RE: Stihl 65cc 4-mix on 30% Edge
drdrain,
I've been on stihlusa.com and have not found any animation or other that explains that their 4-strokes work that way. I know exactly the principle you are talking about, and I believe a European engine manufacturer made a 4-stroke using this principle. The particular engine in this thread does not look like it operates that way, I mean, the carb. is attached on the head, not the crankcase, and there is no visible manifold running from the crankcase to the head.
Ig you have a link you can post, I'd be more than happy to look into it.
DKjens