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  Repower '93 15' Dauntless; 60 or 70 2 stroke or 4?

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Author Topic:   Repower '93 15' Dauntless; 60 or 70 2 stroke or 4?
Hudsonwhaler posted 08-21-2004 05:57 PM ET (US)   Profile for Hudsonwhaler   Send Email to Hudsonwhaler  
I'm looking to replace the Yamaha 50 2s on my Dauntless 15. Can anybody give me compelling reasons to go with either a 2 stroke 60 or 70 Yamaha (because I already have the controlls) or a 4 stroke 60 or 70? Would a 70 (over a 60) give me that much more for the extra money spent? Would it gobble much more gas? Would anybody buy a Suzuki (or ?) over a Yamaha? I'm thinking I'll go with a leftover '03 or '04 model to save bucks, but maybe a used late model.
rbruce posted 08-21-2004 11:09 PM ET (US)     Profile for rbruce  Send Email to rbruce     
I don't think that the fuel efficiency of the 60 or 70 two stroke "legacy" motor would not be offset by the increased price and weight of the four stroke version of the motor, however, with the advent of more stringent laws curtailing CO2 emissions in the future, you might be slapped in the hand and prevented to do boating in some lakes with the legacy motor. In this case, I would still opt for a direct injection two stroke such as the Evinrude E-Tec of the desired horse power rating and have the best of both worlds: comparable fuel efficiency, three star pollution rating and the quick response of the two stroke world.
BOB KEMMLER JR posted 08-21-2004 11:16 PM ET (US)     Profile for BOB KEMMLER JR    
I say go with the 90 yam 2 stroke same weight as the 70 and that hull would love the extra 20 ponies.
imko posted 08-22-2004 01:00 PM ET (US)     Profile for imko  Send Email to imko     
I had before my Montauk 170 a Dauntless 15 with a 60 Yamaha
4-stroke. Standard alum. prop and a top speed: 36 mph.
Fuel consumption is very good.
Trip from Vlieland to Franeker with this engine: 22 liters.
Same trip with Montauk 170 with 90 Mercury: 42 liters of fuel.
A very smoot running engine..............
Max. rpm with 1 pers. and a 24 ltr.tank (6 gallon)5500.
It is the perfect engine for this boat. Handling is good.
Next year they are coming with EFI!!!
A fiend had also a dauntless 15 with a 75 Mercury 2-stroke.
It's overpowerd at see !!!

Florida15 posted 08-23-2004 12:05 PM ET (US)     Profile for Florida15  Send Email to Florida15     
I've got a 70 hp Johnson 2 stroke on my '96 Dauntless 15.
Seems to be a great combination.
Bigshot posted 08-23-2004 01:57 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Go with the Merc 60 4 stroke in EFI. Controls will fit, tach....nah!
JohnJ80 posted 08-23-2004 11:06 PM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
I repowered my D15 last year with a 75HP FICHT Evinrude, 2003. I love that combination. I had a Johnson 70HP 2 stroke on it before that had a problem with the VRO and was heading for a ring job - even though it performed ok.

First of all, I would recommend the max horsepower you can get on the boat. The D15 performs very, very well at that level. If you have the max horsepower and you max load the boat it will still perform nicely. Empty it is a rocket. I can't speak for a smaller motor, but I can attest to the drop in performance as you load her up. There just isn't all that much waterline to absorb the effects of more weight. The D15 is such a secure boat, that it is easy to load it up and still have it perform well.

The differnce between an DFI and electronic fuel injected motor and a 2 stroke is profound. You have far less smoking, you will get a lot more range per tank of gas (something like 40% in my case over my Johnson 70HP 2 stroke). I would never go back.

So, the problems with a DFI or a 4 stroke on this hull:

The hull is very sensitive to aft weight. If you put too much without proper adjustment you will find the ride to be harsh, porpoising distresssing and be pretty unhappy with the whole thing. However, you can deal with this and you can make it be a better combination than the stock 70HP Johnson on this hull. I posted a complete thread on my efforts to deal with the problem - search for my name and repower and Dauntless and you should find it.

You will need to put some time into adjusting it all, but you can probably just follow my experience and mount her all the up on the transom and have at it.

I think the perfect combination for this boat would be the new Evinrude E-Tec 75HP motor. They are the DFI technology, fuel injected and they are very light - inside of the 305lb weight that Whaler will tell you works well if you put on a 2 stroke Merc 75HP motor. This would give you the best of all - a DFI/EFI motor, quiet, clean and fuel efficient but yet be at or close to the max horsepower rating.

Let me know how I can help.


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