AJS Model 31 650 Swiftback 1965 forward

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Air cooled, 646cc, Inline-2, OHV

Power: 42.96 HP (31.6 kW) @ 6000 rpm
Final drive: Chain
Dry weight: 388 lbs
Category: Classic
Tags: Classic bike, Touring
Engine and transmission
Engine type: 2 cylinders, 4-stroke, Inline
Displacement: 646 cc (39.47 cubic inches)
Bore × stroke: 2.83 inch × 3.12 inch (undersquare - longstroke)
Cooling system: Air cooled
Power: 42.96 HP (31.6 kW) @ 6000 rpm
Throttle: Cable operated
Valves
Valve train: OHV, variable
Valves per cylinder: 2
Fuel and ignition
Sparks per cylinder: 1
Fuel supply system: Carburetor
Ignition type: mechanically timed
Compression: 7.5:1
Engine mounting: Transverse
Lubrication system: Wet sump
Gear box: Manual 4-speed
Clutch: Wet, multiple discs, cable operated
Final drive: Chain
Starter: Kick-starter
Dimensions
Physical measures
Length: 86.2 inch
Width: 28 inch
Weight
Dry weight: 388 lbs
Chassis and suspension
Frame type: steel, Double cradle frame
Front
Suspension: Cartridge
Brake: Single Drum
Rear
Suspension: twin shock, Swingarm
Brake: Drum
Other
ABS available: No
Fuel capacity: 4.23 gals
Number of riders: 2 persons

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