I know this is an old thread, but people seem to have this question a lot. Changing your oil is important in these bikes. Espcially since they hold so little oil. It's not difficult to change oil, so do it often. I got a reuseable oil filter so I wasn't spending money constantly on the oil filter. People say to change the air filter after every ride... why? That's excessive. Clean it when it gets dirty. Find a filter that filters properly and they only thing you will lose by running a dirty air filter is power. Make sure the filter you have filters properly, or you're adding dirt/dust into your engine. I don't see any reason why these bikes can't last a long time, if properly maintained.