AJS Model 20 500 Spring Twin 
| Make Model | AJS Model 20 500 Spring Twin | | Year | 1952 | | Engine | Air cooled, four stroke, Parallel twin cylinder, OHV. 2 valve per cylinder, Crankshaft: 3-saved plain bearing / roller bearing | | Capacity | 489 | | Bore x Stroke | 66 x 72,8 mm | | Compression Ratio | 7,0 : 1 | | Induction | Carburetor | | Ignition / Starting | 6 Volt Magnet (Lucas K2F) / kick | | Clutch | Multi Plate (dry, Burman) | | Max Power | 29 hp | | Transmission / Drive | 4 Speed / chain | | Frame | Single cradle | | Front Suspension | Hydraulic telescopic fork | | Rear Suspension | Dual chocks | | Front Brakes | Drum | | Rear Brakes | Drum | | Front Tyre | 3.25 -18 | | Rear Tyre | 3.25 -18 | | Weight | 178 kg | | Fuel Capacity | 13.5 Litres | |
