I have 2x 75 ficht rams, they are great, nothing but prase for evinrude, fuel consumption of a 4 stroke, with the power of a 2, and a lot less servicing. They are good on oil consumption too, and I have only seen the engines smoke once for about 30 sec. You have to use the Evinrude Ficht Ram oil in them though, this is more expencive than other oil, but it has Carb X in it to stop carbon building up
As far as I Know the early 150 and 175 gave trouble, with blown pistons, heads etc and this gave the whole range of engines a bad name, but when they upgraded the engine to FICHT RAM(2000-2001), this solved the problems.
Its very hard to find a bad report on any engine after the RAM upgrade, as I have spent many hours serching the American sites, The yanks also gave out yards about the after sales service they got from OMC.
As far as I know South Coast Marine near Bournemouth, Have a second hand one for sale, and I found Mike very helpful there, Tel 01202 482695
NOT THE SHARPEST KNIFE IN THE DRAWER