With recent introductions of 150-hp four-stroke outboards from Mercury and Suzuki and the release of Bombardier’s Evinrude E-TEC direct-fuel-injected (DFI) two-stroke of the same horsepower, the consumer now has a choice of five different brands and two technologies of cleaner-burning engines in this size. Such a competitive marketplace means improved products and lower prices, but it also makes buying the right engine more complicated. Two- or four-stroke? Should you buy American or Japanese? And what about those Canadians with their Evinrude E-TEC? Which engine is the quietest, the most fuel-efficient, or the fastest? Are there any substantial price or warranty differences? Don’t worry. We’re here to help. …