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Author Topic:   1998 Conquest 23 Repower
structed posted 02-11-2012 02:20 PM ET (US)   Profile for structed   Send Email to structed  
I have the opportunity to purchase a used Conquest 23 and have a couple of questions regarding the repowering of this boat. The boat currently has 2 150 hp Mercury EFI engines on it and I am thinking of replacing them with a single E-tec 250. Does anyone know the transom height of this boat; also what would be a good propeller, brand and size, to use; and finally, if anyone out there has performed this conversion what are your thought. If anyone has the specifications for this boat could you make them available? Thanks for you help.
jollyrog305 posted 02-11-2012 06:13 PM ET (US)     Profile for jollyrog305    
What is/Is there anything wrong with the motors currently on the boat? Having a dual setup does have its benefits. Here is some info for that year - http://web.archive.org/web/19980206042106/http://www.whaler.com/recreation/conquest/conquest.23.html
structed posted 02-12-2012 12:06 PM ET (US)     Profile for structed  Send Email to structed     
I agree that the twin motors would be an asset, however, I am not comfortable using 14 year old engines that have had questionable maintenance over the years. Replacement with twins is cost prohibitive and I have the opportunity to get a left-over etec at a substantial discount from msrp.
Peter posted 02-13-2012 10:56 AM ET (US)     Profile for Peter  Send Email to Peter     
If you repower with a single outboard, you will need to add lead ballast to the stern as Whaler did for Conquest 23s that were originally powered by a single outboard.
tom976 posted 02-13-2012 11:31 AM ET (US)     Profile for tom976  Send Email to tom976     
I was faced with a similar question a few years ago when I bought my 23' Conquest. I have a single 225 ox66 with unknown hours and iffy maintenance. So here is what I did.... I went over the motor from top to bottom. I found a few problems and fixed them. Overall, she's been a good motor. No real major issues. Only time I got stuck in the water was because of water in the fuel.

If I do get stuck... I pay my dues with Seatow just in case. I dont go off shore 50 miles out. For the most part its 10 miles or less. Anything further out I would want a pair of twins in the rear. When going out far, its always better to limp home than float away. :)

There is something to be said about getting a new motor and the warm and fuzzies about its reliability.

As for the weights being needed in the back on a single... Its a Yes and no. I dont have the lead kit in the back. It was a kit they made later on and installed if you complained enough. Its still 400lbs of lead! While I would like a little more weight in the rear for when the boat is at rest, its not horrible. As for being bow heavy under way? I put trim tabs on the boat last year. Worked out great. I would have loved to went larger that the factory default size, but going too large is a problem with the usage of the swim ladder.

I believe the twins you have a 25" My single yamaha is 30" Speed wise, I get around 38-42.

What year is the boat?

structed posted 02-16-2012 11:53 AM ET (US)     Profile for structed  Send Email to structed     
The boat I'm looking at is a 1998 in pretty good shape, needs a little clean-up, but appears sound. I want to upgrade from my current 1997 Dautless 17' bowrider with 2009 Etec 115 because it just rides too rough for my aging bones. How does the 23 Conquest do in open water, have you found any issues that bother you about the boat? Any concerns with trailering the boat? With my current boat I found that the change to a new engine was like night and day. No more blue smoke lingering over the boat, startup is more like a car engine; just turn the key and it instantly starts, noise level and fuel usage were modestly reduced. Overall, my confidence in the engine was dramatically increased. It's no fun going out wondering if you will make it back without a tow.
tom976 posted 02-17-2012 10:43 AM ET (US)     Profile for tom976  Send Email to tom976     
For my situation (wife and 2 kids) its a great boat. Easy to handle and very dry ride in the ocean. I have no complaints about that. Trim tabs help with getting the bow just right with speed and wave chop.

As for trailering it? The trailer I had was shot. When I first saw the boat I was wondering how it even held the boat in place with a load on it. So I had a hauler pick it up and block it up at my house. I then went out with my minivan to get the trailer back to my house. The thing barely made it back. Even snapped a leaf spring somewhere between here and there. The cost to fix the trailer right was about 1000-1500. For me to have it hauled to the boat ramp is 175.00 each way. (so its 350 per year) It would have taken me at least 5 years to recoup my costs. (registering a trailer is expensive here in NY too) I sold my trailer to someone on Craigslist for 300 bucks. I keep my boat in the water all year so no trailer needed for me. Do a search on here. Others do trailer their Conquests. I would imagine a f150 is ok for short or flat hauls, something a but larger for longer ones.


I bought my boat for basically the hull value alone. I paid a few years ago 9 grand for boat, motor and trailer.
It was a very fair price. Its certainly feasible for me to repower with new and enjoy the boat but my ox66 on it still runs well. I take care of her and she takes care of me. Would I ever repower? Not sure. I am in the works of getting a 250 ox66 that needs work. For a few bucks I can have a rebuilt motor that is as reliable as anything out there or just start swapping parts. For the cost of a new motor vs what I have and where I go, i'll take a tow to my marina and have the boat hauled to my house where I can swap motors myself. I will say those new motors out there are sweet. No smoke, fuel savings and hopefully reliability are nice things to have.


The boat I'm looking at is a 1998 in pretty good shape, needs a little clean-up, but appears sound. I want to upgrade from my current 1997 Dautless 17' bowrider with 2009 Etec 115 because it just rides too rough for my aging bones. How does the 23 Conquest do in open water, have you found any issues that bother you about the boat? Any concerns with trailering the boat? With my current boat I found that the change to a new engine was like night and day. No more blue smoke lingering over the boat, startup is more like a car engine; just turn the key and it instantly starts, noise level and fuel usage were modestly reduced. Overall, my confidence in the engine was dramatically increased. It's no fun going out wondering if you will make it back without a tow.

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