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I’m in the final decision phase of a repower of my 1989 Revenge walk through with Whaler Drive. I’m currently looking at Suzuki and Evinrudes. While I may explore others yet, I’m looking for specific feedback. I currently have twin 1989 Yamaha 150s with 13.75x17” props. Performance is great for me, with excellent acceleration and reasonable top speed for what I need.

I’m considering twin Suzuki 140s, but question whether they have enough power to get the boat on a plane with only a single running. My last outing one of the Yamahas failed catastrophically and I was able to get home quickly on plane with a single running. I will not pursue twins if a single won’t plane the boat. Who here thinks that a single Suzuki 140 could plane the boat? The literature states a 115 is all I’d need, but when fully loaded I’m concerned it won’t. Prop selection may matter here, but I don’t want such a large pitch that the boat is overly slow.

For reference, I’m also considering the Suzuki 350 duo prop, twin Evinrude G2 V6 150s, and a single Evinrude G2 250. A few others, but these are top of the list. I want to know if I should rule out the Suzuki 140s.

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I would use the search feature for learning more about the Suzuki 140 and the other brand/models. There has been some significant conversations about this topic.

My advice is compare detailed price quotes (each item listed separately) so you can compare not just the engine but the rigging, install, prop etc. There can be a significant difference in the end.

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I would do a single Suzuki 300. It will be faster than the twin 140's and reliability these days is not an issue.

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Thanks for the replies. I've done extensive research and have multiple quotes across various twin/single configurations. There's lots of disagreement on these forums on which path is better (single/twins) and I haven't yet decided. I was hoping to get some feedback, even if it's just gut feel, if a single Suzuki 140 could plane the boat with only one running. That would at least help me rule in/out that option. I could not find any posts that talked about these engines being installed in the 25' whaler drive option.

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There are pros and cons, but I would want twins on a boat this size.

But with respect to the literature you have indicating a 115 can plane the boat.... Maybe. But probably only a very lightly loaded hull. And definitely not with a second dead engine hanging on the bracket.

Even as light as the Suzuki DF140A is, having one engine out means you effectively have an 800+lbs 135-140 hp engine on the bracket. That is a very different scenario from having just a single 140 mounted back there.

In your shoes I’d be looking at higher HP twins while trying to keep weight down as much as possible. The new 3.4L Mercury V6 offerings would be my first choice.

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I don't think any model of 140hp outboard would get that hull with the W/D to plane, even if you changed props at sea.

You need to take into consideration the torque curve of a 4 stroke is not as steep as a 2 stroke or DFI.

I would not consider duo prop given lack of experience by Whaler owners.

I would stick with Mercury and Evinrude 150's. Compare pricing and rigging features. The new displays and features have a measurable impact on price and dashboard rework.

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My bud had twin 115's and recently repowered with a single 300 and would never go back to twins. He is rated at 400hp and does over 50 with the single 300.

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Repowering isn't as easy of a decision as I thought it would be! I'll post separately once the decision is made. Interestingly, the Evinrude dealer recommends I go with the 250 and not the 300. I prefer the low end torque over top end speed, and they said the two engines are basically the same but with different porting. According to them, the 300 sacrifices low end torque to get the HP up. There seems to be little info out there, but I suppose it makes sense.

I also couldn't find any info on max transom weight on the boat. The existing powerplant would be 780 lbs, but an extra few hundred lbs from modern motors may not be that big of a deal with the Whaler Drive.

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My 1992 Yamaha 150 with 25” shaft weighs 429 lbs, not including the oiling tank. Are you sure your 1989 Yamaha 150 engines are 40 lbs lighter?

If transom/bracket weight is a concern, realize that the G2 engines are usually the heaviest option in the 150-200 Hp range.

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What is the max HP for a whaler drive...450?

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The maximum horsepower rating for a Revenge 25 WT WD is 450.

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Max that puppy out with twin 3.4L V6 225 hp Merc Fourstrokes! About 475 lbs each!

It’s fun spending other people's money.

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Dear Member who wants to repower his Boston Whaler 25,

I am curious as to why you have ruled out Yamaha and Honda as viable choices in your repowering decision. I can understand why you might be impartial to Yamaha since one of your Yamaha outboards failed. Why did that Yamaha outboard fail?

Repowering is a huge decision that has many facets and ramifications. I am glad to see that you are doing your homework. First off, lets talk about the Evinrude dealer that claims an Evinrude 300 has less torque and acceleration on the low end than an Evinrude 250. When you hear a comment like that, the best thing to do is tell the dealer to pack sand or go to hell. However, you did learn something from this interaction, and that is not to use that dealer. Making a statement like that is a very stupid thing to say to a potential buyer.

The best thing to do is to analyze all of the variables involved in the equation. For example, maximum horsepower, maximum transom weight, and of course fuel consumption, all need to be evaluated extensively in order to make the repowering decision that works for you. Remember a single outboard is going to be lighter and consume less fuel than having a pair of outboards. Your boat will also more than likely be less stern heavy and better balanced with a single outboard.

Hope that helps,
Paul

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How about twin Evinrude E-Tec 200hp (last years models) on your Whaler Drive at 433lbs. each?
https://www.whalercentral.com/article...icle_id=30

Or as JRP mentions above, Mercury 4 stroke 225 at 474lbs for the 20 inch shaft.
https://www.mercurymarine.com/en/us/e...75-300-hp/

Hard to beat either one for weight using either single or dual motors.

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Paul;

I too have heard that the 250's can have more torque than the 300's, especially in 4 strokes as they are mapped different and have a lower WOT RPM. The higher HP engines make more HP but at a higher RPM than their lower HP sibling and therefore it does make sense. I can not vouch for a DI 2 stroke however as they are not on my radar.