| Attribute | Yamaha XJ 550 H × | Rudge Ulster 500 1929 × |
|---|---|---|
| General | ||
| Production from (year) | 1981 | 1929 |
| Make | Yamaha | Rudge |
| Model | Yamaha XJ 550 H | Rudge Ulster 500 |
| Category | Classic | Sport |
| Engine and transmission | ||
| Engine type | In-line four, four-stroke | Single cylinder, four-stroke |
| Valves per cylinder | 2 | - |
| Fuel system | Carburettor | Carburettor |
| Displacement (cm³) | 528 | 499 |
| Power (kw) | 36.5 | 32.8 |
| Cooling system | Air | Air |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 57 | 85 |
| Stroke (mm) | 51.8 | 88 |
| Gearbox | 6-speed | - |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) | Overhead Valves (OHV) |
| Compression | 9.5:1 | - |
| Chassis | ||
| Front brakes | Single disc | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Seat | - | Single spring-mounted |
| Wheels | - | Spoked |
| Other | ||
| Starter | Electric | - |
| Performance | ||
| Top speed (km/h) | 176 | 160 |
| Fuel capacity (l) | 14.98 | - |