sorry to hear you are having troubles. i too have been down that path.
i had most of my warranty work done through Sutto's at Penrith. never had any problems there (getting warranty that is).
i too came to the conclusion that one problem leads to another, as other people seem to get reasonable reliability out of these engines. i didn't, so i changed. $h!t happens. Husaberg Oz made no attempt to make amends, and why would they since i end up buying 2 new KTM's since anyway??? its still a win situation for them.
hope you get it fixed, i think you have a fair case. realistically, if they don't want to pay the warranty they shouldn't sell bikes that have problems in the first place. you certainly have not done excessive work at 60hrs. i did 180/12months and the bike spent about 3 months of the year in the shop getting fixed!!!!
my advice would be to put a few $$$ in the dealers pocket and get him to replace other problem parts whilst the bike is pulled down if you get warranty. take advantage of the free labour.
also, if the dealer is half switched on, all they have to do is send in the warranty claim with the VIN of a newer bike. Husaberg Oz don't check them, and it would make everyoen happy right?
Have Fun
Jeff