In this video I disassemble an OS Engines FS-52 four stroke. It's narrated. At the end, the front bearing doesn't come out and I would normally push it out with the shaft in the clip in a press.
Reassembly Part 1
http://www.youtube.com/watch?v=2WO9LRBIc_g
Reassembly Part 2
http://www.youtube.com/watch?v=8FoLT8VjKqE