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Old 05 February 2008, 10:43   #1
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Newbie Q - What outboard for a 3.1m RIB?

I've been floating around on the peripheries for some time just lurking and eventually decided to take the plunge and ask, regardless of whether it sounds stoopid!

I am awaiting delivery of a 3.1m RIB for just cruising and family fun etc.. (15hp max in the spec).
I've spent hours looking around on the net at different sites for outboards (new) but I reckon the water's getting muddier. Should I be looking at a 9.9hp or a 15hp, I do want a four stroke with a short shaft, that much is decided. Wondering between engine weight and size is driving me round the twist.
Has anyone any experience to share with me regarding what to go for between those two engine sizes.
I know I'll probably look back on this question in the future and realise how dumb it may sound but I am very very green, bear with me please.
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Old 05 February 2008, 11:29   #2
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If you know you want a 4- stroke, then I guess the toss - up is between having that extra oomph and getting a hernia lugging an extra 10-15 KG up the beach.

If it's any help I've used an OMC Express 3.1 (not too dissimilar to your new toy) with a two stroke 8Hp on the back. Went like a mad thing 1 or 2 up, 3 or more (adults) it struggled to plane.

I suppose it may depend how you plan to get it to & from the water - if you are on a trailer or will always be able to park a few yards from the shore, go for the large one, if you have to lug it across half a mile of sand to get back to the car every time, I'd be tempted by the lighter one. Also if you're deflating or car topping the hull, check the size in the boot when you're at the dealer - Small outboards have an annoying habbit of growing when you show them a car boot, and if you have the whole family with you, that space will likely be at a premium!

Some food for thought - hope it's of some help, there are lots of SIB owners on here who I'm sure will be along shortly to add to the discussion......
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Old 05 February 2008, 11:36   #3
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15hp two stroke is the way to go for performance and family cruising IMHO.
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Old 05 February 2008, 11:43   #4
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I have owned the 10 hp honda and now own the 15 hp they are worlds apart in performance and you dont really notice the weight difference. If you can manage the smaller you will cope with the bigger imho.
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Old 05 February 2008, 12:02   #5
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Hi, we have used a suzuki aux on our previous boat and liked it so much we bought a larger suzuki for our new boat which was a shift away from mercury which i would have advised before now. (not that there is anything wrong with them)

Anyway have a look at the Suzuki 9.9 and 15 youll find they are the same weight so based on that and the fact you can allways slow an engine down but not speed it up without altering the engine i would recomend the 15hp
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Old 05 February 2008, 12:59   #6
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I believe that all the major manufacturers eg Honda,Suzuki,Yamaha and Mercury produce reliable quite similar products in the 9-15HP ranges. Furthermore, the weights of their 15HP models vary from 47.5kg to 52kg so there is little to choose between on weight criteria. So IMHO I would seek the best deal you can get, with this in mind Tohatsu may be worth looking at, they are very good value. If you are willing to consider a 2-stroke, Tohatsu can provide a 9.8HP weighing in at only 26kg whilst their 15HP 2-stroker is only 41kg, and a lot cheaper than a 4-stroke. I have no connections with Tohatsu!!!
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Old 05 February 2008, 15:35   #7
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We use a 15 hp Yam ( 2004) fourstroke on our 4 mtr inflatable, its the same block as the 9.9.
It gets up on the plane easily and is fantasic on fuel, we cannot fault it.
gaZ
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Old 05 February 2008, 15:41   #8
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I have a 15hp Suzuki 4 stroke on a 3.1m and it's great but I would rather a 2 stroke. They are easier to carry - give more grunt and easier to transport(lie it down any old way).

The 18hp Tohatsu is the same weight as the 9.9 if I remember correctly.I would always go for the biggest engine you can in the same weight range.

Unfortunately small 2 strokes are vanishing fast so if you have to get a 4 stroke go for the cheapest deal they can - all the makes are prob as good as each other.
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Old 05 February 2008, 15:46   #9
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Quote:
Originally Posted by yoyo View Post
15hp two stroke is the way to go for performance and family cruising IMHO.


Quote:
Originally Posted by Cypman View Post
.... If you are willing to consider a 2-stroke, Tohatsu can provide a 9.8HP weighing in at only 26kg ....



Quote:
Originally Posted by codprawn View Post
I have a 15hp Suzuki 4 stroke on a 3.1m and it's great but I would rather a 2 stroke. They are easier to carry - give more grunt and easier to transport(lie it down any old way).....
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Old 05 February 2008, 15:59   #10
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If its a 4 stroke for sure then check all the manufacturers for the wieght of the motor . Wieght has to be the most important factor or lack of it .

the honda 20 was by far the lightest in a 20 also available as a 15 but somebody may make a lighter 15 4t now.
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