Vespa 125 Largeframe (1957-1965): Complete Model Guide
Contents
Overview of the Vespa 125 Largeframe
The Vespa 125 Largeframe models, produced from 1957 to 1965, represent an important evolution in Piaggio's scooter design. These iconic vehicles featured VNA and VNB prefix model designations, with each variant offering improvements in design, performance, and features.
The 125cc models were notable for their distinctive horn design with horizontal lines, specific taillight configurations, and either square or clamshell speedometers depending on the production year. While considered somewhat underpowered by modern standards with their 6-volt electrical systems and 8" wheels, these vintage Vespas remain highly coveted by collectors and enthusiasts for their classic styling and historical significance.
History and Evolution of the Vespa 125
The VNA/VNB was the prefix for the 125cc models. The "A" models were the first ones produced and were later followed by the "B" models when the rear of the frame was flattened out. With the exception of the headset, the bodies on the VNA/VNB and VBA/VBB are identical.
Early VNA's featured a split headset design for easy access to control cables – a practical feature Piaggio discontinued in later VNA versions and didn't reintroduce until the P-series in the late 1970s. The evolution of these models saw significant technical improvements, particularly in ignition systems.
The early 125's used a small high tension ignition coil housed on the stator plate with fewer coils. Later models featured a stator with three coils and a large external high-tension ignition coil in a bakelite case, along with points ignition.
Vespa 125 Series and Models
The Vespa 125 Largeframe was produced in multiple series, each with distinctive characteristics and improvements. Below is a comprehensive breakdown of each model variant.
VNA Series (1957-1959)
VNA1T (1957-1958)
The very early VNA motors for 1958 had a "hybrid" design that was not rotary valve. They used a 5% two-stroke mixture, which by 1959 was replaced with the vastly superior rotary valve design. This model established the foundation for future variants.
VNA2T (1958-1959)
An evolution of the VNA1T with improved performance and reliability. This model introduced the rotary valve engine design that would become standard in subsequent variants, offering better performance characteristics.
VNB Series First Series - MK1 (1959-1961)
VNB1T (1959-1961)
Introduced the flattened rear frame design that distinguished the VNB series from the VNA. The engine specifications were improved for better performance, with a compression ratio of 7.2:1 and power output of 4.6 HP at 5000 rpm.
VNB2T (1961)
A short production run model that maintained the characteristics of the MK1 series with minor refinements to reliability and performance while keeping the 3-speed transmission.
VNB Series Second Series - MK2 (1961-1963)
VNB3T (1961-1962)
Introduced significant changes to the electrical system, with the 6V AC system no longer using the battery and rectifier found in previous models. The lighthouse diameter increased to 115mm, and lighting improvements were implemented.
VNB4T (1962-1963)
Continued the MK2 series design with incremental improvements to reliability and performance, maintaining the 3-speed transmission and 78 km/h maximum speed.
VNB Series Third Series - MK3 (1963-1965)
VNB5T (1963-1964)
A significant evolution featuring a 4-speed transmission instead of the 3-speed found in earlier models. Power output increased to 5.3 HP at 5000 rpm, and the compression ratio improved to 7.7:1.
VNB6T (1964-1965)
The final model in the 125 Largeframe series, maintaining the 4-speed transmission and improved power output of the VNB5T with additional refinements to reliability and performance.
Vespa 125 Technical Specifications
Below are the detailed technical specifications for each model variant of the Vespa 125 Largeframe series. These specifications are essential for restoration, maintenance, and historical documentation.
| Model | Frame Type | Rim Size | Gears | Max Speed | Engine Specifications |
|---|---|---|---|---|---|
| VNA1T (1957-1958) | Largeframe | 8" | 3 gears | 75 km/h |
Single cylinder, air-cooled 2-stroke Induction: piston ported Bore: 54 mm, Stroke: 54 mm Capacity: 123.67 cc Compression ratio: 6.3:1 Power: 4.5 HP @ 5000 rpm Lubrication: 5% mixture |
| VNA2T (1958-1959) | Largeframe | 8" | 3 gears | 75 km/h |
Single cylinder, air-cooled 2-stroke Induction: disc valve Bore: 54 mm, Stroke: 54 mm Capacity: 123.67 cc Compression ratio: 6.3:1 Power: 4.5 HP @ 5000 rpm Lubrication: 5% mixture |
Electrical Systems
The electrical systems varied across models, with later models featuring notable changes:
- Early models: Mixed AC and DC 6V system with external rectifier, 35W output
- Later models (from VNB3): 6V AC system without battery and rectifier
- Front light: Lighthouse diameter 105mm (115mm from VNB3T)
- Rear light: 6V - 3W (increased to 6V - 5W on VNB3T), with 6V - 10W brake light
Vespa 125 VIN Numbers and Production Figures
Understanding the VIN (Vehicle Identification Number) or chassis number is crucial for authenticating and dating vintage Vespas. The table below provides detailed information on VIN ranges and production volumes for all Vespa 125 Largeframe models.
| Model | Year | VIN Range | Units Produced |
|---|---|---|---|
| VNA1T | 1957 | 1001 - 10300 | 9,299 |
| VNA1T | 1958 | 10301 - 68031 | 57,730 |
Useful Resources for Vespa 125 Owners
These links provide additional detailed information on specific Vespa 125 models, helping owners with restoration, maintenance, and historical research.
Model-Specific Resources
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Buy a Vespa 125 Largeframe
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Frequently Asked Questions
How can I identify which Vespa 125 model I have?
Check your VIN (chassis number) against our comprehensive chart. Additionally, design elements like headset configuration, taillight design, and speedometer type can help identify the exact model and production year.