For motorcycle enthusiasts who want it all, their collection isn't complete until this monstrosity makes it into the garage. It's powered by 24 chainsaw engines (170ps / 400Nm), mated to a 5-speed Harley-Davidson gearbox using a series of 12 toothed belts.

Source- http://www.techeblog.com/index.php/tech-gadget/feature-chainsaw-powered-motorcycle-is-functional-pretty-fast-video-