Here is another of Yamaha's ideas.......... I saw this engine at a dealer show and two people could pick it up and carry it. It would fit in a large Igloo cooler! Look at the clutch and you will get an idea of how small this engine actually is.
http://motocrossactionmag.com/Main/News/THE-MOST-EXOTIC-YAMAHA-EVER-WHY-YOU-NEVER-GOT-TO-S-8303.aspx
Tony
http://motocrossactionmag.com/Main/News/THE-MOST-EXOTIC-YAMAHA-EVER-WHY-YOU-NEVER-GOT-TO-S-8303.aspx
Tony