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| Model | Velocette KTT Mk VIII |
| Year | 1939 |
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| Displacement | 348.4 ccm (21.26 cubic inches) |
| Engine type | Single cylinder, four-stroke |
| Power | 35.0 HP (25.5 kW) @ 5800 RPM |
| Top speed | 185.0 km/h (115.0 mph) |
| Compression | 7.8:1 |
| Bore x stroke | 74.0 x 81.0 mm (2.9 x 3.2 inches) |
| Fuel system | Carburettor. Amal |
| Fuel control | Overhead Valves (OHV) |
| Ignition | Bobine |
| Lubrication system | Dry sump |
| Cooling system | Air |
| Transmission type | Chain (final drive) |
| Clutch | Wet multiplate |
| Exhaust system | Single -Chrome |
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|---|
| Frame type | Single cradle |
| Front brakes | Expanding brake (drum brake) |
| Diameter | 178 mm (7.0 inches) |
| Rear brakes | Expanding brake (drum brake) |
| Diameter | 178 mm (7.0 inches) |
| Wheels | Spoked |
| Seat | Dual |
| Dry weight | 125.0 kg (275.6 pounds) |
| Power/weight ratio | 0.2800 HP/kg |
| Fuel capacity | 11.40 litres (3.01 US gallons) |
