Your trip looks good, at least from Naracoorte onwards. The road from Meningie to Kingston is not the best but then the alternative, via Keith (Dukes Hwy), will just about have you falling asleep. In April this year I travelled with some other members of the Triumph Riders Club to Maldon VIC for the All British Rally. The run from Adelaide to Horsham was long and straight but we took a detour via Halls Gap, it’s a great road. I’ve never done Halls Gap to Warrnambool but I imagine it would be a nice run down to Dunkeld before a flat run into Warrnambool.
Warrnambool to Melbourne via the GOR and Geelong is definitely doable in a day, as long as you know where you're going when you get to Melbourne (or have a GPS).
As far as MotoGP is concerned, I’m in the early stages of planning that now. I’m riding with a couple of other guys from Adelaide to Warrnambool (not sure which way yet) and stopping overnight. Then the next day we travel Warrnambool to Phillip Island via the GOR and Queenscliff – Sorrento ferry. One of the guys on the trip is leaving us at Torquay and heading up to North Balwyn which is just East of Melbourne.
At least one of the grandstands is fully sold out for the MotoGP so don’t leave it too late if you want a grandstand ticket or campsite.
Are you riding all the way from Perth or picking up a bike in Adelaide? There are so many trips I want to do in Oz and Adelaide to Perth is one of them. I've done it in a car a few times but would love to tackle it on the Sprint.
Triumph Tiger Explorer
Ducati Hypermotard 1100 EVO