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While that little 2L Suzuki 140 might make close to 140 HP at WOT, it won't have anything close to the low and mid-range torque that your Evinrude 150 has. It will be much more than a 10 HP at WOT step down. In the mid range, it might be as much as a 50 HP step down.
I had the e tec 150 installed this year on my 1983 18 foot outrage. Burns 4.6 gph at 3600 rpm light chop. Top speed has been 47 by gps and there was room left to go! I would go with the 150 for sure. Take a look at my boat profile and the pics show it sitting in the water. Its not to heavy. I bought mine as a demo with 80 hrs for 7500.00
Pictures tell a great deal as well as the HIN and Stencil #. I stil say if you go with the Evinrude, you can use the rigging that you have in the boat and save $$$$'s. Going with less HP,you may have to add trim tabs to help get on plane and hold it there because of the weightof the live well and its assorted stuff. WATER IS HEAVY,comp to fuel and oil. Trim and stability is key here,where you place stuff in the boat plays a roll. There is a member here that has a 50 HP on his and does what he wants it to do.
Now that we know this boat is not the second generation Outrage 19 II, I can tell you the difference in single engine weight between an E-tec 150 or the new Mercury 150 EFI 4-stroke, is totally insignificant. The weight difference is about the same as a filled 3 gallon 2-stroke oil tank, or of a starting battery. The 4-stroke will not need the oil tank, so the true weight difference is nothing.
The Outrage 18 was designed to carry twin 2-stroke engines weighing 250-300# each, along with a battery in each stern corner. Any new 150HP 4-stroke engine, Verado 150 and lighter, can easily be carried by the hull, and weighs less than twins. On my own, with twin Mercury 90's each weighing 305# dry, mounted on 10" setback jackplates, and with dual batteries in the splashwell, there is no issue. Actually, the boat rides better than other 18's I have been in with a lighter single on them.
