I welcome your post because I am also looking for opinions. I read the subsequent posts and was hoping to see a little bit more about Mercury Motors, but nothing so far.
For those that talk about adding oil, forget it. The Two-stroke E-TEC has a seperate resovoir and for most of us one fill and it will last most or all of the year. The oil thing simply is not an issue with the modern two-strokes.
BPR has put out two videos explaining why the E-TEC is better, in literally all respects then a four-stroke.And it is worth a look, but remember it is an ad.
I have owned a 90HP E-TEC for two full seasons and my son also purchased a new E-TEC this spring. Shortly after buyng the new E-TEC he traded it in on a four stroke, while I still own my E-TEC and in most respects am still happy with it.
Following are the reasons why I atill own an E-TEC and he is much happier with his four-stroke Suziki, along with comparisions of both motors.
1. Gas mileage with both motors is good, but the E-TEC is clearly better.
2. I use my E-TEC for trolling and it has never been a problem. However, the kid trolls for hours on Lake Michigan and the plugs on the E-TEC would carbon up. The only solution, replace the plugs a few times a year.
3. The four-stroke is quiter regardless of the BPR promos. At higher speeds this becomes very apparent.
4. What suprised me is the four-stroke Suziki, although slower out of the hole, is every bit as fast on the top end. Now the kid knows tons more then I do about this stuff, and actually took his Alumicraft back to St. Peter to have the engineers make some changes in the boat, but the bottom lne is this four stroke is every bit as fast as my E-TEC. As for the Alumicraft folks they were just super.
5. The E-TEC require much less maintenance, and in the long run this will save you $$$. i have a seven year non-depreciating warranty, and I doubt that is available with the four strokes.
6. The tilt/trim does not hold on some E-TECS built on or before March, 2006. My son’s was replaced and mine is currently being replaced under warranty.
On balance, I am sticking with the E-TEC because it runs great, trolls nicely for me, starts even faster then a four-stroke, requires virtually no maintenance and has a great warranty. However, as noted above there have been some problems and the four-stroke Suziki has been a great engine for my son.
Unfortunately, I do not have enough personal expeience to comment on Mercury or Yamaha.