I'd think there would be a case for new bearings, rings and (maybe) valves, but as for replacing the other bits I'd reckon I'd go buy a second hand motor. The retail price for 1 conrod, with bearing shell, is around $220. Oh and they don't have any in Australia.

Ron
Mildura
GTR-AUS #20

To quote Leonie Bressanelli "It's all about the bike"