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Old 17 July 2012, 15:59   #1
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18hp Tohatsu on max rated 15hp SIB

I've just bought an 18hp 2-stroke Tohatsu for my 3.3m SIB.

I was looking for a 15hp but at 670 I think I've had a bargain?!!

Anyway, I'm hoping for some reassurance that the engine will be ok on my SIB max rated 15hp. It's the 41kg model so I imagine weight isn't the issue?
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Old 17 July 2012, 16:02   #2
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No chance! It will be dangerous and I strongly advise you to stick to the ratings. You've wasted your money. That being said.... I guess I can give you 750 for it if it gets you out of trouble

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
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Old 17 July 2012, 16:19   #3
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Great buy, I was tempted but couldnt think of an excuse for Wifey if I bought another engine !

In practical terms there will be no problem using a slightly over sized engine, the transom wont fall off and the boat wont shred its self.

But a couple of words of caution. An oversized engine could invalidate your insurance and if you are lightly loaded and going into a head wind, keep as much weight forward as possible.
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Old 17 July 2012, 16:42   #4
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Lucky git. You MIGHT want to clear it with the Insurance company, but I can't see it doing the SIB any harm. Of course, if the transom falls off, I've never heard of you
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Old 18 July 2012, 15:07   #5
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That 18 is going to push you into the middle of next week on a 3.3m
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Old 19 July 2012, 03:34   #6
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Thanks for the replies, it seems I should be using it with plenty of caution!

Will definitely be taking it slow first time out.
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Old 22 July 2012, 05:36   #7
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Is the weight of an 18hp greater than a 15? If not, there shouldn't be a problem as, unless you're running it at full throttle, you wont be using 18hp anyway.

Personally, I would've thought 15hp was overkill for a 3.2 boat. Unless you are going to be loaded to the max.
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Old 22 July 2012, 11:19   #8
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I don't think you have anything to worry about. Drive according to the water conditions and have fun.

As an aside, I have an old zodiac Mark 1c, which is about 3.3m which is rated for a max of 25 hp. With a 25hp motor and a light load, you would only run at WOT if on glass smooth water. With even slightly choppy water, cranking the throttle could easily bounce you out of the boat.
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Old 22 July 2012, 14:05   #9
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The max engine weight for the boat is 55kg, which I imagine is the heaviest of 4 stroke 15hps.

The Tohatsu I have is only 41kg so well within the max.

I'm just going to take it easy and judge the conditions/how the boat responds to the throttle. I won't be using it with any less than 1 other adult and a reasonable amount of gear anyway so I'll stick the weight forward to try it out.
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Old 22 July 2012, 17:18   #10
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I'd be happy with it!
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