The NSU Maxi Type 175 OSB was launched in 1957, developed from NSU Superfox. The single-cylinder four-stroke engine developed 12.5hp delivered via a 4-speed gearbox giving a claimed top speed of 110 km/h. Almost 31,500 Maxis were built in Germany by the time it was discontinued in 1964. The Maxi was also built in Yugoslavia under licence by NSU-Pretis of Sarajevo.
Production: 1957-1964
Units built: 1957: 5000 -
1958: 1189 - 1959: 1854 - 1960: 3067 - 1961: 4460 -
1962: 2401 -
1963: 7500 - 1964: 6000
Engine: 1 cylinder four-stroke,
dry sump with external oil tank and Micronic paper oil
filter
HP: 12.5 at 6500 rpm
Engine displacement: 174cc
Bore: 62mm
Stroke: 58mm
Piston to cylinder wall clearance:
0.05 mm
Compression ratio: 7.5:1 max. 7.9:1
Ignition timing: 5.5 mm or 32 deg. before Top Dead Center (TDC) with mechanical spark advance
device in full open position
Spark plugs: W 240 T1,
gap: 0.6-0.7 mm
Valve clearance (cold engine,
piston in UDC, both valves closed): Intake valve: 0.08 mm, Exhaust
valve:
0.08 mm
Valvetrain: OHC, camshaft driven
by Ultramax rods, hairpin-style valve springs
Carburetor: Bing 2/22/27 main
jet:85, idle jet 35, needle jet 2.66, needle 2nd groove from top,
idle
screw 1.5 turns open
Transmission: 4 speed
Frame: pressed steel
Brakes: 140 mm drum brakes
Tyre size: 3.25-18"
Weight: 124 kg
Length: 1997 mm
Max all-up weight: 293 kg
Fuel capacity: 10.8 ltr
Oil tank capacity:1.4 ltr, summer: SAE 20, winter: SAE10. Change every 2000 km. Let engine idle
long enough to pump the oil up into the oil tank, then check the dipstick)
Fuel consumption: 3.2 to 3.5
ltr/100 km
Top speed: 110 km/h
General information: The Maxi has many features of the Supermax ("little sister of the Max"),
although the design is actually an improved Superfox design.
Wiring:
A: generator
B: ignition switch board
C: battery
D: headlight bulb
E: parking light bulb
F: taillight bulb
G: brake light bulb
H: generator control
bulb
I: speedometer bulb
L: headlight dimmer switch
M: horn actuator
N: horn
O: brake light
switch
S: spark plug W240T1
T: negative ground
U: fuse
a: black b: red c: brown d: yellow e: white f: blue g: green
Source: Hartmut Schouwer
