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I am looking to repower a 1990 25' Revenge Walk Thru Whalerdrive. The boat is currently rigged with the original 1989 2-stroke counter-rotating Yamaha 150s. Great motors, but they have lived their useful life. They are 20" shaft motors as Whaler recommends 20" for a dual motor set up on the 25' Revenge WT/WD. Here are my questions:

1. Does anyone produce a 135-225 hp 20" shaft motor that has a counter-rotating option? I am really trying to stay with a dual motor Yamaha or would consider ETECs. From my quick research it appears that the counter-rotating options are only on 25" shaft models.
2. How much of an impact on handling would it be if the boat were rigged with non-counter rotating motors?
3. Could I rig with 25" shaft counter-rotating engines? Besides the obvious of drawing more water, only other cons?
4. I am concerned about weight of newer heavy 4-strokes. The Yammies weigh ~ 410 a piece, so I am trying to keep the option as lightweight as possible.

I am thinking it may be best to try and locate a used set of mid/late 90s Yamaha 150hp, 20" shaft, counter-rotating motors, but would imagine not many of those exist?

Thanks for your time

- Tom

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I know you prefer Yamaha or Etec, but it appears that Suzuki may offer the inline 4 200hp in counter-rotation. I would assume they also offer 150-175 as such, it's the same block. So that said, you may want to up the HP, especially with the four strokes. I think 400hp is max for 25' Whaler Drive.

Suzuki website is unclear, but they do have a test for a 26' Yellowfin with twin DF200DPL (L indicating 20") shaft. See http://www.suzukimarine.com/Product%2...20DF200APL

Weight is 498 lbs each, so you're adding 180 lbs. Not insignificant, but not out of the realm for a 25' Whaler Drive, in my opinion.

Hope this was helpful. Good luck!

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Tom -

Have you already looked at the Mercury Fourstroke 150? It's only 455 lbs.

Can't tell if they offer CR models as their website is pathetically thin on real specifications.


Aside- Assume the trees are changing and cruise ships are everywhere right about now.

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The Merc 150 Fourstroke would be an ideal candidate if it were available in CR @ 20" shaft length.

Unfortunately, the brochure on Merc's website only shows a CR in the 25" shaft. Still, I would call Merc and confirm. If by chance the CR is available in 20" shaft, it would be an easy decision.

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You have wrong information regarding twin engine shaft length on ANY Whaler Drive boat, and it appears your boat has been setup wrong in the first place. All WD boats require 25" engines, which was the whole reason for bringing out the WD in the first place - to accommodate Counter rotation engines, only made in 25" length. The cut transom Outrages/Revenges could only accommodate 20" twins. The Boston Whaler catalogs of the time clearly indicate this, and show 25" engines in the catalog photos of WD boats.

If your boat has counter rotating 150 Yamahas in 20", somebody swapped out a CR gearcase, since you could not buy them that way from the factory.

A friend has a 1990 25 WD Revenge Walkthrough, and it is rigged with twin 1990 Merc 200's, 25" length, counter rotating, bolted up in the fifth holes. OMC and Yamaha engines only had 4 sets of holes, so with those the fourth set of holes is used to get them up as high as possible. If you are buying new twins, be sure the brand has 5 sets of holes like mercury has been doing all along.

Only the cut/notched transom 25's used 20" twins. The introduction of 25" CR engines by all manufacturers around 1986 caught Whaler off guard, with no boats to accommodate them, hence the WD offerings in 1987.

My full transom 25 Outrage uses 25" CR Merc 200 EFI's also. See personal Website link.

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Finnegan: great info, thank you. You are correct, I do in fact have 25" shafts on my 1989 CR Yamaha 150s. I am leaning towards CR ETEC 150s @ 418 lbs per motor.

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The 25" G1 Etec 150 uses a heavier "offshore" gearcase than the streamlined "Lightning" gearcase used on the 20" version. So the dry weight of the G1 Etec 150 25" shaft engine is over 430lbs, and that does not include the weight of 3-gallons 2-stroke oil and the tank with its rigging. So operational weight is more in the neighborhood of 450 lbs.

If you are going with 150s, the 25" Merc 150 Fourstrokes will be within about 15 lbs of the G1 ETEC, and will simplify rigging as well as free up storage space no longer taken up by the 2-stroke oil tanks. Not to mention they are quite a bit cheaper to purchase (unless Evinrude is deeply discounting the G1s now?)

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Not offering an opinion but.........what is the reason for counter rotating motors with a two motor set up? Is one engine clockwise rotation and the other counter clockwise? Does it matter which side of the vessel how/where the motors mount? Any affect on downvision/fish finding mounting? In the past I remember reading setting up the linkage with certain degrees for performance. I am interested in learning.