At the age of 12 Bruno Rossati began working eleven hour days.
"Now, approaching 91, I find myself reminiscing about my youth, still riding my motorcycle every day.
Letter re Ladetto
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
