This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1956 NSU Max Spezial is a largely original motorbike with 8,740 miles showing on its factory frame, 247cc single-cylinder engine, and 4-speed transmission. The seller recently acquired this example from an estate where it had been stored indoors for many years. After cleaning the fuel system, installing a new battery, and filling up the tires, the bike is said to run and drive with all systems and electrics fully functional. This NSU is located in Kansas City, Missouri and is now offered with its instruction book, an original tool kit, and clean Wisconsin title.
The Max Spezial model was produced from 1954 to 1956 and weighed approximately 165 kg. (~363 lbs.). This example is believed to retain largely original paint with some prior paintwork present on top of the front fender and headlight housing. There are scratches and flaws present as expected with a 60 year old bike, but overall this NSU presents well in pictures.
The seller has inspected the frame (#1293749), which is said to look solid and crack-free. The frame number falls in line with the 247cc engine’s stamping (#793542) according to this website, which leads the seller to believe both units are original. A photo of the engine stamping is shown in the gallery below.
These bikes featured 180mm alloy drum brakes that now work well after several shake-down rides. Non-original brake light switch and tail light wiring is present, though both components are in order along with the horn and headlight.
The functional odometer reads 8,740 miles which is believed to be correct.
The 247cc single-cylinder four-stroke engine was quoted at 17 horsepower @ 6500rpm when new, which could propel the Max Spezial to a top speed of 126 kph (~78 mph) without a passenger. After purchasing this bike, the seller cleaned the fuel system, installed a new battery, and filled up the tires. This NSU is said to start easily and run smooth with a nice engine note and positive shifts from the 4-speed transmission.
The factory toolkit appears to be complete, showing a consistent patina that matches the motorcycle itself.
The factory instruction book is also included and this bike is being sold with a clean Wisconsin title.
These NSUs have become relatively rare sights. This largely original example presents the opportunity to ride it as-is or clean it up and restore as desired.