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Old 26 August 2013, 05:57   #1
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Performance Advice Please

Hi all I'm after some advice I have just returned from a holiday in Dawlish and took my 2.9 Mt Proshore sib out for its first sea trip at Teighmouth and was disappointed in my engines power performance just could have done with more speed. I have a mercury 4hp 4 stroke which is a fantastic motor for rivers and alike but at sea with two 72kg adults fuel tank and dry bag of safety equipment and other bits just seemed very flat and struggled sometimes against the estuary tide flow. My sib can take up to a 10hp so any advice would be well appreciated. Thanks.
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Old 26 August 2013, 06:13   #2
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Not surprised you struggled, I would ditch the 4st and get a 9.9 hp 2st if you get a yam it is then easy to up it to a 15hp with a small mod should you want to in the future,may be able with others?
Or if you want light weight then the Tohatus 9.8hp.

Bottom line you need more power
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Old 26 August 2013, 12:48   #3
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Thanks Nick for your advice had a scout about on eBay but not much there. Thanks again.
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Old 26 August 2013, 12:53   #4
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Quote:
Originally Posted by Reaper View Post
Hi all I'm after some advice I have just returned from a holiday in Dawlish and took my 2.9 Mt Proshore sib out for its first sea trip at Teighmouth and was disappointed in my engines power performance just could have done with more speed. I have a mercury 4hp 4 stroke which is a fantastic motor for rivers and alike but at sea with two 72kg adults fuel tank and dry bag of safety equipment and other bits just seemed very flat and struggled sometimes against the estuary tide flow. My sib can take up to a 10hp so any advice would be well appreciated. Thanks.
As above, not surprised and not a safe set-up!

You need a larger SIB and engine.

Really minimum SIB recommended for sea use is 3.2m. And a 9.8 2 stroke would be the minimum power in all honesty.
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Old 26 August 2013, 16:39   #5
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Really minimum SIB recommended for sea use is 3.2m. And a 9.8 2 stroke would be the minimum power in all honesty.
Thumbs Up for that, 9.8 & 320, a perfect entry combo...

Happy Boating
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Old 26 August 2013, 17:15   #6
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As above, not surprised and not a safe set-up!
Aww cr@p! Looks like I'm snookered so...
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Old 26 August 2013, 17:21   #7
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Hi Reaper, I have the same SIB as you, mine is fitted with a 9.9 2st Johnson, performance is not a problem, planes easily 2 up, go for the bigger engine and have fun
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Old 27 August 2013, 04:01   #8
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Same here, I have a 2.85m Zodiac, with a 6hp it would plane with two people on board but took a bit of time to get going, but now I have a Tohatsu 9.8 it goes like a rocket, achieving over 18mph with two of us on board.

The Tohatsu 9.8 two stroke weighs the same as my 6hp four stroke did. I was warned about it being poor at trolling (just above idle speed) but it has regularly done 2-3 hours on the canal at 2-4mph without stalling or oiling the plugs etc.
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Old 27 August 2013, 04:23   #9
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Thanks everyone for your advice very much appreciated. Thumbs
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