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  100 hp 4-str on BW 15 Super Sport Limited 1987

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Author Topic:   100 hp 4-str on BW 15 Super Sport Limited 1987
Klykan posted 03-20-2004 07:09 AM ET (US)   Profile for Klykan   Send Email to Klykan  
Hej,
I have a 1987 15 ft SSL lying in the archipelago of Stockholm in Sweden. I wonder if someone have experience or knowledge of bigger engine than recommended by the factory. I can get a good deal on a 100 hp Yamaha 4-stroke and now I wonder if this will work. I have today a Johnson 70 hp and a 17 lbs fuel tank.

Many thanks in advance

erik selis posted 03-20-2004 07:35 AM ET (US)     Profile for erik selis  Send Email to erik selis     
Hi Klykan,

Welcome to the forum.

I think the 100hp Yamaha 4-stroke would be way too heavy and would make the boat way overpowered.

Here's a link to a previous discussion on the same topic:

http://continuouswave.com/ubb/Forum4/HTML/002351.html

Jimh, I think we may have found us a Swedish translator on the topic of the Yamaha motor spec's. I just can't seem to find that post....

Erik

flawton posted 03-20-2004 08:30 AM ET (US)     Profile for flawton  Send Email to flawton     
That 100hp is way too heavy for that hull
4whaler posted 03-24-2004 10:48 AM ET (US)     Profile for 4whaler  Send Email to 4whaler     
Way too heavy. My 4 stroke 60 hp Yamaha is too heavy on my 15 GLS II in my opinion, I have to put weight (gear ice chest & anchors) forward to trim up and boat squats a full 2-3 inches lower in the water than my GLS I with a 50 HP Johnson two stroke. Water comes in over the transom big time if I pull off throttle to fast and squat with a following sea.

See pictures:
Hull floating relationship. GLS I on left GLS II on right.
http://home.hiwaay.net/~sickler/enter/bostonwhalers/glsl&glsII/2%20ahead%20view%20hight%20diff%20lrez.jpg

Overhead picture, GLS II on left, GLS I on right.
http://home.hiwaay.net/~sickler/enter/bostonwhalers/glsl&glsII/2%20ahead%20high%20view%201372.JPG

JMARTIN posted 03-24-2004 02:27 PM ET (US)     Profile for JMARTIN  Send Email to JMARTIN     
I have 1/2 interest in an early 80's 15 foot Sport with my brother in law. While I was out of town, the original 70 horse Johnson quit, he was talked into a 70 Evenrude 4 stroke. Big mistake. When you are underway, you can controll the extra weight. When you are stopped you can not. Too heavy. I also put sand bags in the bow compartment to even it out when it sits on the bouy. It also just looks out of proportion with too big of motor for the boat.

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