Great 2 disc DVD that cover completely stripping down and rebuilding your engine from scratch to firing it back into life!  Presented in an easy, scooterist friendly wasy by the great sausage of Sausagespeed (RIP), he goes through topics step by step explaining things as to why we need to change part and includes top tips and alternative methods to get jobs done.
 
2 discs, approx running time 400 minutes