I've been looking around at 8th scale buggy motors, and found this on the O.S. website:
http://www.osengines.com/engines/osmg2055.html
I've heard of the RG, but not the RZ. I looked around online, and couldn't find one for sale. Is this an old outdated motor that dissappeared, or something new and yet to be realeased? It doesn't say on the site... It has some kind of neato fuel pressure system, kinda like the high performance 4 strokes for airplanes.