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Old 10 February 2019, 07:51   #1
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outboard for 3.0 metre SIB

Hi all,
I'm thinking of a new o/b. I've got a 22 year old Honda 5 which is a bit temperamental about starting, idling, scary when you drop speed low enough to engage gear in case it stops and won't start again. It's 27 kilos plus of course non-integral fuel tank and fuel line. My back isn't what it was and a couple of years ago I had a hernia op. which I would not like to repeat!
I'm impressed by the 13 / 14 kilo weight of Yamaha / Suzuki 2.5 ish motors.
Would one of these push my 3 meter SIB around?
I might have to get over a bit of tide in the estuary (istr 1.9 kn at worst according to the chart) but generally I'm in no hurry.
Any thoughts pls?
Regards from Terry.
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Old 10 February 2019, 10:57   #2
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Hi Terry,
A 2.5hp motor should push your sib along at about 5 knots max. Will probably do that speed from around half throttle. Even at full throttle, apart from much more noise, probably won’t go any faster as limited to max displacement speed of hull.
You really need to decide if this will be sufficient for the prevailing wind/tidal conditions in your area.
Currently the lightest at around 13kg are the Honda 2.3 and Suzuki 2.5. The rest, Merc/Mariner/Tohatsu and Yamaha 2.5’s are all slightly heavier at 17kg.
Merc/Mariner/Tohatsu (all the same motor) also do a 3.5hp version which is the same block and weight at 17kg.
Hope some of that helps.
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Old 10 February 2019, 11:05   #3
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Hi Terry,
If you want light weight and a little more power per kilo you could obtain a 3.5/3.3 2 stroke as i think these are around the 13 kg range
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Old 10 February 2019, 11:55   #4
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OMO you don't have much left in terms of power with a 2.5 personally I woul be looking at something like this 10 kg more in weight but a good sack barrow would sort the lifting out

Ron Hale Marine Ltd - Yamaha 8CMHS
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Old 10 February 2019, 12:55   #5
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outboard for 3.0 metre sib

Hi guys,
That looks a good motor Jeff - and I do have a sack barrow as it happens :-)
Stubber, yes 2-strokes were more power to weight but afaik would have to be 2nd hand now.
chipko - thanks for the info. Say we stick with 2.5 (everything's a compromise) then Honda, Suzuki, Yamaha - which do you think is best? I'm leaning towards the Yamaha cos it looks like you can lie it down on front, LH or RH sides to transport it.
Regards
Terry.
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Old 10 February 2019, 13:11   #6
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outboard for 3.0 metre SIB

Nowt to choose between the big 5 makes to be honest.
The little Honda’s air cooled but noisy and no gears...centrifugal clutch.
Suzuki is lightest motor with a gearbox.
The Merc/Mariner/Tohatsu are the most powerful in 3.5 guise.
The Yam is possibly the quietest, but not by much, and if you like the facility to lay on any side, then all good.
If you fancy more power then the legendary Tohatsu 9.8 two-stroke weighing in at a poultry 26kg is the way to go. Allegedly, you can even buy ‘cheeky’ new ones from some sources.
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Old 10 February 2019, 13:12   #7
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I used to do long days of scuba diving on a larger SIB with a 3hp 2 stroke motor. That was me and full diving gear and safety gear on sheltered coastal water: Scottish sea lochs etc. I once did 24 miles in a lazy day on the sea lochs with that motor.

I now have a 310 SIB and it will proceed nicely up the river Trent against the current with a Torqeedo electric motor which is "nominally" 1.5 hp.

If you don't want to plane or to fight strong headwinds or currents, you can get away with a very small motor indeed on a 3 metre SIB.
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Old 10 February 2019, 13:29   #8
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outboard for 3.0 metre sib

Mikefule, thanks, I'm likely to be just in sheltered waters. I'll also have a look at your book.
chipko, thanks, I'll dig around on prices, looks like it might be just down to that. But re the Honda, I don't want noise,and not having a reverse sounds bad enough (but I'll have to accept that at this o/b size), but not having a neutral I don't fancy!
Regards,
Terry.
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Old 10 February 2019, 15:12   #9
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Actually it might come down to a dealer who will give me some PX - locally a place offered me some money for the old Honda 5 so that could be a factor
Terry.
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Old 10 February 2019, 17:36   #10
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outboard for 3.0 metre sib

Ah chipco, what about Mariner 3.5? 17kg, says it can be laid down on 3 sides ....

Regards from Terry.
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