RE: Stihl 27cc conversion ?
been ages since i've seen one so i'm not really sure about the mounting but i think it is similar what's found on all the japanese motors...a little bell housing that contains the pull starter. makes for a nice radial mount.
the echo 30cc saw engine has beam mounts and rear exhaust but the carb is mounted on the bottom of the crankcase. very light and would be nice on a big profile plane
dave