| MODEL | NSU 351 OT 1929 - 1930 |
| Year | 1929 - 1930 |
| Engine Type | Single cylinder, 4 stroke |
| Displacement / Capacity | 331 cc / 20.2 cu in |
| Bore X Stroke | — |
| Compression Ratio | — |
| Cooling System | Air/Oil cooled |
| Max Power | 9.2 kW / 12.5 hp @ 5020 rpm |
| Max Torque | — |
| Ignition | Magneto |
| Induction | — |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Gear driven oil pump |
| Gear Box | 3 Speed |
| Clutch | — |
| Final Drive | Chain in oil bath |
| CHASSIS SPECS | |
| Frame | Steel, double pipe |
| Front Suspension | Spring loaded fork |
| Rear Suspension | — |
| Front Brakes | — |
| Rear Brakes | Internal shoe |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | — |
| Rear Tyre | — |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | 105 km/h / 65.2 mph |
The 351 OT is a bored-out, stronger development of the OSL range, with the same suspension as the 251 OSL. It suited hilly country and passenger or sidecar use, and was known for modest fuel use and a fair price.
