MEGA
(http://www.mega-kart.com/imagebrowser/ib_p002_1_1.jpg)
http://www.google.com/search?q=mega+kart+engine&sourceid=ie7&rls=com.microsoft:en-us:IE-Address&ie=&oe=
The most amazing are the 250cc 90hp single and twin cylinder superkart engines
(http://www.roadandtrack.com/var/ezflow_site/storage_RT_NEW/storage/images/media/images/superkart_lead1/1707810-1-eng-US/superkart_lead1.jpg)
http://www.roadandtrack.com/racing/motorsports/superkarts-super-speeds
PDF broshure 90+hp
http://www.google.com/url?sa=t&rct=j&q=brc250fe&source=web&cd=4&ved=0CDkQFjAD&url=http%3A%2F%2Fwww.brceng.com%2Fpdfs%2FBRC250FE_Tech_Data_Sept05.pdf&ei=swdXT-GtLoLY0QHgwbjKDw&usg=AFQjCNEVdRbr7SJAhiP6krViR5scj-uVow
Yes, with all the GP-Bikes tracks it would be amazing to see them one day in KRP. :)