M and M Lambretta

Lambretta Model B


Production Dates: November 1948 to January 1950
Serial Number Range:
 000001 - 035014
Quantity Produced: 35,014
Main Specs:
Overall Length:
 1620 mm / 64 in
Overall Height: 880 mm / 35 in
Overall Width:
 650 mm / 26 in
Weight (dry): ~55 kg  / 121.25 lbs
Gears: 3 speed - Hand controlled Teleflex cable
Speed Max:
 65 - 70 kmh / 40 - 44 mph
Tire Size:
 3.50 x 7
Brakes:
 Drums Front & Rear w/steel brake shoes
Fuel Tank:
 6 liters / 1.32 gal -  0.8 liters / 0.18 gal reserve
Consumption:
 ~39 kpl / 110 mpg
Engine Specs:
Capacity (cc):
 123
Bore:
 52 mm
Stroke:
 58 mm
Compression:
 6:1
Max Output:
 4.3 bhp @ 4500 rpm
Cooling:
 Air
Carburettor:
Type:
 Dellorto MA 16 (MA 19 ex-factory)
Choke:
 16 mm (or 19mm)
Slide:
 55
Needle:
 C9
Atomizer:
 260
Main Jet:
 65
Pilot Jet:
 45
Starter Jet:
  --
Float:
 7.5 grams
Air Screw Adj:
 1 - 2 turns
Service Info:
Spark Plug:
 Champion L7, L10S
NGK B7HS
Spark Plug Gap:
 0.015
Timing:
 26 degrees BTDC
Points Gap:
 0.40 - 0.50 mm
Engine Oil:
 SAE 15/50 180 grams
Transmission Oil:
 Special grease
Tire Pressure:
 Front 14 psi / Rear 22 psi
Fuel Mix:
 5% or 20:1
Paint Information:
Lechler Color Name
 Lechler Color Code
Azzurro Metallizzato / Metallic Blue 8024
Rosso Metallizzato / Metallic Red 8023
Verde Metallizzato / Green Metallic 8025
Bronzo Metallizzato / Bronze Metallic 8053


All Versions of the 125 B:
All the same color Metallic Blue 8024, Metallic Red 8023, Metallic Green 8025 or Metallic Bronze 8053 with the exception of the seat frame, wheels, wheel hubs, centerstand and internal suspension parts which were all painted Fiat Aluminum 690.

The engine case, carburetor body, air filter box, bronze frame between the toolbox and flywheel cover are all painted Fiat Aluminum 690.
Model Notes:

 Gear change now on the handle bars, a feature to stay with the rest of the  models ever made.

First Version until approx vin # 20,000
Heal-operated rear brake pedal, internal clutch actuator, light switch located on headlight (the switch was moved to the handlebar on the last 2,000 units), cylindrical rubber buffers between the gas tank and toolbox.

Second Version up until approx vin # 40,000
Toe-operated (traditional) rear brake pedal, clutch actuator is on the outside of the engine case, light switch located on the handlebars (the first 5,000 units of the second version had the kill switch located on the frame), rubber buffers were eliminated between the gas tank and glove box.

Third Version up until end of production
Internal rear suspension lever is thicker and secured with screws, toolbox door rubbers are eliminated.

Sources used for the above information:
1. Publication Section
2. Peter Davies - information reproduced with written permission
3. Paint colors - many various sources from the UK
4. Model notes - many various sources from the UK

Details pertaining to restoration broken down by VIN range, obtained from Casa Lambretta USA and reproduced with written permission.



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