Re: Upgrading 150 2 stroke to 200 4 stroke, which is best
Although the majority of the pople in this forum guide you towards direct injected two stroke engines, I would take more serious informations from european outboards forum (for example Italina or German), because there are no outboards manufacturer in Europe, so I think there you can find far less lobyst. In every test of outboards (from european marine magazines), 4-strokes especially from Suzuki and Honda wins.
My choice according to european magazines would be between Honda BF 150 VTEC (engine from Honda Accord Type S(port)), and Suzuki DF 150 or 175. All of them are 4 cilinders engines, the best in class (very very silent, no vibration, very fuel efficient...). Among 200 PS class, the choice would be among Suzuki DF 200-250, Honda BF 225 VTEC or Yamaha F 250.
Difference between DI two strokes (Mercury Optimax and Evinrude E-tec) and 4-strokes is not so big when you look at the numbers (sound in db, gph...), rather it's subjective (men like the sound and refinement of four strokes).
I had an opportunity, in last couple of years, to try the majority of outboards, so my opinion comes from my own experiance.
As the final argument, in europe 4-strokes holds almost 90% of the market share.