I know pretty much anything is possible, but was just interested to see what the most common transpants are. Im guessing wr 200 swap would be the easiest. I was just looking on ebay, and someones fitted a a 1986 yz 125 engine into a dt, looks like neat swap.. :http://cgi.ebay.co.uk/DT-YZ-125-OFF-ROAD-BIKE-SCRAMBLER-SPARES-REPAIRS-/250696032765?pt=UK_Motorcycles&hash=item3a5ea5e1fd