Any one know anything about this? What mods need to be done to the engine to get it to work? Saw it on another site and now it has my interest. http://cgi.ebay.com/ebaymotors/xr650l-honda-big-bore-kit-720cc-1993-to-2005-FREE-SHIP_W0QQitemZ200200109249QQcmdZViewItem Found it at SMJ. The case's have to be clearanced. I wonder if the 700cc kit has to be done the same way. I'm pretty sure the 675cc doesnt.