Go look at it. Do not even bother with it if it's not truely as clean as it appears in that photo. Bring a compression tester. Check both cyls, look at the spark plugs, and check fluids. Take note on maintainence items like the chain, brakes, cables, etc. Look at the hardware on the bike, is it uniform or mis matched cobbled shit? Stuff like that will tell you what kind of history a bike really has.