| Attribute | AJS Model 20 500 1959 × | Moto Guzzi Dondolino 1951 × |
|---|---|---|
| General | ||
| Production from (year) | 1959 | 1951 |
| Make | AJS | Moto Guzzi |
| Model | AJS Model 20 500 | Moto Guzzi Dondolino |
| Category | Allround | Sport |
| Engine and transmission | ||
| Engine type | Twin, four-stroke | Single cylinder, two-stroke |
| Fuel system | Carburettor | Carburettor. DellÓrto SSM |
| Displacement (cm³) | 498 | 498 |
| Power (kw) | 14.6 | - |
| Cooling system | Air | - |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 66 | - |
| Stroke (mm) | 72.8 | - |
| Fuel control | - | Overhead Valves (OHV) |
| Ignition | Magneto | Magneto |
| Clutch | Wet multiplate | - |
| Compression | 7.0:1 | - |
| 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 | - |
| Front tyre | 3.25-19 | - |
| Rear tyre | 3.25-19 | - |
| Seat | - | Single |
| Wheels | Spoked | Spoked |
| Dimensions | ||
| Dry weight (kg) | 178 | 127 |
| Power/weight ratio | 0.082 | - |
| Performance | ||
| Top speed (km/h) | 137 | 177 |
| Fuel capacity (l) | 13.5 | 19 |