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Old 21 March 2008, 15:51   #11
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The Yamaha 350 or their 300 weighs 804lbs or 365kg - compare that to the Mercury 300xs at 517lbs or 235kg - a difference of 130kg or 20 stone......

Ther Verado 350 is 300kg.


http://www.mercuryracing.com/outboards/optimax300xs.php
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Old 21 March 2008, 16:00   #12
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I had a 225 on our last rib but we have a 250 now its two years old and never missed beat, As for the weight
the whole question is up for debit, Its do you want flat out speed where money is no object for fuel, strap the kids etc.

the way i see it, if you have a Merc 300XS Etec 300 fully laden with fuel and four up
and i have half a tank and two up,
Just how much quicker would you be in a slight to moderate sea state
I went with Yamaha because my last four engines have been Yamaha,and i feel confident with them, but thats not to say Suzuki, Mercury Evenrude are not just as good, and in other ways better, the thing that would swing it for me is the free extra warranty and lets face it 0% money cant be bad
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Old 21 March 2008, 17:02   #13
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Tx. guys,

From my POV a good discussion with some good points made. The only things I can add, if anyone is interested, is that I know that this same rib was sea tested with 2x225 optimax engines, and Vengeance 21" prop, which was considered to be rather short with two people and 300 litres of fuel. It touched 47 knts at 5,600 RPM in not totally calm seas.

The dealer, on the other hand, prefers the single Yam F350, which he claims will push her to about 53 knts with ease.

These points need to be considered in the light of what has been discussed here.

Rupert.
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Old 21 March 2008, 20:25   #14
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Yamaha 350 Giant

I have just bought a Mercury 300XS for my 8.5 metre Scorpion. Your example of twin 225's on a rib doing 47k looks slow as I have been on a Scorpion with those engines and Sportmaster gearboxes doing 62 knots. The single 225 on our 7.5 Scorpion does 48k. Not sure how fast our new boat will go but there have been some Dutch owners reporting kph speeds in excess of 100 on similar size Revengers. Gavin
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Old 22 March 2008, 01:33   #15
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Hi
Graham Jelly has his Scorpion up for sale which has twin 225 opti and that push's over the 60 knot mark.
As for the 350 Yamaha...Its seems a bit of a lump compared to other options available. The Verado 350 is released in Nov according to Barrus.
Tony
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Old 22 March 2008, 08:32   #16
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Most points well covered here on the Yam 350hp, however talking with fellow boats they did make 2 points stand out to me...these engines were not intended for go fast boats more suited to a heavy boat that may often have deisel engines installed from the manufacturers... and how true it is I do not know that they produced 325+hp in testing and not 350hp as on the lid as regards fuel as this engine has a role on heavier boats and with it's higher CC it's MPG would therefore be worse than it's lighter competitors
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Old 22 March 2008, 13:32   #17
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Yes I have also hear that the Yam isn't even making 350 - they claim the Verado 350 is nearer 375 - we will see!!!
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Old 22 March 2008, 16:37   #18
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I see the common sense in swapping big diesel inboards for twin out boards
on say a sun seeker Sports Fisher, especially if you are a commercial user
if some thing big dose go wrong with the inboard then its out of the water and a major job to sort were as with the out boards its just the time it takes to swap one out board for another, i don't think the 350 Yamaha was designed for us lot I know some one will tell us the dangers of petrol against diesel, but thats the trade off
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Old 22 March 2008, 17:54   #19
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Yes I was suprised at Yamaha bringing out that monster but they obviously identified a particular market for it.

Sterndrives can have all sorts of problems that are avoided with an outboard.

I do think there must be loads of potential with that monster V8 5.3L - the Verado must be up to it's limit now as it's only a 2.6L even if it is supercharged. Yamaha could probably go to 500hp without it being too stressed - now that would be the boy - the weight wouldn't matter so much then!!!
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