1) Pull the side fairings off and check for:
wiring issues- most common areas to look at are front and rear turn signals.
etched glass in the oil sight glass-means oil change intervals were not done properly or old oil sat in the crank case over extended periods of storage.
oil leaks, while the RC is not prone to leak fluids, its still a safe bet to check.
Check the oil condition itself, give it a sniff test for excess gasoline.
2) Remove the rear seat, cowl cover:
Inspect the wiring, most common area for people to butcher the wiring.
make sure relays are mounted properly, not laying in the trunk area. Not overly important but gives you an idea of how well the previous owner cared for her.
3) Chain and Sprocket
Condition of wear/alignment
check for oil leaks around the drive shaft where the front sprocket mounts. No way to change this seal without splitting the cases.
Ask the owner the last time they had the for oil changed
Junk the rear shock unit for a good aftermarket unit. (Penske, Ohlins, Elka) Tyr to find a unit that already has one!
5) More fluids:
Brake and clutch systems- good color, not gummed up. Lever should move free, no catches or "bouncing"
6) Steering head:
Bearings are know to be a weak spot on the RC, make sure the steering is smooth and not "catchy" or interrupted.
Under tail tidy
If you find a unit to with these on it, its probably going to be a keeper.
Keep adding to this folks, we may want to keep this as a sticky somewhere for the rash of new owner we will be seeing as the weather gets warmer.