AJS Model 20 500 (1948-61) vs AJS Model 30 600 (1956)
Comparison technical specifications
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| Make: | AJS | AJS |
| Model: | Model 20 500 | Model 30 600 |
| Years: | 1948-61 | 1956 |
| Engine: | Four stroke, parallel twin cylinder, OHV. 2 valve per cylinder, Crankshaft: 3-saved plain bearing / roller bearing | Four stroke, pushrod parallel twin, OHV, 2 valves per cylinder, |
| Capacity: | 498 cc / 30.4 cu in | 593 cc / 36.2 cu in |
| Bore x Stroke: | 66 x 72.8 mm | 72 x 72.8 mm |
| Compression Ratio: | 7.3:1 | 7.0 : 1 |
| Cooling System: | Air cooled | Air cooled |
| Induction: | Carburetor | Carburetor |
| Ignition: | Lucas magneto, K2F | 6 Volt Magnet (Lucas K2F) |
| Starting: | Kick | Kick |
| Clutch: | Multi Plate (dry, Burman) | Multi Plate (dry, Burman) |
| Max Power: | 21.6 kW / 29 hp | 24.6 kW / 33 hp @ 6800rpm |
| Transmission: | 4 Speed | 4 Speed |
| Frame: | Single cradle | Single cradle |
| Front Suspension: | Hydraulic telescopic fork | Hydraulic telescopic fork |
| Rear Suspension: | Dual chocks | Dual chocks |
| Front Brakes: | Drum | Drum |
| Rear Brakes: | Drum | Drum |
| Front Tyre: | 3.25 -18 | 3.25 -19 |
| Rear Tyre: | 3.25 -18 | 3.50 -19 |
| Weight: | 178 kg / 392 lbs | 178 kg / 396 lbs |
| Fuel Capacity: | 17 L / 4.5 US gal | 16 L / 4.2 US gal |
| Top Speed: | 150 km/h / 93 mph | 95mph / 152 kph |