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Outboard repower from 2 to 4 stroke: worth it???

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Outboard repower from 2 to 4 stroke: worth it???

Old 10-12-2017, 09:51 AM
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Default Outboard repower from 2 to 4 stroke: worth it???

I have a 2001 Rosborough 246 RF that I purchased this year with an all fresh water 2002 Yamaha Salt Water Series 150 hp 2 stroke, 314 hours. Rumor has it that these are very dependable and durable motors. The motor has been flawless, albeit a touch on the noisy side, and given that I'm very noise sensitive was wondering whether switching to a similar hp 4 stroke would be worthwhile in that regard. I would imagine the cost, including install and gauges, would be in the $17-18K range. Not cheap.

So looking for opinions from those in the know.

Will a 4 be significantly quieter compared to my particular 2 at all rpm's?

Would it be difficult to sell the 2 and rough value?

Are some 4S brands quieter than others?

(I know there's always Etecs but I did not want to spread the conversation too thin!)

Thanks for all your help!
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Old 10-12-2017, 10:23 AM
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I had a new verado on my last boat and it was extremely quiet. So quiet that I forgot it was running on many occasions. My current boat has an optimax and I too am going to repower with a Mercury 150 4 stroke for the reliability of a new motor. I don't have much experience with the Mercury 150 4 stroke, but videos I've watched on YouTube shows it being a lot quieter than my current optimax.

For reference I've gotten quotes for the new 150 at $12,000 which includes tax and installation. I am reusing my controls.
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Old 10-12-2017, 11:13 AM
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If noise is a huge concern and worth 15k to you then yes. Otherwise I'd run that 2002 until she can't go anymore.
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Old 10-12-2017, 11:54 AM
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To answer the question in your title, IMO absolutely positively. You will wonder why you waited so long to make the swap.

There are two kinds of four stroke owners. Those that have tried to start it when it is already running and those that will try to start it when it is already running.

Oh, remember to turn it off before hauling the boat out of the water on the trailer.
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Old 10-12-2017, 11:58 AM
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Originally Posted by Hook Marine View Post
If noise is a huge concern and worth 15k to you then yes. Otherwise I'd run that 2002 until she can't go anymore.
X2
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Old 10-12-2017, 12:53 PM
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Thatís a lot of money for a quiter motor and better mpgís.

Maybe find a good used 150? Save a lot of money that way. Yamaha 150 4 stroke is probably the best motor they have ever made. The 2 stroke version is very good to.
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Old 10-12-2017, 12:57 PM
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Personally I would keep the two stroke. Eighteen thousand buys a lot of fuel and upkeep. I re powered my boat a couple of years ago going from twin Yamaha 200's to twin Honda 150's. My old engines were about played out and I love the new ones. Yes they are quieter and use less fuel. Upkeep is more than on the two strokes but on the other hand I don't have to buy oil anymore.
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Old 10-12-2017, 01:04 PM
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17k buys a lot of foam ear plugs.
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Old 10-12-2017, 01:27 PM
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I think you would be very pleased with the result by re-powering to a Yamaha F150. The quiet operation, the ease of start up, the economy, and the clean rigging appearance give the sense of having a new boat. The quiet operation is alone worth the net cost, but when you add all of the other factors, the increase in boating satisfaction is priceless. Of course, the re-power can really only be justified if you plan on keeping the boat for the foreseeable future.

I planned on an additional 5 years when I did my re-power, but ended up keeping my boat for another 10 years or so. The value just kept on getting better and better each year.
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Old 10-12-2017, 01:42 PM
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a new 4 stroke 150 will not give you the same performance as that 2 stroke 150, you'd have to go up to a 200 4 stroke at least.. It will be night and day difference as far as sound goes but I'd take that 2 stroke any day of the week.
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Old 10-12-2017, 01:57 PM
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Originally Posted by Hook Marine View Post
If noise is a huge concern and worth 15k to you then yes. Otherwise I'd run that 2002 until she can't go anymore.
this. As noted already, $17K buys a lot of fuel and ear plugs.

But if you are stuck on a new 4S 150, my recent homework tells me that the 4S 150 to get these days is a Merc. All the 4S's will be darned quiet compared to that old motor. At idle, I can't tell if either of my merc 115 or my Yam 300 is running. At cruise, I can't hear the merc over the wind noise. The Yam 300 is a bit louder, but that could be because there is a taller windshield and thus a larger sound chamber

You will (should) have similar performance at the top end with correct propping, but you might notice less torque in the lower and mid ranges. Might.
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Old 10-12-2017, 02:46 PM
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Made the switch last year from Suzuki EFIs to Merc 150 four strokes. Quieter, cleaner, easier to start. Quite happy.
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Old 10-12-2017, 03:43 PM
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Great info thanks.

