Hi there. Well as with most Australian built stuff there isn't really a repair manual. some had user manuals in the parts list but thats about it. Is there anything in particular you need to know about it?
they are very basic, pretty easy to fix. Looks very tidy to start with!
Carb tuning is easy, permitting there isn't something wrong. For a start i would ask why you are trying to tune it. has it been cleaned? if all is clean you know its good, bottom mixture screw (under the bowl) is high speed (full revs) there is another mixture screw on the top, you have to remove the air filter, it is low speed, then you're idle speed is on the throttle shaft. start high, then do low, then adjust idle to suit.