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Old 13 February 2010, 04:41   #11
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The ebay one? Yes the e-bay one.

You'll be lucky if you get anything bigger than 2hp on there without an aux bracket-which will stick out quite a long way astern. All I can get on my transom alongside the Yam and with an A-frame is a DT2.2. Even the old 4hp Evinrude twin or a Seagull (both very narrow) won't

Thanks this is helpful. I have an old Seagull and was going to give it a try so I'll have a rethink. What do you suggest I look for? I have an aux bracket.
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Old 13 February 2010, 04:57   #12
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Biff was more than happy that our little 3.5 aux would get us out of trouble if needs be - we have a 5.4m Searider, he is currently fitting an aux bracket which required some clever work as there isn't really room to mount it next to the main outboard.

From our experience of the main engine failing the aux would have got us to a safe haven to moor and wait for help - so from our experience much recommended
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Old 13 February 2010, 05:08   #13
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Country: UK - Scotland
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Boat name: Sula
Make: Ribcraft 4.8m
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I have a Tohatsu 3.5hp on the back of the Zodiac Pro 4.2m. It's mounted on a Plastimo stainless steel bracket. The bracket itself had to be altered slightly due to the angle of the stern to get it over the side. The nylon auxilliary transom plate then had to be removed and cut down to size so I can turn the main engine hard lock both ways. Rattles about when in the raised position so I attached a ratchet strap to tension it underway. In the down position I can fix it in a straight ahead position and steer with the main engine. Does the job, but again I really need to test it throroughly, so I know what to expect.

Was looking for a Yamaha 4hp (2-stroke), but this proved difficult to find in a reasonable condition. The Tohatsu 4hp 4-stroke is simply too wide. The 3.5hp Tohatsu is slim and lightweight, hence my decision.
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Old 13 February 2010, 05:13   #14
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Boat name: WhiteNoise/Dominator
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Originally Posted by Swordfish View Post
The ebay one? Yes the e-bay one.


Thanks this is helpful. I have an old Seagull and was going to give it a try so I'll have a rethink. What do you suggest I look for? I have an aux bracket.
Is the bracket already fitted? If so, I'd be looking at a 3.5 to 4hp 2 stroke. much more weight offcentre and behind the main engine will be noticeable.

Is your DT115 premix or autolube? If it's premix, get an aux that runs on the same premix as the main engine. There's various easy options for refuelling it then. What I've done is put a fuel connector on a bit of pipe so I can refuel the inbuilt tank using the primer bulb.

<edit> Just looked at pic of your boat I think-is it the one from Scotland? If it is, make sure any aux you get can't hit the tubes with the prop.
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Old 13 February 2010, 05:41   #15
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Hi,
I have asked about aux's on my boat before and been told it wasn't a good idea by people with much more experiance than me. But it is always something that bothers me, especially as this year I will be going further afield with my new boat and unknown engine. I wouldn't want to rely on my rowing ability to get me to safety either.

I have a Tohatsu 9.8hp from a smaller sib I have, and I intend taking it out with me when I go out on my 4.5m sib. The boat currently has a 25hp engine on that I have been told is a good runner by the person who serviced it.

I have bought an outboard bag for the 9.8hp, and intend to strap it down securely. This would hopefully stay dry and not bounce about. I would carry two 12L fuel tanks as both engines are a 50:1 mix. The tanks will give me a good range, and prevent fuel problems.
If I encounter a problem when out, I can (hopefully) remove the 25 and fit the 9.8.
Also, when on holiday in Scotland, if one breaks down I am not scuppered for the holiday. I think the 9.8 will still shift the boat, just not warp speeds.

What do you think of this idea?
Also, when using a 25hp engine, does it have to be bolted to the transom? Obviously it would be tied to the transom, and secured with the thumb screws.
Cheers,
Geoff
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Old 13 February 2010, 05:58   #16
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Hi,
I have asked about aux's on my boat before and been told it wasn't a good idea by people with much more experiance than me. But it is always something that bothers me, especially as this year I will be going further afield with my new boat and unknown engine. I wouldn't want to rely on my rowing ability to get me to safety either.

I have a Tohatsu 9.8hp from a smaller sib I have, and I intend taking it out with me when I go out on my 4.5m sib. The boat currently has a 25hp engine on that I have been told is a good runner by the person who serviced it.

I have bought an outboard bag for the 9.8hp, and intend to strap it down securely. This would hopefully stay dry and not bounce about. I would carry two 12L fuel tanks as both engines are a 50:1 mix. The tanks will give me a good range, and prevent fuel problems.
If I encounter a problem when out, I can (hopefully) remove the 25 and fit the 9.8.
Also, when on holiday in Scotland, if one breaks down I am not scuppered for the holiday. I think the 9.8 will still shift the boat, just not warp speeds.

What do you think of this idea?
Also, when using a 25hp engine, does it have to be bolted to the transom? Obviously it would be tied to the transom, and secured with the thumb screws.
Cheers,
Geoff
If you're set on it,I'd buy a 4hp as an aux. Sod's law says if your main engine breaks down, it'll be too rough to lift a 9.8hp onto the transom without losing it.
Ref bolting the 25 on,will you need to move it to one side to steer an aux properly?
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Old 13 February 2010, 06:27   #17
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I am keen on not buying another engine, unless I see one at a bargain price. Also I don't want to sell the Tohatsu 9.8hp as it is a good engine, and really light for its horse power (a two stroke).
I would have to remove the 25hp engine to use another. Both engines are two stroke, the 9.8 is light, the 25 has lifting handles on the side by the cowling. I often lift the 25 onto a bin to run it. I realise it would be a different kettle of fish on by boat, but do you think it is do-able?
Do you think the engine will get damaged strapped down?
And is the stress too much on thumbscrews alone, not bolts?
Thanks for taking the time Nos.
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Old 13 February 2010, 06:43   #18
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Originally Posted by Geoff_Jubb View Post
I would have to remove the 25hp engine to use another. Both engines are two stroke, the 9.8 is light, the 25 has lifting handles on the side by the cowling. I often lift the 25 onto a bin to run it. I realise it would be a different kettle of fish on by boat, but do you think it is do-able?
No. Absolutely not.Forget taking the 9.8. You'll end up going in head first trying to lift the 25 off.
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Do you think the engine will get damaged strapped down?
I suspect in a sib, it'ls more likely to come loose and very likely soaked.
Quote:
Originally Posted by Geoff_Jubb View Post
And is the stress too much on thumbscrews alone, not bolts?
Thanks for taking the time Nos.
Nah, thumbscrews are fine as long as you do them up really tight, wiggle the engine about to see if they move/reseat then tighten them again.
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Old 13 February 2010, 15:45   #19
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Country: UK - Scotland
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No. Absolutely not.Forget taking the 9.8. You'll end up going in head first trying to lift the 25 off.
Have to agree. It's one thing lifting a 25hp on the the slipway, quite another in anything other than a flat calm sea, especially if you're under pressure to switch engines.

Even if the 9.8hp was in a bag, it will rattle like a box of spanners. A Yamaha 4hp 2-stroke or Tohatsu 3.5hp would be better.
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Old 16 February 2010, 06:33   #20
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sneaky plug... 4hp 2 stroke LS Yam

http://rib.net/forum/showthread.php?t=34311

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