was later replaced by a stator plate with six coils and a beefed-up flywheel. In 1965 the chrome ring under the headset is dropped, the gap is covered by a longer neck of the headset. From frame no. 94018, the LI 125 got a close ratio gearbox, which was also used in the LI 150 Special, known as the 'Pacemaker' gearbox.

In 1967 Innocenti finally produced a mystery on two wheels, the LI 125 Series IV. It is widely unkown, as it was by-and-large a Series III, but the frame numbers started with 125LI4. Looking closer, there are however some slight differences to the standard LI: the side-panels no longer have handles, but retaining clips like the DL. Gone is also the LI 125 badge behind the seat, which is replaced by an Innocenti badge as it was used on the SX. The horncasting badge is rectangular and reads Innocenti in silver above blue. Under the panels, the toolbox now is made from grey plastic, apart from that not much is changed. The Series IV is only available in light blue (8070) while all interiors are painted white (8059). It is not known if any special advertising materials for the Series IV was produced.

Overall, the Series III is a huge success for Innocenti, with 143.091 LI 150 and 146.734 LI 125 models produced. After the production code 150LI3, frame numbers start with 600.001. For the LI 125, things are not that simple: the first models start with frame no. 001.001 up until number 148.000. From then on, the production code reads 125LI4 and numbers start from 149.000, roughly up until 150.400.

Production period:
Production code:
1st frame no.:
Li 125
125 cc


Production period:
Production code:
1st frame no.:
Li 125
125 cc


Production period:
Production code:
1st frame no.:
Li 125
125 cc


Li series 3 – 1st version

The distance between the two bridgepiece-screws is 120mm (as Series II). The side-panel buffers are entirely made from rubber.


Li series 3 – 2nd version
(End of 1962 until mid 1965)

The distance between the two bridgepiece-screws is now 132mm. Side-panel buffers are being held by a clip.


Li series 3 – 3rd version
(mid 1965 until May 1967)

The chrome-ring under the headset disappears. The side-panel locking mechanism is simplified (from January 1966).


Li series 3 – 4th version
(September 1967 until November 1967)

Rectangular Innocenti badge at the horncasting. Clip-on side-panels, rear frame badge reads 'Lambretta Innocenti'.


Original paint (Lechler)

Grigio '61
8068 (*1)
Celeste Iseo
8035 (*1)
? (*1)

Li 125 "Serie 4":
Azzurro Acquamarina
8030 (*1)

(*1) = single tone scheme
(*2) = two tone scheme, frame colour
(*3) = two tone scheme, sidepanel colour


Vehicle (general)
name: LI 125 (series 3)
year of manufacture: 1961, 1962, 1963, 1964, 1965, 1966, 1967
VIN: 125LI
no. of exemplars produced: 146734
colours: celeste iseo (8035), grigio '61 (8068)
Vehicle sizes
length: 1800 mm
width: 700 mm
height: 1035 mm
seat height: 785 mm
ground clearance: 165 mm
wheelbase: 1290 mm
petrol tank capacity: 8.5 l
tank reserve (petrol): 0.75 l
weight (dry): 104 kg
weight (kerb): 118 kg
weight (max): 260 kg
Vehicle wheels
front tyre: 3.50 - 10
rear tyre: 3.50 - 10
front wheel rim: 2.15 - 10
rear wheel rim: 2.15 - 10
Vehicle brakes
front brake type: drum brake
front brake operation: mechanical with cable
Ø front: 150 mm
rear brake type: drum brake
rear brake operation: mechanical with cable
Ø rear: 150 mm
Vehicle suspension
front suspension type: spring only, trailing link fork
rear suspension type: shock absorber
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): 4.05 kW
power (HP): 5.5
rpm (P max): 5200
compression ratio: 1:7.5
mixture preparation: carburettor
carburettor: Dell'Orto SH1/18
starter: kickstarter
clutch: manual
engine brand: Innocenti
max speed: 79 km/h
engine type: 2-stroke
emission standard: none
Vehicle engine - ignition
ignition type: point set ignition
advanced ignition: 23
points distance: 0.4 mm
power (light): 30 W
voltage: 6 V
spark plug: (NGK) B7ES
Vehicle engine - gearbox
gear change type: manual
no. of gears: 4
Fahrzeug Betriebsstoffe
fuel: Super (ROZ 95)
mix ratio: 1:50
gearbox oil: SAE80
gearbox oil capacity: 0.7 l
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