New outboard recommendations/ advice 140-150HP

 Hi Guys, 


I am currently doing a bit of research as I am thinking of re-powering my boat in the near future.

At this stage I am wanting a 140-150hp (Still tossing up brands) and just wondering what experiences you have had good/ bad.  

I understand the boat show is coming up (if it goes ahead) and that there is often deals that vendors will have but I still want to get an idea of what others have paid etc. in the meantime. 


If you are willing, can you drop me a PM and let me know things such as brand, price, warranty, fitting, finance, extras and who supplied. 



Posts: 4225

Date Joined: 01/02/10

 I have a pair of yamaha

Sun, 2020-08-02 13:42

 I have a pair of yamaha f150's on my rig. Well proven engines. I have just over 1400 hours on mine. 


Does anyone know where the love of god goes, when the waves turn the minutes to hours?

Adam Gallash's picture

Posts: 15313

Date Joined: 29/11/05


Sun, 2020-08-02 15:03

 Just bought a new suzi 4 140hp, super impressed. First run yesterday and did 200km for 90l going through all the rev ranges. Very quiet as well. Happy with my decision.


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PM sent

Sun, 2020-08-02 15:06

PM sent

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Date Joined: 16/05/09

 Huge difference between the

Sun, 2020-08-02 18:04

 Huge difference between the Suzi 140 and yami 150. Have had both and yami wins hands down.  My choice would be the yami 150

Posts: 15

Date Joined: 29/09/15

Big Difference

Mon, 2020-08-03 06:15

 Just keep in mind the 140 Suzi is an up spec 115, same 2L block, same ratios just different ecu. The 150 (suzi or yam) are in the next class, bigger capacity block 2.7Lish a de-rated 175 - 200. In saying that i had a 140 suzi on my old boat a 5.7 trailcraft and it was a perfect match. I just know that there are people who put them on larger boats who are disapointed with power. Both great engines just depends on what you're bolting them to. 

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Date Joined: 21/05/12

dont believe the hype u have

Mon, 2020-08-03 09:14

dont believe the hype u have to go bigger than the 2 stroke u had on 

175 johno 2  to a suzi 175 4 got me 3 knots extra  -and heaps more out the hole

fuel is less than half and the noise  is not comparable

i miss the smell of the 2 stroke after a long dive   ;p

do it- jsut dont get caught out on installation "extra charges" after they gve u a quote

ranmar850's picture

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Date Joined: 12/08/12

150 Merc 4s beats them all

Tue, 2020-08-04 10:43

 140 Suzuki is only a higher revving 115, 1.7 litre in capacity. The Yamaha, whilst a proven, reliable engine, can't match the Merc for Grunt. This, from comparisons mounted on the same hull. The Yamaha has a much larger capacity than the Suzuki, at 2.6 litre. But it also weighs 228kg. The Merc has a full 3 litre capacity, and weighs 207 kg. It is a lower revving engine ( max revs 5200-5800 rpm)  relying on capacity rather than revs to produce the power. I have done just under 600 hours in just over 2 years, nil problems. And I have a 6 year warranty, hours unlimited. 

Mine is pushing a Caribbean Reefrunner. 6.4 m ( measured minis bowsprit and paltforms, weighs 2 tonne on the water fuelled up with 2 POB)  People will automatically say that 150hp is "too small" for that hull, with a max transom rating of 200hp. In most cases, yes. The  few owners who I have spoken to with the 150 Yamaha fitted to this hull feek that it does lack a bit at times. With the Merc fitted,  all you are mssing out on is the ability to cruise over 30 knots. With a top end  of 35-37 knots, depending on fitout, you are using 5000 rpm to hold 30. 4500 sees about 26-27knots with good fuel flow. If you want best economy, anywhere from 3700 to 4200 sees good speed with good fuel flow. 

The following are screenshots from the engine interface, from a recent trip to Exmouth. These are taken in calm conditions, but I seem to get prretty much the same in most conditions. NOTE that i am using nautical miles  the only unit to use at sea, IMO  ) I NM is 1.852 km.  Boat is fully loaded.





fast cruise Exmouth Gulf Exmouth Gulf cruise Exmouth Gulf fast cruise 4 Exmouth Gulf fast cruise 5 I don't have any current screen shots for the lower speeds, but it runs at a steady 1.2 l/NM all the way from 3700 to 4250 rpm. So you can get good speed with no increase in fuel used whatever over a given distance. And before anyone says that isn't good, I'm not pushing some 5.6m forward control boat with no top that weighs maybe a tonne on the water, this boat is 2 tonne on the water.


