I'm using the O.S 200 FS in my new Lorenz Laser. See
http://jonwold.blogspot.com
I'm currently mounting the engine and hope to break it in soon.
This is the unpumped version.
Ola Fremming has an EFI in an Oxalys, see
http://home.online.no/~ofremmi/F3A/T..._fs_200_fi.htm