| MODEL | VELOCETTE KTT MK VI - VIII 1935 - 1950 |
| Year | 1935 - 1950 |
| Engine Type | Four-stroke, single cylinder, overhead camshaft |
| Displacement / Capacity | 348 cc / 21.3 cu in |
| Bore X Stroke | 74 x 81 mm |
| Compression Ratio | — |
| Cooling System | Air |
| Max Power | 25.7 kW / 35 hp @ 5800 rpm |
| Max Torque | — |
| Ignition | Magneto |
| Induction | Amal carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Dry sump |
| Gear Box | 4-speed, foot change |
| Clutch | Wet multi-plate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Single cradle |
| Front Suspension | Webb fork with two friction dampers |
| Rear Suspension | Mk VIII: swingarm with two oleo-pneumatic units; Mk VI and VII rigid |
| Front Brakes | 7 in magnesium drum, single leading shoe |
| Rear Brakes | 7 in magnesium drum, single leading shoe |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 125 kg / 275 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | — |
| Rear Tyre | — |
| FUEL SYSTEM | |
| Fuel Capacity | 11.4 Litres / 4 US gal |
| Fuel Consumption | — |
| Top Speed | 185 km/h / 115 mph |
The later KTT racers: the Mk VI prototype carried the Mk V engine in a new frame, the Mk VII was the first series model with an alloy head, and the Mk VIII added swingarm rear suspension. The Mk VIII won the 350 cc world title with Freddie Frith in 1949 and about 238 were built.
