it sounds like the end of the variator has fallen off .you need to undo the bolts around the edge of the transmission cover on the left side of the engine where the kickstart is and have a look in there ,the variator is the round thing on the left the nut in the middle has more than likeley fell off it needs doing up tight and loctite applying to the threads to stop it doing it again.ps dont touch the kickstart lever leave it alone dont unbolt it.
adam bike doctor(of milton keynes motorcycle centre)
July 2011