Model B 125
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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 |