I'm buying a new dirt bike after riding sport bikes for many years and wanted to know what type of maintenance I'm going to be doing? How often do I change the oil? Is there any engine related maintenance that I should know about? checking valves, etc, etc? Sorry for all the questions but I know with street bikes you can just get a service manual and it lists all the things you need to do or check after so many miles but I haven't found anything for this bike like that.