I've seen the inverse of this: a Harley converted into a chain saw. This showed up at a lumberjack competition (common events in Alaska where I'm from) as some sort of half-time entertainment. They'd replaced the rear wheel of some huge HD, attached a massive chain blade instead, and put four handles on it. It ripped through a 5' diameter tree in about 30 seconds. Thankfully it wasn't any longer or the entire audience would have suffered permanent hearing damage.