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Old 03 May 2011, 15:27   #1
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auxillary??? 5.4 searider follow up

firstly thanks for all the advice on single or twin posting for my 5.4 searider, now if i go down the single 90hp route, what size back up engine do i need? 3hp? 4hp? etc etc,..... thanks in advance again...fatboyrib
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Old 03 May 2011, 16:01   #2
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Work on 1hp per metre.
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Old 03 May 2011, 17:12   #3
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Get your single 90 on there first and work out what'll fit before buying. There's very little room on the transom of a 5.4-specially if you've got an A-frame.
You'll probably find 4hp is the biggest you can actually fit.
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Old 04 May 2011, 16:05   #4
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Try a 4hp. It will be ample and push you along at 4-5knts. Plus it will run on its own integral fuel tank or can be taken from the main fuel tank (if not contaminated, hence possible problem in the first place)
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Old 05 May 2011, 17:28   #5
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I have a 8A hp yamaha on the back of mine with a A frame fitted. Pushes along at 4-5mph.
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Old 05 May 2011, 17:34   #6
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I'd be interested to see how you've done that. Got pics?
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Old 05 May 2011, 17:57   #7
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Originally Posted by benjytaylor View Post
Try a 4hp. It will be ample and push you along at 4-5knts. Plus it will run on its own integral fuel tank or can be taken from the main fuel tank (if not contaminated, hence possible problem in the first place)
Is that a standard shaft Yammie auxilliary?
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Old 06 May 2011, 03:08   #8
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The other one to think aboput (and this brings a whole discussion in itself) is that the old OMC 2-pot 4Hp of '66-75(ish) is remarkably narrow (and light - only 13KG). The reason they are so narrow is that they don't have a twist grip throttle poking out the side - the tiller is fixed underneath the cowl and it has a "front panel" throttle.

The main down side to those engines is that you aren't going to get one younger than 35 years old. They do appear on Fleabay with monotonous regularity tho'.
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Old 06 May 2011, 04:11   #9
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benjytaylor - how you lift your auxillary when you are on the water?
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Old 06 May 2011, 04:11   #10
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crazymac680 - do you have any pictures?
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Old 06 May 2011, 06:43   #11
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The other one to think aboput (and this brings a whole discussion in itself) is that the old OMC 2-pot 4Hp of '66-75(ish) is remarkably narrow (and light - only 13KG).
...as is the Merc/Mariner Twatsoo 3.3/3.5hp whisk. Available in the UK until a couple of years ago (and probably still available to commercial users). Fits nicely on the transom of an SR4.7/5.4 with A frame.

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Old 06 May 2011, 06:59   #12
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...as is the Merc/Mariner Twatsoo 3.3/3.5hp whisk. Available in the UK until a couple of years ago (and probably still available to commercial users). Fits nicely on the transom of an SR4.7/5.4 with A frame.
Not, unfortunately if it's got the military A-frame mounted on the outside.
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Old 06 May 2011, 07:50   #13
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...as is the Merc/Mariner Twatsoo 3.3/3.5hp whisk. Available in the UK until a couple of years ago (and probably still available to commercial users). Fits nicely on the transom of an SR4.7/5.4 with A frame.

You won't be surprised to hear that was my other option, I just tripped over the Johnsorude first!
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Old 06 May 2011, 08:08   #14
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You won't be surprised to hear that was my other option, I just tripped over the Johnsorude first!

I think some of the Johnnyroods were also re-branded Twatsoo 3.5hp whisks. These are a touch narrower than the old 2-cyl 4hp motors.
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Old 06 May 2011, 08:09   #15
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Not, unfortunately if it's got the military A-frame mounted on the outside.
I suppose the military boats never break down.
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Old 06 May 2011, 11:39   #16
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As long as you get a 2 stroke 2/3.3hp (mariner, yamaha suzuki etc) The engine will fit nicely on the side of the main, either on the transom or on a drop aux bracket. 4 Stroke's are a little on the big side and add a good 30kg to the rear. All of my seariders have a 4hp 4 stroke aux fitted to them. The one in the picture is a fixed bracket that came with the boat. I can only half tilt the engine up, but it does the job. My others use an adjustable bracket . Try one of these - NEW outboard engine lowering bracket 30kg max 8-10hp on eBay (end time 07-May-11 08:13:17 BST).
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