Model B 125

The Lambretta model B was an update to the Model A 125 with integrated suspension in the engine and larger 8 inch wheels.

Technical Specification

Model	B 125
AmountProduced	35014
Production Dates	November 1948 – January 1950
Frame Prefix	No Prefix
Engine Prefix	Tipo 3 (First 40) then Tipo B
Frame Starting Number	00001
Engine Starting Number	00001
Homologation	Unknown at this time
Engine	123cc, two stroke, 52x58mm
Power and Rate	4.3hp at 4200-4500rpm
Compression Ratio	1:6
Head and Cylinder	Aluminium and cast iron
Engine Cooling	Air
Ignition	Filso or Marelli magneto
Spark Advance	26' – 28' 33 – 35 mm on the circumference of the flywheel
Point Setting Flywheel	.40-.50 mm
Carburetor	dell'orto MA16
Choke	16mm
Slide	55
Needle	C9
Atomiser	260
Main Jet	65
Pilot Jet	45
Starter	N/A
Float	7.5 grams
Starter	Pedal
Crankcase oil	Mobil Oil A 180 grams
Transmission Oil	Special Grease 150 grams
Oil / Gas Mix	5%
Clutch	Multiple discs in oil bath
Gears	3 speed with hand shifter
1st
2nd
3rd
Primary Transmission	Gear
Secondary Transmission	Shaft and Gear
Frame	1250mm stamped metal
Front Suspension	movable paraellogram with helical springs
Rear Suspension	Joint attached to motor with hydraulic shock absorber
Wheels	Dismountable wheels
Tires	3.50 x 8 pirelli
Tire Presure	Front .7-8 ATM, rear 1.75 ATM
Brakes	Drum
Dry Weight	68kg
Km Per Gallon	1lt per 50km
Fuel Capacity	7lt plus .8lt reserve
Max Speed	65-70kmh
Initial Price	135,000 Italian Lira
Electrical System	6 volt
Sparkplug	Bosch 225 short thread
wheel Base
Maximum Length
Ground Clearance
Maximum Seat Hight
Minimum Turning Radius
Colour	Metalic Red 8023
	Metalic Blue 8024
	Metalic Green 8025
	Metalic Bronze 8053
Engine Colour	Fiat 690