I just did this conversion on my son's ATX. Wow, these new parts have some serious compression. I am only 2 tanks into the breakin, but what an easy conversion. I had no idea these motors were so easy to work on. My only concern was whether or not I got the mesh correct between the spur gear and clutch bell. Anyone have a simple guide I can follow? It looks correct, but I am not sure I would really know.