Franz Langer held the record for the largest displacement single cylinder motorcycle engine, with a 1000cc thumper built in 1998. Not long afterwards, Werner Dienstkrad built a 1440cc steampunk motorcycle designed after a comic strip creation, which we mentioned on The Kneeslider in this article last year. Franz wanted the record back so he built the NSU Bison 2000, a 2000cc single cylinder motorcycle. This bike's been around for several years but it's still pretty interesting.
He started with an NSU Konsul, which displaces 500cc then tossed the original cylinder in favor of something from a radial airplane engine. The new cylinder was still far below what he was looking for so he raised the displacement to a full 2 liters. After much modification of the original engine to accommodate the huge new cylinder plus a new lighter Mahle piston and 75mm diameter exhaust, the engine was done
The big thumper only has a kick starter, (..., right) but push starts seem to work better. Probably a real smooth runner.
Thanks for the tip, Tim!
Photos and links below:
Another oversized engine: 410 cubic inch V-twin
UPDATE: 3000cc Single Cylinder Motorcycle!