If you've got the Rider's Manual, just go down the list of scheduled maintenance. Clutch spline lube should be your top concern. It will require major disassembly. Next, is all the rubber parts in the fuel injection system, as long as you have it all apart for the spline lube. Consult the online MAX BMW Parts Fiche to visualize the various systems and subassemblies. Find a used Clymer's shop manual on ebay.