
AJS Model 31 650 Swift
Key specifications
Overview
Introducing the 1961 AJS Model 31 650 Swift, a classic motorcycle that epitomizes the spirit of British motorcycling in the early 1960s. Renowned for its all-round capabilities, the Model 31 is an appealing choice for riders who crave a blend of performance, comfort, and timeless aesthetics. With its distinctive styling and robust engineering, this model stands as a testament to AJS's commitment to producing reliable and versatile motorcycles that cater to both seasoned riders and newcomers alike. At the heart of the AJS Model 31 is its 646cc twin-cylinder, four-stroke engine, delivering a respectable 31.4 HP at 6000 RPM. This power allows for a smooth and responsive ride, making it particularly well-suited for both city commuting and longer journeys on winding country roads. The engine's compression ratio of 7.5:1 combines with a well-tuned carburettor to deliver reliable performance, while the 4-speed gearbox offers a satisfying engagement that enhances the riding experience. Coupled with a wet multiplate clutch and chain final drive, the Model 31 strikes a perfect balance between power and agility, making it an enjoyable motorcycle to ride at any pace. The AJS Model 31 also boasts several key features that enhance its appeal. The double cradle frame provides a solid foundation, while the hydraulic telescopic front suspension and twin shock Girling rear suspension work in harmony to deliver a comfortable ride over uneven terrain. The expanding drum brakes, both front and rear, ensure dependable stopping power, further enhancing rider confidence. With a weight of 176 kg and a fuel capacity of 16 liters, this bike is designed for long rides, allowing enthusiasts to explore the open road without the frequent need for refueling. The classic kick starter not only adds to its vintage charm but also connects riders to the authentic motorcycling experience of yesteryear. **
Pros
- Timeless Design: The classic styling and elegant lines of the Model 31 make it a head-turner at any gathering or on the open road.
- Versatile Performance: With a capable engine and comfortable suspension, it excels in both urban commuting and leisurely country rides.
- Strong Community: As a classic motorcycle, the AJS Model 31 has a dedicated following, making it easy to find support, parts, and enthusiasts.
Cons
- Weight Considerations: At 176 kg, it may feel heavy for newer riders or those looking for something more nimble.
- Drum Brakes: While reliable, the drum brakes may not offer the same stopping power or responsiveness as modern disc brakes.
- Kick Start Only: The traditional kick starter may prove challenging for some, especially in colder weather or for those unaccustomed to the technique.
Technical details
Source specification data
- Make
- AJS
- Model
- Model 31 650 Swift
- Category
- Allround
- Starter
- Kick
- Power
- 31.40 HP (22.9 kW)) @ 6000 RPM
- Clutch
- Wet multiplate
- Gearbox
- 4-speed
- Ignition
- Bobine
- 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
- Seat
- Dual
- Wheels
- Spoked
- Rear Tyre
- 3.25-19
- Frame Type
- Doble cradle
- Front Tyre
- 3.25-19
- Rear Brakes
- Expanding brake (drum brake)
- Front Brakes
- Expanding brake (drum brake)
- Rear Suspension
- Twin shock Girling
- Front Suspension
- Hydraulic telescopic