Some one on here or over at .org has a tiger 80 with no motor. Here is a 1986 ktm 80 parts bike. It may be worth an email to see about the motor.
I really want to see one of those things screaming by at 14,000 rpm or whatever scary number they red line at.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=35622&item=2463413 185