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22 July 2019, 14:25
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#1
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Member
Country: UK - England
Town: Thame
Boat name: Free-Flow
Make: Shearwater 6.8
Length: 6m +
Engine: Suzuki 175
Join Date: Mar 2012
Posts: 318
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Cheap outboard for aux?
Has anyone actually bought any of the cheap outboards advertised on ebay? See for example:
https://www.ebay.co.uk/itm/KRAFT-DEL...EAAOSwFLlc7o0G
On the face of it a 5.8 hp outboard, only 10kg would make an ideal aux. Probably better / lighter / more reliable than my 40-year old Johnson 4hp.
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22 July 2019, 16:55
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#2
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Member
Country: UK - Scotland
Town: Inverkip
Boat name: Crusader
Make: Redbay 8.4 Exped
Length: 8m +
Engine: yamaha sterndrive
Join Date: Nov 2004
Posts: 755
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£200 gets you a mariner/Suzuki/Yamaha 4hp longshaft
always works a treat, even on an 8m cabin boat
you always see these popping up and IMO they look rubbish,
watched a video about some yanks buying them on amazon, they had to fix it before it would run
same with parsuns, why are they always for sale non running...
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2006 Redbay 8.4 Expedition "Crusader"
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22 July 2019, 17:11
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#3
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,639
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Even if you feel tempted - look at the spec in terms of CC, HP, RPM etc and compare to both some strimmers and well known outboards. I suspect the HP outputs are just made up not validated.
If you do go this way - but some ear defenders - air cooled = deafening.
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22 July 2019, 17:17
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#4
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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The idea of an auxiliary is that when your main engine stops, the aux ALWAYS works.
(I'll just leave that there...)
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22 July 2019, 18:05
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#5
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Member
Country: UK - England
Town: Thame
Boat name: Free-Flow
Make: Shearwater 6.8
Length: 6m +
Engine: Suzuki 175
Join Date: Mar 2012
Posts: 318
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Thanks guys. £200 would not buy a new Suzuki / Yam / Mariner, and it would weigh more. I had an old long shaft Yam 5hp once, but it would not fit onto the transom of my RC585 directly, and it was pretty heavy. The old Johnson I have is a bit lighter, but it is a b***er to start sometimes, and I doubt it is still pushing out 4hp.
Take Poly's point on HP etc. Might look into that. For an aux, noise is probably not a big problem.
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22 July 2019, 18:15
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#6
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,639
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Quote:
Originally Posted by Bucksribster
Thanks guys. £200 would not buy a new Suzuki / Yam / Mariner, and it would weigh more.
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I think Craig was suggesting that a 200 used one would likely be way more reliable.
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22 July 2019, 18:43
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#7
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Member
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 70hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 4,663
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Ah, the old auxilliary engine question!
There's no point trying to save money or cut corners on your back-up engine.
2-stroke and 4-stroke outboards are perfectly serviceable, even if they're old. My Mariner 4hp (2-stroke) purrs like a kitten! In the years I've had it's failed just once on a test start with a blocked impeller (salt build up). I now run it in fresh water regardless if I've used it and service it annually.
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Is that with or without VAT?
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22 July 2019, 18:52
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#8
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Member
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider 450 Rib
Length: 4m +
Engine: Tohatsu 5/18/30 HP
Join Date: Sep 2007
Posts: 1,998
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You guys boat on rough water cond most of the time, if so, a 4 HP is a very poor aux specially if facing strong currents, winds, rough water cond. Personally would go straight for a 2 strokes 9.8 HP motor with a maximized prop (less pitch prop) to pull wot revs towards max wot rpm range factory stated to push combo much better at fast displacement speed.
A 2 strokes 4-5 HP are around 100 CC compared to 170 CC of a 8-9.8 HP motor.
