other than regular maintenance and replacement of normal wear items such as tires, brake pads, chain & sprockets, battery, the bike runs perfect and has never let me down.. at 100k miles I'm knocking out a yearly average of 46 mpg. (see fuelly link below) and the inside of the air box is clean & dry. in addition, I'm still running original stock bearings, suspension, brake rotors, fuel pump & filter, clutch & basket, and a 07 pure stock ECU. i give this bike a grade of A+ .. undoubtedly the best bike ive ever owned. IMHO, i contribute my good luck to, 1. the OverDrive Trannie, for 30% less wear & tear on engine. 2. the use of mc specific motor oil. 3. use of regular automotive grade fuel with the highest AKI rating. 4. street use only. no dirt or trails.