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Old 13 June 2015, 03:04   #1
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Would a 90hp 4 stroke be enough?

Would a 90hp 2stroke be enough?

What's the max hp allowed on them?
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Old 13 June 2015, 03:29   #2
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Apparently it can take up to 150hp maximum. That might be a tad excessive for a sub 6m rib. I suppose it's all down to use, number of people on board, weight you're carrying, etc. Having said that, it still weighs in at 390kg.

Suzuki DF140 should be in your mix at 186kg. They do come up occasionally for sale second-hand.

New Yamaha F115 weighs in at 171kg, and F150 at 218kgs.

Old school Yamaha 90hp oil-burner is a mere 120kg.

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Old 13 June 2015, 03:30   #3
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Quote:
Originally Posted by HUMBER P4VWL View Post
Would a 90hp 4 stroke be enough?

Would a 90hp 2stroke be enough?

What's the max hp allowed on them?

You been in the sauce HP ...


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Old 13 June 2015, 03:55   #4
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Nah, a mate is looking. There's a nice one on ebay with a 115 4s and an older one with a 90 Honda. Can't help but feel an almost 6m with a Honda 90 4s could be a bit wheezy.
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Old 13 June 2015, 04:15   #5
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I'd want more than 90 on a 585. I have 100 on my 5.3. The 585 is rated to 150, but a 140 seemed to be the most popular engine.
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Old 13 June 2015, 04:55   #6
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My thoughts too, 90 is going to be working hard a lot of the time. 115 would be ok I guess, but 140 ideal, though likely heavier i suspect.
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Old 13 June 2015, 05:04   #7
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I went on a BIBOA. Cruise many years ago and there was a 585 with a Mariner 90 4 stroke. It was adequate for cruising about but that's it
Our 5.4 sea rider ran rings around it.

What is the thinking on the power of a 140 Suzuki? 126hp?
Many had those and went really well. So, perhaps a 115hp would be good.
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Old 13 June 2015, 05:07   #8
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And good they are with 150's. I've just changed from a Mariner 250 two stroke to a Merc 150 fourstroke


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Old 13 June 2015, 05:41   #9
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Paul , I have had the same rig for over 12 years now . I run quite heavily laden with fuel ( plus me and crew ). We can cruise happily all day at 25knts and max out at 34 under ideal conditions. Average the ubiquitous 1 litre per nm.

Sure there are occasions when a few more horses would not go amiss but if you search back through the archives there was a suggestion that if wrongly set up or trimmed , a 150 could make a 585 chine walk . Regards Bern
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Old 13 June 2015, 06:22   #10
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Cheers Bern. It'd be my mate's first boat so I think a 150 would be too much. Whilst he's 6ft3 and has two boys 8 and 10, he's not carrying divers and the like. It'd be for fairish weather boating, pulling toys and cruising about. I think the one with a 115 4s would a good set up. Ideally a 140 4s but heh, it'd be more and there isn't one on the market!
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