In 1926, private driver Franz Islinger from Mannheim won the German motorcycle championship in the 250 cc class with the NSU 251 S. Modifications to the standard 250 cc engine on the connecting rods, pistons and cylinder converted the side-valve touring engine into an overhead-valve sports engine producing more than 60% greater power. Other advantages were lower weight of the oscillating control organs. That was especially important for high-revving engines.
Engine: 1-cylinder, 4-stroke
Displacement: 247 cc
Power: 16 hp at 4,400 rpm
Maximum speed: 100 km/h
Series: 1926-1929
Displacement: 247 cc
Power: 16 hp at 4,400 rpm
Maximum speed: 100 km/h
Series: 1926-1929
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