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Old 02 March 2016, 15:23   #1
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Small auxiliary engine

Hi all

I have been trying to find a small 2 stroke engine as a backup on my sib. I hadn't realised that even some 4hp engines have the option of running off an external tank, which I think could be quite handy for me.
Can anyone suggest some models I could look out for with this feature? Or does it appear on many old models as an optional extra.

Cheers

Simon
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Old 02 March 2016, 15:58   #2
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Quote:
Originally Posted by simonafloat View Post
Hi all

I have been trying to find a small 2 stroke engine as a backup on my sib. I hadn't realised that even some 4hp engines have the option of running off an external tank, which I think could be quite handy for me.
Can anyone suggest some models I could look out for with this feature? Or does it appear on many old models as an optional extra.

Cheers

Simon
just a thought, I own a little single cylinder mariner 3.5 2 stroke, is there any way to convert it to run off an external tank? I'm assuming no as it's fed by gravity.
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Old 02 March 2016, 16:26   #3
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Tohatsu outboards from 4hp up (2-stroke) feature option of connecting to external tank. Trouble is finding one. Smallest Yamaha (as far as I'm aware) would be 6hp. http://www.tohatsu-uk.net/EnginesNew/2StrokeFrame.htm

No idea about converting existing outboard to run off external tank.
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Old 03 March 2016, 03:25   #4
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Suzuki do a conversion basically it fits left-hand side front of the engine its not the same as the round Suzuki connector its the bayonet type i have one hear that i didn't use if of interest. i did my 4hp with a round connector with a quarter turn valve to shut the internal tank off cost 20 ish

cheers
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Old 03 March 2016, 03:32   #5
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4 & 5 hp single cylinder 2 stroke yamaha is the one to get probably the best engine you'll find at this size
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Old 03 March 2016, 03:38   #6
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My backup is a Suzuki DT4 4hp & that has the fittings for an external tank.
Bear in mind that these small 2-strokes are premix so if your main is 4-stroke, runs a different premix ratio or is oil injected (mine) you're going to need a separate fuel supply anyway.
Likely the fittings may not be the same as your main.
A 5 litre container doesn't take up that much room.
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Old 03 March 2016, 08:09   #7
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If you want an aux on an Aerotec then the smallest/lightest possible model is needed. Is your 3.5 like the narrow 2/2.5hp models with no gears and throttle on the cowling? That's about as large as you want to go. These will need to run off their own tanks and as said above a 5l emergency can is no hardship to carry.

Once you step up to the 4hp and above motors that can take an external tank they're getting a bit large.

This is the sort of thing I'd be looking for...
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Old 03 March 2016, 09:47   #8
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Suzuki just brought out new portable engines 4,5,6hp @ 23,5 kg can be stored on three sides port starboard or front gravity fed tank.

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Old 03 March 2016, 13:47   #9
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I've been pondering this 'aux engine' question. Having lugged a back-up with me on my first outing in the new Honwave and found it to be nothing more than a PITA - OK so it is an elec trolling motor that had to sit in the boat along with a 110AH leisure battery... but regardless of form... does one really need this if venturing no further than 1 mile off shore? Do people do this normally?

(I can see the merits if out on a solo expedition)
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Old 03 March 2016, 14:05   #10
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Originally Posted by Stigomery View Post
I've been pondering this 'aux engine' question. Having lugged a back-up with me on my first outing in the new Honwave and found it to be nothing more than a PITA - OK so it is an elec trolling motor that had to sit in the boat along with a 110AH leisure battery... but regardless of form... does one really need this if venturing no further than 1 mile off shore? Do people do this normally?

(I can see the merits if out on a solo expedition)
Would it be any good in wind and tide the trolling motor?
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