German Motorcycles


NSU LogoNSU Fox 4-stroke (Type 101 OSB)

NSU Fox 98cc Fourstroke.jpg
NSU Fox 98cc Fourstroke


Production: 1949-1954
Units built: 1949:6636, 1950:19199, 1951:14000, 1952:6059, 1953:6712, 1954:6520
Engine: 1 cylinder 4-stroke
HP: 6 at 6500 rpm (1952+: 5.2 HP)
Engine displacement: 98 cc
Cylinder diameter: 50 mm
Piston stroke: 50 mm
Compression ratio: 7.2:1, max. 7.8:1
Valvetrain: OHV
Carburetor: BING 1/14/6
Transmission: up to 1950: 3-speed, then 4-speed
Frame: solid NSU sheetmetal frame
Brakes: 125 mm drum brakes
Tire size: 2.50-19"
Weight: 80 kg
Maximum weight: 230 kg
Length: 1910 mm
Gas tank volume: 8.2 ltr
Fuel consumption: 1.8 ltr/100 km
Top speed: 85 km/h
General information: Crankshaft main bearings only on one side of the crankshaft. Pump-less oil system. First post-WW2 design by Albert Roder; later he designed the reliable hi-tech ULTRAMAX valvetrain of the Max, Superfox, Maxi and NSU Prinz (2-cyl. car)

Original article by Hartmut Schouwer

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