Corrosion seems to be the major issue I've seen. The frame can flake paint on the engine mount tubes under the rubber bungs and bolts/spokes exposed to road crap dont take much to give up plating /tarnish. Mechanicals on mine :- had an oil leak from the clutch side engine cover fixed under warrenty and the rear shaft seems to have a bit of play but the dealer insisted it was within spec. Other problem? back tyres dont seem to last long, even the K60 is well worn at just over 4k miles probably got 1k more left before it is on the limit in the center bar, though it does see a lot of TC light action (wet or dry).