What would be the best way to sell the frsehwater 2S; given it's a 16 yo motor is there any market for it and if so what price? Or just put it up for bids on Ebay?

Can't imagine how one would go about shipping a motor.
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Old 10-12-2017, 04:11 PM
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Originally Posted by dogwood84 View Post
Great info thanks.

What would be the best way to sell the frsehwater 2S; given it's a 16 yo motor is there any market for it and if so what price? Or just put it up for bids on Ebay?

Can't imagine how one would go about shipping a motor.
I would keep that motor until it doesn't run anymore. Problem is that might be a long, long time. Those motors are what built Yamahas reputation. Because you can't buy a new one anymore, they are becoming harder and harder to find. There is absolutely a market for them.

You could try posting it on Craigslist. Priced fairly, $2500 to $3000, that motor won't last more than a week on the market.


To sell it you'll need to keep it on your transom until you find a buyer so that the buyer can sea trial it. Old school 2 stroke buyers will tend to be knowledgeable buyers who will find a way to get it off your transom and onto their transom.
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Old 10-12-2017, 04:20 PM
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https://www.walmart.com/ip/Flents-Pl...10-Pr/10535851


Just saved you $15,000+.

Seriously though if you have the money I'd go to a Suzuki df150+, straight 4.
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Old 10-12-2017, 04:27 PM
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Originally Posted by dogwood84 View Post
Are some 4S brands quieter than others?
Yes - just the same as not all 2 strokes make the same amount of noise - I've used some strokes that weren't particularly quiet and some that are whisper quiet - but if you're buying new they are all pretty quiet now. There was a thread on here just the other day comparing the noise of 150's and it was also noticeable there was an 8mph top speed differential - I can't recall which performed best, so search for the thread - the only thing I can recall is that Hondas were quiet but slow - which is fairly typical of comparisons I've seen for the brand. There is also cost of course - the Mercury does look to offer best value and also has a reputation for being pretty bullet proof.

Noise perception can be a strange thing though, so before buying, in your shoes I would want to witness each engine on my shortlist first hand.
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Old 10-12-2017, 04:36 PM
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As many have said, this Yamaha motor is one of the best they every built. Reliable yes, fuel efficient a bit better than a carb motor, loud yes and if the noise bothers you then get a 4S as it is your boating experience to be enjoyed. Maybe about $3K due to low hours and it wonít sit long. However, your quote of $17-$18K for a new 1504S maybe on the higher side. Maybe itís for a Yamaha with FBW, Digital gauges, SS prop but still. Many other 1504S can be had for less. I have seen $11.5K installed Tohatsu 150, $12.5K for Mercury 150 and Iím sure Suzuki is somewhere in between that or less. Good luck and keep us posted.
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Old 10-12-2017, 05:24 PM
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I have a 2002 RF 24 5 with a Yamaha 150 HPDI. Bought her in 2015 with 1050 hours, just turned 1415 hours tonight. Run it 3700/4200 rpms no problems since I bought it. The boat came from North Carolina. The previous owner used West Marine 2 cycle oil and ethanol gas. Boat ran ok but missed once in a while. I started running Yamalube 2 cycle, ring free and Rec 90 gas. Change the plugs every 100 hours or so. Raycor and waterpump every 200. Engine filter is always looking good. I average 2.4 MPG. with trim tabs set. Engine never has even a hiccup. By my oil in a 55 gallon drum. Do I want a new engine, yes. Dealer say no this thing runs good don’t waste your money. Noisy, just run with the back door shut. Wife and I love the boat.
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Old 10-12-2017, 05:43 PM
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my vote is for no buy and stand pat. Many repowered boats for sale and still for sale. The motor you have is running well and by your admission has a reliable history.

Unless you have $$$$$$ to burn keep it imo.
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Old 10-12-2017, 06:43 PM
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I am a 4 stroke guy and I would not buy another 2 stroke but if I had one that was running well and only 300 hours on it, I would run it until it drops.
If you are thinking about a repower, as you can see there are plenty of guys who like your old motor. Float out a ridiculous price on craigs list, keep running it, take the buyers for a ride and see if they bite.
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