| Attribute | Velocette KTT Mk VIII 1948 × | Harley-Davidson Crtt 250 1966 × |
|---|---|---|
| General | ||
| Production from (year) | 1948 | 1966 |
| Make | Velocette | Harley-Davidson |
| Model | Velocette KTT Mk VIII | Harley-Davidson Crtt 250 |
| Category | Sport | Cross / motocross |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, four-stroke |
| Fuel system | Carburettor | Carburettor |
| Displacement (cm³) | 348.4 | 250 |
| Power (kw) | 25.5 | - |
| Cooling system | Air | - |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 74 | 72 |
| Stroke (mm) | 81 | 61 |
| Gearbox | - | 5-speed |
| Fuel control | Overhead Valves (OHV) | Overhead Valves (OHV) |
| Clutch | Wet multiplate | - |
| Lubrication system | Dry sump | - |
| Compression | 7.8:1 | - |
| Chassis | ||
| Front brakes | Expanding brake (drum brake) | - |
| Rear brakes | Expanding brake (drum brake) | - |
| Frame type | Single cradle | - |
| Seat | Dual | Single Seat |
| Wheels | Spoked | - |
| Performance | ||
| Top speed (km/h) | 185 | 161 |