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AJS Model 31 650 Swift
1966Allround

AJS Model 31 650 Swift

Key specifications

Engine
646 cc
Power
31 HP
Weight
176 kg
Fuel type
petrol
Fuel capacity
4.2 L
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1966 AJS Model 31 650 Swift The 1966 AJS Model 31 650 Swift stands as a testament to the golden age of British motorcycling, perfectly positioned in the allround category. This motorcycle was crafted for those who sought versatility without compromising on style or performance. With its distinctive classic aesthetics and robust build, it appealed to both everyday riders and enthusiasts alike. The Model 31 Swift became a staple for those who wanted a reliable companion for both city commutes and weekend adventures, encapsulating the spirit of freedom that defined the era. Engine Performance and Riding Characteristics At the heart of the AJS Model 31 is a twin, four-stroke engine that boasts a displacement of 646cc, delivering a spirited 31.40 horsepower at 6000 RPM. This power train, coupled with a compression ratio of 7.5:1, allows for a smooth and responsive ride that’s both enjoyable and engaging. Riders will appreciate the delightful torque delivery, allowing for confident acceleration out of corners and a satisfying rush on straightaways. The motorcycle’s wet multiplate clutch and chain final drive contribute to seamless gear transitions, making it an absolute joy to navigate through winding roads or urban traffic. With its lightweight frame tipping the scales at just 176 kg (388 pounds), the Model 31 offers a nimble and balanced ride, making it accessible for riders of various skill levels. Key Features and Technology The AJS Model 31 is not just about performance; it’s also packed with thoughtful features that enhance the riding experience. The double cradle frame provides optimal stability, while the hydraulic telescopic front suspension and twin shock Girling rear suspension work in harmony to absorb bumps and ensure a comfortable ride. Both the front and rear drum brakes offer reliable stopping power, although they reflect the technology of their time. The classic design is complemented by the use of a magneto ignition and air cooling, which adds a nostalgic charm while ensuring the engine runs reliably. With a fuel capacity of 16 liters (4.23 gallons), riders can enjoy longer rides with fewer stops, enhancing the overall experience of the open road. **

Pros

    Cons

    • Classic Aesthetic: The 1966 AJS Model 31 Swift exudes vintage charm, appealing to classic motorcycle enthusiasts.
    • Balanced Performance: With its lightweight build and responsive engine, the Model 31 delivers a nimble and enjoyable ride.
    • Versatile Design: Suitable for both daily commuting and weekend excursions, making it a practical choice for various riding conditions.
    • Braking Technology: The drum brakes, while reliable for their time, may not provide the stopping power expected by modern standards.
    • Limited Power: With 31.40 HP, some riders may find the performance lacking compared to contemporary machines.
    • Maintenance Needs: As with many classic bikes, the AJS Model 31 requires regular upkeep and may not be as user-friendly for novice mechanics.

    Technical details

    Source specification data

    Make
    AJS
    Model
    Model 31 650 Swift
    Category
    Allround
    Power
    31.40 HP (22.9 kW)) @ 6000 RPM
    Clutch
    Wet multiplate
    Ignition
    Magneto
    Fuel System
    Carburettor
    Bore X Stroke
    72.0 x 79.3 mm (2.8 x 3.1 inches)
    Compression
    7.5:1
    Displacement
    646.00 ccm (39.42 cubic inches)
    Cooling System
    Air
    Engine Details
    Twin, four-stroke
    Transmission Type Final Drive
    Chain
    Dry Weight
    176.0 kg (388.0 pounds)
    Fuel Capacity
    16.00 litres (4.23 gallons)
    Power Weight Ratio
    0.1784 HP/kg
    Wheels
    Spoked
    Frame Type
    Doble cradle
    Rear Brakes
    Expanding brake (drum brake)
    Front Brakes
    Expanding brake (drum brake)
    Rear Suspension
    Twin shock Girling
    Front Suspension
    Hydraulic telescopic