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Old 15 October 2011, 07:47   #1
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Yamaha Fuel Consumption

Hi folks. Ive got a Yamaha ME420sti in my rib and was just wondering if anyone knew roughly what the fuel consumption of this engine is? I know there are lots of factors which determine this eg boat size/weight, rpm’s, prop size etc etc but if anyone has a rough guide to this, that would be brilliant.
Thanks in advance
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Old 15 October 2011, 09:17   #2
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Hi CSR
Have just bought new 7.5 cabin redbay stormforce with the same engine with TRP leg.
All up weight must be near 2500kg as my fuel tank is 315lt with 65lt. wing tank, and aux outboard.
I have only put through one tank full of fuel so my calculations may not be too accurate yet - which is 17.5l/hour.
I think the props are 24" from memory. Will check that tomorrow and let you know if that is incorrect.
Hope this is some help.
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Old 15 October 2011, 09:35   #3
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Wing tank, eh? Where did they fit that?
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Old 15 October 2011, 10:07   #4
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Hi Portnahaven.
Crikey a 315L tank? I think mine has a 150L or a 180L tank depending on what you pay attention to. The salesmen at Redbay or the sticky label on my dashboard!! The sticker also says it will do 10L/ph but im not sure at what rpm this is or if its even true. Id be quite intrested to see pictures of your rib if you wouldnt mind sending some to me? If you PM me ill pass my email address.
Thanks for your reply.
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Old 15 October 2011, 10:23   #5
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Looking down on the engine from cabin - square tank far left hand side , level with the top of engine. A bit of a squeeze.
Photo shows yellow strip on lhs where the wing tank is attached on.
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Old 15 October 2011, 10:35   #6
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I wanted a big fuel tank with reserve tank to give me plenty of range, even though it means lugging nearly 400kg extra weight.
As i say, being first tank of fuel my figures might not be accurate. Average speed on log is 18knts. Still running in engine, although it has been bliped up to 35knts.
PM`ing photos now.
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Old 15 October 2011, 10:56   #7
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Some photos-
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Old 15 October 2011, 11:24   #8
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Wa wa wee wa. Very nice indeed. Thanks for sending these over. Good bit more modern than mine but if shes as sea worthy as mine you'll have no worries.
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Old 15 October 2011, 11:29   #9
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Many thanks-
Will give you a shout when i`m down your way
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Old 15 October 2011, 11:31   #10
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Please do. Cheers.
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