What is the engine displacement of the 1966 AJS 31 650 Swift?

The 1966 AJS 31 650 Swift has an engine displacement of 646.0 ccm (39.42 cubic inches).

How much horsepower does the 1966 AJS 31 650 Swift have?

The 1966 AJS 31 650 Swift produces 31.4 HP (22.9 kW )) @ 6000 RPM of power.

How much does the 1966 AJS 31 650 Swift weigh?

The 1966 AJS 31 650 Swift has a dry weight of 176.0 kg (388.0 pounds).

1966 AJS 31 650 Swift Price, Specs, Review

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Review

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The 1966 AJS Model 31 650 Swift represents a pinnacle of AJS engineering in its era. Its 646cc engine, producing 31.4 horsepower at 6000 RPM, delivers a spirited and responsive performance. The 4-speed gearbox provides smooth and precise gear changes, enhancing the overall riding experience. This model could achieve a respectable speed for its time. Weighing in at a relatively light 388 pounds, the Model 31 650 Swift offers nimble handling and easy maneuverability. The hydraulic telescopic front suspension provides a comfortable and controlled ride, absorbing bumps and imperfections in the road. The expanding drum brake offers adequate stopping power, typical for motorcycles of this period. With a 4.23 US gallon fuel tank, it's suitable for longer rides without frequent stops. This AJS is ideal for riders who appreciate classic British motorcycles and seek a rewarding riding experience. It's a great choice for those who enjoy weekend rides and exploring scenic routes. The Model 31 650 Swift offers a blend of vintage charm and engaging performance, making it a desirable machine for classic motorcycle enthusiasts.

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Pros (Advantages)

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✅ Why buy this bike?

• Classic British parallel-twin design offers a nostalgic riding experience with period charm. • Relatively simple mechanicals make home maintenance and repairs accessible for enthusiasts. • Robust 650cc engine provides decent power for its era, suitable for touring and open roads. • Strong club support and parts availability for AJS models ensure long-term ownership viability. • Distinctive exhaust note and styling offer unique character, standing out from modern bikes. • Often more affordable than comparable BSA or Triumph models from the same period.

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Cons (Disadvantages)

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⚠️ Things to consider

• Vibrations from the parallel-twin engine can be significant, especially at higher RPMs. • Braking performance (drum brakes) is rudimentary by modern standards, requiring anticipation. • Electrical system (likely 6V positive earth) can be temperamental and less reliable. • Oil leaks are common, a characteristic of many British bikes of this vintage. • Suspension components are basic, offering limited adjustability and a firm ride.

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License Class (EU)

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The AJS 31 650 Swift produces 31 HP, fitting A2 license limits (max 35 kW / 47 HP). For riders 18+.

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Fuel Economy & Running Costs

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Estimated average for 646cc class: 35-50 mpg (5.0-7.0 L/100km)

⛽ Tank: 16.00 litres (4.23 US gallons)

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Insurance Class

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