I'm getting close to picking an engine. Four options....115 4 stroke merc or yamaha. 115 etec-1 2stroke, and even a 100hp 4 stroke honda. If you look at displacement on these the 90 hp is the same as the 115. Yamaha, merc 90 look like same engine for 115 and 90, confusing. I had a 1992 120hp force that worked fine for trolling and 20mph at 4000rpm for short runs out of owsego. Also, the oil injection for etec seems to finally perfected, unless I hear any new comments. I like the etec no break-in time and three before maintenance. For merc and yammy also like that we are able to perform our own oil changes under warranty. Any comments , especially if 90 may work instead of 115? Goodnoughs above is not listed on mercury dealer list.????