K75 Information and Specifications
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The K75 weighs 700 lb. empty with the attached sidecar, has a large frontal area and is
powered by an old fashioned 749cc engine, it is not a speed demon. The K75?s
top speed is 60 mph BUT only after faithful adherence to the break-in period .
If you are a vintage enthusiast, collector, local commuter, hunter, fisherman, have
children, grandchildren or dog that likes to ride, or you just like to putt around on a
rig that draws an instant crowd wherever you park, welcome aboard!
The classic boxer twin has a German heritage. So effective, simple and powerful is this
design that Porsche, Volkswagen, and even Harley (during the war with the XA model) made
this design their choice. The reliability and torque of this elegant motor is due to its
original design in 1912 by Max Friz, a brilliant German aircraft-engine builder. He
devised a compact and rugged engine that delivered significant torque for its
displacement, at low and constant rpm?s, without the gyro effects of other twins. The
military and civilian uses became legendary. The German motorbike builder BMW, began using
the design in their motorcycles in 1922.
Because of its opposed cylinder layout the "Boxer" as it was dubbed, turns
the crankshaft in line with the motorcycle (or airplane!). This allows for a
straight-through shaft connection from the engine, through the gearbox and through a steel
driveshaft to a rear wheel final drive gear in the wheel hub. This drivetrain design is
exactly like the millions of rear wheel drive automobiles built over the past eighty
years. It is a time tested, proven drive system made elegantly simple by the
"Boxer" opposed cylinder engine.
Today the "Boxer" engine has evolved into the high tech and electronically
sophisticated and complicated versions that can be found not only in BMW?s, but also
in Porsches, Hondas and others. These are wondrous engines at wondrous prices! But
they still retain the basic "soul" of Max Friz's first engines. Although it is
not as evolved as the most modern "boxers", the K75 is true to the earlier
versions in looks. It also has many modern internal components. These parts make the
engine more reliable and cleaner.
The "boxer" is still an air/oil cooled power plant. As such it must be
carefully monitored during operation to prevent overheating. A careful break-in of the
engine is very important. Neglecting to follow the prescribed speeds during break-in or
the frequent oil changes will cause this wonderful engine to rebel against its
"abusing" owner. However, by treating the "boxer" with respect and
raising it well, you will be rewarded!
SPECIFICATIONS
Dry weight with sidecar 350 Kg.(770 lbs.)
Max. load with sidecar 3 persons + 100 Kg.(225 lbs.)
Fuel type regular
Top speed sidecar 80 Kph(50 mph),90 Kph solo (55 mph)
Fuel consumption sidecar 6 liters per 100 Km (40 mpg)
Engine 4 stroke, twin cylinder, air cooled
Bore x stroke (mm) 78 x 78
Capacity (cc) 746
Compression ratio 6:1
Max power h.p. @ rpm 23.7 @ 4200-4800
Starter electric + kick
Carburetors PZ24 X 2
Clutch dry double disc
Drive shaft with u/v joint
Transmission 4 forward gears 1 reverse
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