BAT R1 Mini

[Mudhen]

http://bringatrailer.com/2012/12/14/11500-rpm-yamaha-r1-powered-1970-mini/

Lots of videos on the ebay auction:

http://cgi.ebay.com/ebaymotors/Pro-Motive-Yamaha-R1-Motorcycle-Motor-11-500RPM-/170952507667?item=170952507667&ViewItem=&forcev4exp=true

Never been much of a fan of conversions like that, but man...

[Willie_B]

That looks like loads of fun to drive.