the problem with the rings on some 08-09s is that if you have a bad one, it will drink oil sometimes to the point of starvation. if you run too low, the exhaust cam starves (last place to get oil).... if that happens the head is shot. there has been more than a few of these (but remember they made thousands). Kawi was doing warrantee work on some but now we're talkin 4-5 years ago.
at the first sign of high oil consumption it's time to change the piston because it will get worse, not better. in fact, I'd change the piston given any excuse since the bike runs smoother & stronger. the 1st generation piston rings are no longer available, so when the older bike needs rings you need a piston too. the aftermarket ones are better
700 miles you say..... total miles??? weren't near as many 09s with bad rings, but a few early ones
the carb is ok down to anything you care to drive in.... I've run mine at temps below zero F