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Lambro 175

Italian Production Dates: 1963 - August 1965
Frame Prefix: M41


The Lambro 175 was launched in September 1963. They began from Chassis Number 499501. It is a culmination of the technical amendments made to the Lambretta Li 175 Series 2 although rebadged to bring it in line with the new Lambro 200 as they were marketed alongside each other as a range. Identifying features include the single headlight, non-suicide doors and 200cc stud spacing with a sleeved barrel.

The Chassis Prefix was changed from T41 to M41 previously to the badge change. Although we have yet to prove the exact date, we suspect it was in June 1963 with the launch of the M42 Lambro 200 and therefore there are cross over Lambros with the M41 chassis prefix.


Overall Dimensions

Maximum Length: Open Body Type:  2770mm Maximum height: Cabin: 1620mm
  Closed Body Type: 2710mm   Open Body: 775mm
      Box Body: 1415mm
Maximum width : 1330mm    
Ground Clearance: 120mm Track width: 1180mm
Wheelbase: 1710mm    


Frame and Cabin

Frame Tubular Steel backbone with superstructures for the support of the cab and the body. Cradle for spare wheel
Front suspension: by means of rocker arms connected to levers with end balls compressing through guide pistons two variable pitch helical springs.
  Possibility of application of the shock absorbers
Rear suspension: with two longitudinal leaf springs anchored to the frame at the front and shackled at the rear
  Possibility of application of the shock absorbers
Cabin: Pressed steel, rear window equipped with rear curtain, instrument panel, holes for attaching the door hinges, rear-view mirror.
Windscreen: Curved glass windscreen with rubber beading.
Windscreen Wiper: Windscreen wiper hand operated (an electrical windscreen wiper can be fitted in place)
Seat: Double seat bench over engine cover
Doors: Doors (accessory) complete with glass windows (left hand door with normal type lock, right hand door with locking device in handle).


Wheels and Brakes

Wheels Interchangeable wheels Tyres: front: 4.00 x 8”
  Rims in pressed steel in two halves   rear: 4.00 x 8” T (T mark indicated heavy tread tyres for commercial use)
Brakes: Internal expansion brakes. mechanically controlled by lever on the right handlebar for the front brake - foot operated hydraulic rear brakes Tyre pressures at full load: Front: 2 kg/cm square
  Hand lever parking brakes on rear wheels.   Rear: 3.5 kg/cm square


Rear Axle:

Consisting of: central differential box:
  rear axle housing
  sliding half-shafts easily withdrawn by removal of wheel flange


Electrical Equipment

The 6-pin 80W flywheel alternator feeds the 12V - 18 Ah battery through the rectifier-regulator group

The charging circuit is protected by a fuse (15A) located on the wiring block on the crossbar under the seat. The user circuits are protected by 5 fuses (8A each), arranged below the dashboard.

The direction indicators flasher unit and the electrical wiper switch (accessory) are live only with the ignition switched on (ie key and switch on the dashboard in the positions 1,2,3)

The horn and rear stop lights can be operated without ignition key inserted.

The battery must be always regularly connected, otherwise engine start can be faulty and dangerous overloading of the circuits can occur during running.

The red indicator bulb on the dashboard comes on with the ignition on and stays on with the engine running. Should turn off when the ignition is switched off

Position Use Number
Electrical Type of Bulb Type of Fitting
Headlight Dual Filament. Full beam/dipped
12V-25 / 25W Spherical BA 20 d
Front Side Lights Parking
12V-5/15W Spherical BAY 15d/19
  Front Indicators
12V-3W Cylindrical BA 9 s
Rear Side Lights Parking and Stop
12V-5/15W Spherical BAY 15d/19
  Rear Indicators
12V-15W Spherical BA 15 s
Dashboard Ignition
24V-3W Festoon S 7/8
12V-3W Festoon S 7/8
12V-3W Festoon S 7/8
Speedometer (accessory) Illumination of speedo
12V-3W Cylindrical BA 9 s


Engine: Single cylinder two stoke, forced air cooled. Carburettor Dell’Orto MA 19 BS 7 – Cartridge type air filter
Bore: 62mm Choke: 19
Stroke: 58mm Max. Jet: 80
Capacity: 175cc Pilot Jet: 40
Compression Ratio: 7 Starter Jet: 55
Output: 7 H.P. at 4750 R.P.M. Atomizer 260 B
    Needle mounted on the middle notch D 21

Ignition flywheel alternator, battery, external HT coil. Fixed advance
Spark Plug: during running in – 225 Bosch scale heat range
  after running-in – 225 – 240 Bosch scale heat range, according to conditions
Start: Pedal / Kickstart (on the left of the engine)
Clutch: Multi-disc type in oil bath
Gear Box: gearbox with four speeds and reverse constant mesh gears ,alternately splined to the secondary shaft by coupling sliders
Total transmission ratios
1st gear: 1/28.050
  2nd gear: 1/16.107
  3rd gear: 1/10.131
  4th gear: 1/6.875
  Reverse: 1/29.987
Transmission From engine to gearbox: by gears with flexible coupling.
  From gearbox to rear axle: by hollow shaft with splined couplings and two flexible couplings



Dry Weight without accessories and doors. Open Type Body              290kg Useable height of body (box type)   840mm
  Box Type body                  325kg Maximum permissible total weight (dry weight + accessories & fuel + crew + load) 800kg
Useable length of Body Open Type Body             1330mm Max. pay load Open Body: 400kg
  Box Type body                  1180mm   Closed Body: 380kg
Useable width of body Open Type Body              1230mm Max Speed Empty   38 mph (61km/h)
  Box Type body                  1100mm   At full load 36 mph (58km/h)
Min. Turning Radius: 2565mm Tank Capacity: 11.5 litres
    Range: 170 miles (275km)

(to CUNA rules) at full load at 22m.p.h: 80m.p.g (3.5lit/100km)


Documents and Pictures



NOTE: Technical specifications have been taken directly from Innocenti documentation eg User Manuals for each model. Later workshop manuals and amendments made after the publication of each manual may mean that these details appear differently in other documentation and may be different for your particular model.

Lambro 175 Uso e manutenzione Prop/IT 1.64