Comparison of AJS Model 20 500 1954 and Horex Imperator 1958 [S]ave
| Attribute |  AJS Model 20 500 1954 × |  Horex Imperator 1958 × |
|---|---|---|
| General | ||
| Production from (year) | 1954 | 1958 |
| Make | AJS | Horex |
| Model | AJS Model 20 500 | Horex Imperator |
| Category | Allround | Allround |
| Engine and transmission | ||
| Engine type | Twin, four-stroke | Single cylinder, four-stroke |
| Fuel system | Carburettor | Carburettor |
| Displacement (cm³) | 498 | 400 |
| Power (kw) | 14.6 | 13.8 |
| Cooling system | Air | Air |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 66 | - |
| Stroke (mm) | 72.8 | - |
| Gearbox | 4-speed | - |
| Fuel control | - | Overhead Valves (OHV) |
| Ignition | Magneto | - |
| Clutch | Wet multiplate | - |
| Compression | 7.0:1 | 7.5:1 |
| Chassis | ||
| Front suspension | Telescopic | - |
| Rear suspension | Twin shock | - |
| Front brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Frame type | Single cradle | Duplex cradle |
| Front tyre | 3.25-19 | - |
| Rear tyre | 3.25-19 | - |
| Seat | Dual | - |
| Wheels | Spoked | - |
| Other | ||
| Starter | Kick | - |
| Dimensions | ||
| Dry weight (kg) | 178 | 196 |
| Power/weight ratio | 0.082 | 0.0704 |
| Overall height (mm) | 1,050 | 990 |
| Overall length (mm) | 2,190 | 2,140 |
| Overall width (mm) | 710 | 660 |
| Performance | ||
| Top speed (km/h) | 137 | 135 |
| Fuel capacity (l) | 13.5 | 17 |
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