| MODEL | HOREX REGINA 400 1953 - 1956 |
| Year | 1953 - 1956 |
| Engine Type | Single-cylinder, four-stroke, overhead valves (pushrod) |
| Displacement / Capacity | 399 cc / 24.3 cu in |
| Bore X Stroke | 74.5 x 91.5 mm |
| Compression Ratio | — |
| Cooling System | Air |
| Max Power | 16.2 kW / 22 PS @ 5750 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | Carburettor (27.5 mm bore) |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4-speed, foot change |
| Clutch | Multi-plate, oil bath |
| Final Drive | Enclosed chain |
| CHASSIS SPECS | |
| Frame | Open-cradle tubular steel |
| Front Suspension | Hydraulic telescopic fork |
| Rear Suspension | Telescopic (plunger-type) units |
| Front Brakes | Drum (light-alloy full-hub, single leading shoe) |
| Rear Brakes | Drum (light-alloy full-hub, single leading shoe) |
| DIMENSION SPECS | |
| Overall Length | 2120 mm / 83.5 in |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 760 mm / 29.9 in |
| Wheelbase | 1390 mm / 54.7 in |
| Ground Clearance | — |
| Dry Weight | 150 kg / 330.7 lb |
| Wet Weight | 165 kg / 363.8 lb (kerb) |
| WHEEL SPECS | |
| Front Tyre | — |
| Rear Tyre | — |
| FUEL SYSTEM | |
| Fuel Capacity | 18 Litres / 4.8 US gal |
| Fuel Consumption | — |
| Top Speed | 130 km/h / 80.8 mph |
The largest of the Regina singles, this 400 cc pushrod model gave the 1950s Bad Homburg range its strongest one-cylinder option, aimed at solo touring and sidecar work. It shared the Regina cradle frame, alloy hubs and four-speed foot-change box with the smaller 250 and 350, but used a longer-stroke engine and a big 18-litre tank.
