(http://bringatrailer.com/wp-content/plugins/PostviaEmail/images/1970_Yamaha_R1-Powered_Austin_Mini_For_Sale_Rear_Three_Quarter_View_resize.jpg)
http://bringatrailer.com/2012/12/14/11500-rpm-yamaha-r1-powered-1970-mini/ (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 (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...
That looks like loads of fun to drive.