just scrollin through some recent news and i saw this it about blew my mind take a look here is the article and video, 2 stroke technology ftw
http://twostrokemotocross.com/2012/06/fuel-injected-500cc-two-stroke-yamahonda-in-nz/
http://twostrokemotocross.com/2012/06/fuel-injected-500cc-two-stroke-yamahonda-in-nz/