Back in the 80's OMC came out with some weird horse powers and yes 185 was one of them. They did not last long, I guess it didn't catch on?
I don't know much about them but I bet they are just a regular horse power motr with a few carb mods to change the HP.
IBoats have some info
http://www.iboats.com/Johnson__185TX.../bpe/56e2850r2