Deadeye,

I have replaced the bearings on my Saito 50 before and it required tearing it down pretty much since I had to boil the engine housing to get the bearings out. I did this more than 6 years ago but I think it was pretty straight forward. Just make sure to either note how things line up or put a small mark in the components so you can line things up as close as possible to how they were when taking in a part. If you can get the parts you can do it I would think.

Marcel.