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Old 20 April 2014, 16:34   #1
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Make: Zodiac MKII
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Engine choice for 4.2m Zodiac MKII

Whats your opinion?

I just purchased an unused zodiac MKII 4.2m SIB, which I am going to use for hunting birds in the archipelago and to bring on spearfishing trips to Norway. I still havent bought an engine for it but I want a standard tiller outboard.

The way I figure my engine needs/requirements are as follows:
1. The SIB will be deflated and packed for transport and engine mounted/demounted so engine weight and "handleability" plays an important role.
2. The SIB needs to get up on the plane with four people aboard in calm waters so that getting around to the different sites doesnt take too long.


It would be interesting to hear your opinions regarding engine size and make/model. So far I have been looking at yamahas 2stroke autolube models from 1990 and forwards. Any thought on these? Im thinking 30 hp but my neighbour who has had a few RIBs and SIBs tells me the rubber bottom has more drag and will require more power than an RIB, which is why he recommends that I get a 40 hp.

Thank you for your time.
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Old 20 April 2014, 17:05   #2
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Country: UK - England
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Boat name: Wine Down
Make: Maxum
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Ive had a couple of futura's, a 3.8 fastroller and a 4.2 Sport. They are lightweight boats and plane easily. I used a 15 and a 25 with the 3.8, both worked well and in fact the 25hp was overpowered if it was lightly loaded.

The 4.2 Sport had a 2 stroke 50hp Yamaha and it was seriously quick, pulling a mono skier with ease from a deep water start.

I think your biggest issue will be portablility, a 25hp 2 stroke weighs about 45kg, it can be handled with difficulty by 1 person. A 30HP is usually 3 cylinder and significantly heavier but about the same weight as a 40hp. I think a 25hp will do the job, mine will plane a 4m HonWave with 4 big adults on board. If you are leaning towards the 30hp, you might as well get a 40jp because it will be virtually the same weight.
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Old 20 April 2014, 17:15   #3
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Good point! Probably a good idea to stay with 2 cylinders then...
Any specific brand or model to look for, or to look out for!?
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Old 20 April 2014, 17:29   #4
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Just my personal opinion, but I love pre oil injection 2 cylinder Yamaha's, either the 20 or 25hp versions (The Mariners of the same era were identical).

The slightly newer Mercury/Mariner 25hp are also good, but a bit heavier.
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Old 20 April 2014, 23:33   #5
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I use both a Evinrude 15hp 2 stroke and a Johnson 30hp 2 stroke with my mkII. The 15 is nice for light loads when I don't want to hump the 30hp around. For much more than two people with little gear the 30hp is required, it is at the limit of what I can handle as a removable motor for beach launching.
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Old 21 April 2014, 01:15   #6
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I have a 40HP, 2 stroke, 2 cylinder, Evinrude, mounted to a 4.2m Futura Sport GT. It lives on a trailer. There is NO WAY I would dismount the motor every time. I use a cherry picker to pick it up when I do need to remove it. You need to be reasonable about what you can easily lift, as a motor is fairly awkward to handle.

You are probably going to want the largest heavy duty transom wheel setup you can get to help get it in and out of the water. It is not a boat that a couple of guys can just pick up and throw in the water.

An electric air pump will make blowing the boat up far more enjoyable too.
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Old 21 April 2014, 02:38   #7
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Make: Ribcraft 4.8m
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Engine: Tohatsu 60hp + aux
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RIBase
Used to have a Yamaha 25D (2-stroke) on a Zodiac MKIIC (3.8m) which was perfect. If you're heading out yourself, I'd suggest a bag of sand secured up front as ballast. 25hp is as big as I'd go to lift. Also had a Yamaha 40V (2-stroke). Beautiful no-nonsense engine, but not easy to man-handle on your own.
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Old 21 April 2014, 03:11   #8
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Make: Lodestar
Length: 3m +
Engine: Yamaha 30hp 2stroke
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Hi
I use a 30hp 2 cyl 2 stroke premix yamaha (30gmh I think the engine code is ) on my lodestar 380 air floor . I pack the boat away after use and transport it in a mazda bongo as I don't have the space to store it fully inflated ,and I find I can move it in and out of the bongo ok by myself ( I am fairly fit but certainly not the strongest guy around) .there is a technique to learn and I use a modified sack barrow at home and I use my launch wheels to get the boat as close to the back of the car as possible . I really like the engine it has good power and has been totally reliable and being a premix 2 stroke there is no oil to spill when it is laid on its side.
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Old 21 April 2014, 13:38   #9
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Thank you all very much for your valuable inputs!
I now think a 25hp 2cyl 2stroke will have to do.

About transomwheels and electrical pumps, any info on what brand/model to look for? A good dealer in europe?
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Old 21 April 2014, 16:53   #10
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If portability it's a must go for a 30 HP engine, are same size and weight of their younger 25 HP brother. Will benefit having that extra 5 HP if boating with 4 mates. Check 2 strokes Tohatsu 25 HP which could be converted to a 30 HP for candy cost.

If sib's tubes and keel are correctly inflated to at least 3.0 PSI while resting on water, lower fabric drag will pass near unoticeable. Just pump it up baby, pump it up....

Happy Boating
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