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Author Topic:   1998 DAUNTLESS 18 Re-Power
gbunnjr posted 02-11-2007 10:18 PM ET (US)   Profile for gbunnjr   Send Email to gbunnjr  
[This article was posted to multiple discussion areas. Please do not post the same article to multiple discussion areas. Posting the same article to multiple areas creates needless confusion and dilutes the information content of the replies by spreading them across multiple discussions. It would be greatly appreciated if this practice was discontinued. I have spent quite a bit of time running around finding all the various comments posted in reply to the multiple posting of this article and collecting them here.--jimh]

I have recently purchased a 1998 Dauntless 18. I am interested in re-powering with a 2007 four-stroke. Would a 115 Yamaha four-stroke be suitable or under powered? The boat is currently powered with a 1998 130 Johnson two-stroke.

Jefecinco posted 02-13-2007 01:09 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Underpowered, IMO.


sosmerc posted 02-18-2007 01:56 PM ET (US)     Profile for sosmerc  Send Email to sosmerc     
I also feel it would be slightly underpowered...unless you have trim tabs, and prop it for MAX rpm and plan to run less than a full load of fuel and passengers. If you are set on a 4 stroke I'd pick the highest horsepower Verado you can afford and legally put on that hull.
Marlin posted 02-18-2007 03:22 PM ET (US)     Profile for Marlin  Send Email to Marlin     
I have a Mercury 115 4-stroke, with the same powerhead as the Yamaha F115, on my 160 Dauntless. It's fine on that boat, but probably less than you'd want on the 18-footer.


jimh posted 02-19-2007 08:52 AM ET (US)     Profile for jimh  Send Email to jimh     
Sorry, but there is no such motor as a "2007" Yamaha 115 four-stroke. Yamaha does not use any model year designators. They just make the F115 four-stroke motor. If you get a new motor, it is just an F115, not a "2007" motor. You might be getting a "2004" motor, if the model designator hasn't changed.

You'll have the same problem with Mercury four-stroke motors, too. They dropped the model year designator as well.

lakeman posted 02-19-2007 04:09 PM ET (US)     Profile for lakeman  Send Email to lakeman     
I have a 2000 Dauntless, with a 135 Opti, and is just enough if I repower it will be with a 150 Opti, or a 150 4 stroke. The way that boat is designed it seems, it needs a lot of power to get the stern out of the hole.
jimh posted 02-12-2007 07:59 PM ET (US)     Profile for jimh  Send Email to jimh     
Sorry--You cannot get any "2007" Yamaha motors. Yamaha no longer sells motors which have a model year identifier. You can buy a new motor, but there is no telling when it was made.
jimh posted 02-12-2007 08:02 PM ET (US)     Profile for jimh  Send Email to jimh     
I have ridden on one boat which had a 115-HP four-stroke. It was a 17-foot center console (not a Boston Whaler). With four adults aboard it would barely get on plane. The poor motor labored for about a minute to accelerate the boat to plane. We had to send someone to the bow to bring it down and let the boat climb out of the hole. Not very impressive. And this was on a 17-footer.
BOB KEMMLER JR posted 02-12-2007 08:17 PM ET (US)     Profile for BOB KEMMLER JR    
From what i have heard of that particular hull,anything less than a 150 is a poor performer(mainly when loaded down with a few friends for a day of fishing) but they are also sensitive to weight on the transom and will porpoise badly if too heavy of a engine is used.This is gathered from a couple people i know personally with this hull.One sold the boat,the other went with a carbed 200 Mercury motor and loves it.
Marlin posted 02-12-2007 10:44 PM ET (US)     Profile for Marlin  Send Email to Marlin     
I run a Mercury 115 4-stroke (same powerhead as the F115) on a 160 Dauntless. The performance is good, but not astonishing. I don't think there's any way it would be adequate on a 180 Dauntless.


David1877 posted 02-13-2007 11:51 AM ET (US)     Profile for David1877  Send Email to David1877     
I owned a Dauntless 18 powered with a 135 Optimax for several years.

I used the boat for fishing and water sports. I was able to tow a Great Big Mable with four persons without difficulty on Lake Michigan. The Optimax 135 provided ample power with a full load of passengers and gear.

Note I said ample. I think the 135 is a good match, and I would not go any smaller than boat.

Before I decided to sell my boat, I considered repowering my Dauntless 18. I considered the Yamaha fuel-injected 150.

Teak Oil posted 02-13-2007 06:47 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
The Yamaha 150 and Suzuki 150 are both fairly strong motors for four strokes. Several members here have 150 E-Tecs with great results, is there any particular reason you have ruled them out?

The Honda 150 is a good motor too, but there is one member on here having some issues with one right now.

lurkynot posted 02-13-2007 06:52 PM ET (US)     Profile for lurkynot  Send Email to lurkynot     
I have an 01' 18 Dauntless with the 135 Opti. Original owner and would'nt trade the setup for anything less. This is not to say it under powered at all. Ample hole shots and acceleration with 4 adults aboard - the boat is fitted with tabs which I believe is a must with this hull. In fact most of the time the hull on Lake St. Clair where I generally boat will not allow me to use the upper power band of the motor unless I want to knock the fillings out of my teeth when the going gets rough. And the economy of this power plant is second to none. Also I have a hard time running 3 gallons of oil through the boat in one summer and I average 100hrs a season.
gbunnjr posted 02-19-2007 01:34 PM ET (US)     Profile for gbunnjr  Send Email to gbunnjr     
thanks so much for the input. I am looking into re-powering with the suzuki 4 stroke 140..weight is 420lbs or the Yamaha 150 4 stroke ..weight is 466lbs.. Which would be best??
Teak Oil posted 02-19-2007 04:22 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
The 140 Suzuki weighs less because it is basically a souped up 115. Both engines share the same block. The Yamaha has a lot more displacement, hence the heavier weight.

The 140 will sip fuel compared to your current engine and probably have almost the exact same performance. The Yamaha will get great mileage too, but probably not as good as that Suzuki 140. The Yammie will have considerably more power and top speed. It will cost a lot more initially also.

What's your priority, fuel mileage and price or reserve power and top end speed?

ConnorEl posted 02-23-2007 04:11 PM ET (US)     Profile for ConnorEl  Send Email to ConnorEl     
I have a 2000 Dauntless 18 with a Honda 130 hp (four stroke). My motor provides plenty of power for carrying maximum people and water sports.

I would note that the design of the boat is not optimal for heavier engines (most four strokes). I would advise you to get the motor that provides the most hp per unit of motor weight. If you were going to get a 115 hp then I would definitely recommend that you give the E-TEC a look. It weighs 375 pounds.

Between the Suzuki 140 and the Yamaha 150, I’d take the Suzuki because it’s less expensive and lighter and plenty of power.

gbunnjr posted 05-01-2007 02:27 PM ET (US)     Profile for gbunnjr  Send Email to gbunnjr     
thanks for all the input...I am going with the 140 suzuki, I will let you know how it performs....
gbunnjr posted 11-06-2007 03:11 PM ET (US)     Profile for gbunnjr  Send Email to gbunnjr     
I eneded repowering with the 2007 140 suzuki four stroke, plenty of power and the Gimme 6 warranty suzuki provides is re-assuring. Love the combination of the 18 dauntles and the four stroke range...
iamjcl posted 05-05-2008 11:57 AM ET (US)     Profile for iamjcl  Send Email to iamjcl     
How does your new motor compare to the old 2 stroke 130 ?

What RPM / cruising and WOT speeds are you getting with the Suzuki ?

Any problems or other issues ?


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