The AJS Model 20 500 (1948-61) was a four-stroke, parallel twin-cylinder motorcycle with a capacity of 498cc and a compression ratio of 7.3:1. It featured 2 valves per cylinder, a 3-saved plain bearing/roller bearing crankshaft, and a Lucas magneto ignition with kick starting. The clutch was a multi-plate dry Burman and the transmission was 4-speed with a chain final drive. The frame was a single cradle with hydraulic telescopic fork front suspension and dual shocks in the rear. The brakes were drums both front and rear, and it had 3.25-18 tyres on both the front and rear. The fuel capacity was 17 L / 4.5 US gal and the top speed was 150 km/h / 93 mph. The bike weighed 178 kg / 392 lbs and had an oil capacity of 2.5 L / 5.3 US pt. It was a popular motorcycle during its production years.
Technical specifications:
Make Model: AJS Model 20 500
| Year | 1948 – 61 |
|---|---|
| Engine | Four stroke, parallel twin cylinder, OHV. 2 valve per cylinder, Crankshaft: 3-saved plain bearing / roller bearing |
| Capacity | 498 cc / 30.4 cu in |
| Bore x Stroke | 66 x 72.8 mm |
| Compression Ratio | 7.3:1 |
| Cooling System | Air cooled |
| Oil Capacity | 2.5 L / 5.3 US pt |
| Induction | Carburetor |
| Ignition | Lucas magneto, K2F |
| Spark plug | KLG FE80, 14 mm thread |
| Starting | Kick |
| Clutch | Multi Plate (dry, Burman) |
| Max Power | 21.6 kW / 29 hp |
| Transmission | 4 Speed |
| Final Drive | 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 / 392 lbs |
| Fuel Capacity | 17 L / 4.5 US gal |
| Top Speed | 150 km/h / 93 mph |