And for those challenged with speed, 31 knots = 57.4 km/hr

                                                      27 knots = 50km/hr


My normal cruise is around 4000rpm at 21-22 knots. 

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PM sent

Tue, 2020-08-04 16:47

PM sent

Stevo81's picture

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Date Joined: 16/04/12

 I'm with ranmar. Merc 150

Tue, 2020-08-04 20:58

 I'm with ranmar. Merc 150 for sure 


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Daryn's picture

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Date Joined: 01/05/12

I have mine on a 6.4 Glass,

Wed, 2020-08-05 09:11

I have mine on a 6.4 Glass, it doesn't feel underpowered with the 150 merc. Very similar results to Ranmar's report. I have towed skiers behind it without complaint. It hasn't missed a beat, it's 3 years old with about 300 hours on it.

Belly Fish's picture

Posts: 427

Date Joined: 09/03/12

My rough figures...7.5m Genesis Ali Hardtop

Tue, 2020-08-04 16:14

Interesting figures above Ranmar.

I have just upgraded my 10 year old twin 150hp 4 stroke Yamahas to a pair of 2020 models. The old had 19 inch pitch stainless props, which I spent a lot on (around $2,500 if I remember correctly).

I measured my fuel economy on the old motors from new and for 946 hours averaged 1.82 litres per NM (both engines combined).  Best I got was 1.62 litres per NM and worst was 2.02 L/NM.  I found the best RPM to be 3000 - 3400, doing 22 - 25 knots depending on sea conditions.  

I've only done 8 hours with the new motors.  Same pitch Yamaha stainless props, but what I see is different and maybe I need to change props.  Seems I need to run at a higher RPM to achieve the same speed now.  Last Saturday I was running around at 3500 RPM for around 25 knots.  For the two trips I have done (first one included a bit of run in), I've averaging near enough to 2 litres/NM.  On face value, this is a bit disappointing, but I guess still pretty good at around 1 litre/NM for each motor.  At this stage its around 10% worse than the old motors.  

BTW, the boat did 44 knots WOT during the prop test, which is fast enough :-)


Posts: 675

Date Joined: 21/05/12

 well thats interesting belly

Tue, 2020-08-04 16:16

 well thats interesting belly fish - could it be its still running in 

thought the new motors are better than the old

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Date Joined: 28/11/16

The figures seem quite good

Tue, 2020-08-04 21:05

The figures seem quite good however jury is still out on the new mercs as they haven’t been around long enough. I prefer Yam 

ranmar850's picture

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Date Joined: 12/08/12

err, try to keep up

Wed, 2020-08-05 09:54

   The "new" 150 4 stroke Mercs have been out since 2012. The start of their new range. You are probably thinking about the V6/V8 range, released about 2 1/2 years ago. The 150 has proven to be exeptionally reliable--one user on THT had near 3000 hours on his, 18 months ago, zero problems.


If I were doing the exercise again, would I choose the same motor? Would depend on the price at the time. I've been PM'ing with a bloke on here re engine choice for a new Reefie, and IIRC, he said it was only 6K more for the 200 hp v6. At that price, I'd go for the speed outright, because that is all that it is. Any other useage, 150 is fine. It would be nice to do 35 knots back across the gulf on a flat calm late afternoon, instead of 28 knots. When I bought mine, there was a special on the 150's, and I got it for $17K. $10k or more extra  for most 200's, not worth it, IMO. And the new Mercs weren't available.

NORUN NOFUN's picture

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Date Joined: 15/08/11

Yep, no jury out on Merc

Wed, 2020-08-05 10:00

Yep, no jury out on Merc 150's, plenty of history out there now with enough forums highlighting the good and the bad. Unfortunately a poor setup seems to be the reason behind so many arm chair critics ( this is not directed to anyone on here, just my perception of forums) on performance for any of the brands mentioned.

Posts: 544

Date Joined: 28/11/16

Yeah I’ve read people have

Wed, 2020-08-05 19:57

Yeah I’ve read people have had a few issues with them. Yam Honda and Suz have better resale value though  

NORUN NOFUN's picture

Posts: 661

Date Joined: 15/08/11

Like everything SK, you only

Wed, 2020-08-05 20:12

Like everything SK, you only have to look on fishwrecked for negative comments on yam and suzi's.
I don't agree with the resale value about mercs and I do not own a merc, personally I would seriously consider all the top brands, brand selection may come down to weight, sales, servicing and personal choice.