emu
German Motorcycles

NSU 201 OSL, 251 OSL, 350 OT


NSU 201 OSL


Production: 1933-1939
Units built: 18111
Engine: 1 cylinder four-stroke, dry sump oil circulation
HP: 1933-1935:8.0 (4100 rpm) 1936-1939:8.5 (5000 rpm)
Engine displacement: 198 cc
Cylinder diameter: 58 mm
Piston stroke: 75 mm
Compression ratio: 7.0:1
Valvetrain: OHV; two pushrods in one tube: only looks like a vertical bevel drive shaft driven valvetrain!!!
Carburetor: AMAL 4/017, GRAETZIN KE 20 or BING AJF 2/20
Transmission: 1933-1935: 3-speed, then 4-speed
Tire size: 3.00-19"
Weight: 120 kg
Length: 2000 mm
Gas tank volume: 11.5 ltr
Top speed: 90 km/h
General information: closed and fully sealed cylinderhead introduced in 1938 (until 1937 the valve springs etc. were fully visible)

NSU 251 OSL

Production: 1933-1940 and 1947-1952
Units built: 1933-1940:34977 1947:58 1948:667 1949:4849 1950:10442 1951:13570 1952:2879
Engine: 1 cylinder four-stroke, dry sump oil circulation
HP: 1933-1934:9.0 (5000 rpm) 1935:10.0 (5000 rpm) 1936-1940:10.5 (5070 rpm) 1947-1952: 10.5 (5000 rpm)
Engine displacement: 242 cc
Cylinder diameter: 64 mm
Piston stroke: 75 mm
Compression ratio: 6.2:1 max. 6.8:1
Valvetrain: OHV; two pushrods in one tube: only looks like a vertical bevel drive shaft driven valvetrain!!!
Carburetor: BING 2/22/16; pre-WW2 models with AMAL 4/017, GRAETZIN KE 20 or BING AJF 2/20
Transmission: 1933-1935: 3-speed, then 4-speed
Tire size: 1933-1949: 3.00-19", then 3.25-19"
Weight: 126 kg
Length: 2000-2040 mm
Gas tank volume: 11.5 ltr
Fuel consumption: 2.7 ltr/100 km
Top speed: 95-100 km/h
General information: closed and fully sealed cylinderhead introduced in 1938 (until 1937 the valve springs etc. were fully visible)

NSU 351 OT

Production: 1936-1939 and 1950-1951
Units built: 1936-1939:2803 1950:305 1951:150
Engine: 1 cylinder four-stroke, dry sump oil circulation
HP: 12.5
Engine displacement: 331 cc
Cylinder diameter: 75 mm
Piston stroke: 75 mm
Compression ratio: 6.3:1 max. 6.5:1
Valvetrain: OHV; two pushrods in one tube: only looks like a vertical bevel drive shaft driven valvetrain!!!
Carburetor: BING 2/22/16; pre-WW2 models with AMAL, GRAETZIN and BING AJF 2/20
Transmission: 4-speed
Tire size: 3.25-19"
Weight: 130 kg
Length: 2000-2040 mm
Gas tank volume: 11.5 ltr
Fuel consumption: 2.7 ltr/100 km
Top speed: 105 km/h
General information: closed and fully sealed cylinder head introduced in 1938 (until 1937 the valve springs etc. were fully visible)

Information supplied by Hartmut Schouwer

Melbourne Motorcycle Workshop
Melbourne Motorcycle Workshop
Dyno Tuning, Performance Enhancements, Sports Bikes and Offroad. Rebuilds, Race Preparation and Classic Restorations.