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Old 19 August 2011, 10:43   #1
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Yamaha 300 vs Yamaha 350?

I have noticed that the 350 horsepower Yamaha out boat is a V8 and therefor weighs 365KG, compared to the 300's 260KG. Thats over 100KGs more, and I wonder is the extra weight (and the extra s) really worth it for 50hp, when you already have plenty
Any thoughts>
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Old 19 August 2011, 11:44   #2
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Unfortunately I think most of the people who buy the 350 are more interested in that '5' stuck on the cover than looking at the facts and figures.

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Old 19 August 2011, 15:38   #3
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I also think the Yamaha 300 is a better engine, especially the new with bigger cubic inches.

The V8 have the same base as the Volvo XC90 V8 engine i think. And it like petrol
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Old 20 August 2011, 04:42   #4
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Quote:
Originally Posted by co46 View Post
I have noticed that the 350 horsepower Yamaha out boat is a V8 and therefor weighs 365KG, compared to the 300's 260KG. Thats over 100KGs more, and I wonder is the extra weight (and the extra s) really worth it for 50hp, when you already have plenty
Any thoughts>
There's no substitute for CC's when it comes down to pure grunt, torque, torque torque The extra 2 cylinders could make more difference getting a heavy boat on the plane compared to the extra 50hp. Outboard hp ratings are derived from the ICOMIA standard which basically means that the HP at the prop has to be +/- 10% of what it says on the cowl, so in theory a 300hp engine could be 270-330hp at the prop & a 350 could be 315-385hp at the prop. A weak 300hp (270hp) compared to a strong 350hp (385hp) suddenly looks a different (prop)osition (pun intended) Rumour has it that the etec 75hp is actually closer to 81hp & the 90 (same block) is only delivering 85hp & is 500 quid dearer. If you apply the 10% rule to the 75 & 90 you could (in theory) have a 75hp chucking out 82.5 hp & a 90 only giving 81 hp, makes you think dunnit?
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Old 20 August 2011, 13:51   #5
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Here's a pair of 350hp Yam's

Taken yesterday in Poland on the back of a 13.5m Technomarine Rib we sea trialed/demo'd for a customer

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Old 20 August 2011, 14:46   #6
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Unfortunately I think most of the people who buy the 350 are more interested in that '5' stuck on the cover than looking at the facts and figures.
I hope you're not suggesting that some 350 owners might indulge in an "I have the largest production outboard available" type of p*ing contest
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Old 20 August 2011, 20:13   #7
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A friend runs 4 of them on a 50 something foot RIB. Right on 200 hours and every one of the 4 gearboxes has broken and been repaired.

In all fairness, Yamaha said that the Yamaha dealer hadn't refilled the oil correctly as they need to settle for a long time.

We will see.
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