Happy Boating
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22 July 2019, 18:59
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#9
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Member
Country: UK - Scotland
Town: Denny
Boat name: Highland Bluewater
Length: 6m +
Join Date: Mar 2013
Posts: 1,647
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Quote:
Originally Posted by Bucksribster
Has anyone actually bought any of the cheap outboards advertised on ebay? See for example:
https://www.ebay.co.uk/itm/KRAFT-DEL...EAAOSwFLlc7o0G
On the face of it a 5.8 hp outboard, only 10kg would make an ideal aux. Probably better / lighter / more reliable than my 40-year old Johnson 4hp.
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I know Duncan's were left with few of these and they took a "hit" on them because they proved to be that unreliable they felt it would be wrong to sell them to anyone.
Old small outboards run forever if they're looked after. You'd be much better off with and older "brand name" motor.
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22 July 2019, 22:41
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#10
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Member
Country: UK - Wales
Town: Cardiff
Length: no boat
Join Date: Aug 2014
Posts: 2,018
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How do they get that much more power out of the same displacement compared to a stihl chainsaw? 4.3kw? Stihl 58cc saw are 3.5kw that’s a 20% more power?
Also parts for these types are expensive and required frequently if the strikers etc are anything to go by.... the orange casing is a nice touch...
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22 July 2019, 22:52
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#11
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Member
Country: UK - England
Town: Thame
Boat name: Free-Flow
Make: Shearwater 6.8
Length: 6m +
Engine: Suzuki 175
Join Date: Mar 2012
Posts: 318
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Looking at the spec, it is only 60 cc, so it is hard to see how they get so much power out. Probably not a realistic performance then.
A 4 hp yam/ mariner/ suzi i guess will be heavier than my Johnson? What would be the best power to weight outboard then?
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22 July 2019, 23:13
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#12
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Member
Country: UK - Scotland
Town: Glasgow
Make: Excel Vanguard 395
Length: 4m +
Engine: Suzuki 20
Join Date: Jan 2012
Posts: 79
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Quote:
Originally Posted by Bucksribster
Looking at the spec, it is only 60 cc, so it is hard to see how they get so much power out. Probably not a realistic performance then.
A 4 hp yam/ mariner/ suzi i guess will be heavier than my Johnson? What would be the best power to weight outboard then?
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A "good" 60cc engine will make 5hp easily but they cost far more than this entire outboard. The problem is the lack of torque so you need to spin them upto high revs to get max HP. due to said lack of torque they are not best suited to an outboard I would not think.
What about a mariner 3hp or similar?
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23 July 2019, 06:58
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#13
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Member
Country: UK - England
Town: teesside
Boat name: magic
Make: humber 5.5
Length: 5m +
Engine: mariner 115
MMSI: 232012453
Join Date: Apr 2014
Posts: 1,565
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Quote:
Originally Posted by Locozodiac
You guys boat on rough water cond most of the time, if so, a 4 HP is a very poor aux specially if facing strong currents, winds, rough water cond. Personally would go straight for a 2 strokes 9.8 HP motor with a maximized prop (less pitch prop) to pull wot revs towards max wot rpm range factory stated to push combo much better at fast displacement speed.
A 2 strokes 4-5 HP are around 100 CC compared to 170 CC of a 8-9.8 HP motor.
Happy Boating
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he has a point I had a brand new mariner 4hp 4stroke that I tried on my 5.7 valiant on a mirror glass flat calm windless day and it made 4.5 knts I figured throw in a bit of chop and a head wind and its going nowhere so I sold it and bought a very good second-hand 8hp mercury 2 stroke haven't tried it yet but im confident it will be better
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23 July 2019, 11:57
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#14
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Member
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,534
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bigger HP is better but getting it on the transom is the problem for most boats
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24 July 2019, 08:04
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#15
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Member
Country: UK - England
Town: Thame
Boat name: Free-Flow
Make: Shearwater 6.8
Length: 6m +
Engine: Suzuki 175
Join Date: Mar 2012
Posts: 318
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So what auxs’ have people used on a ribcraft 585 then?
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24 July 2019, 08:18
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#16
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Member
Country: UK - Scotland
Town: Scotland
Boat name: Clyde adventurer
Make: Humber
Length: 8m +
Engine: Twin Merc 150 4str
Join Date: May 2015
Posts: 472
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Cheap outboard for aux?
Quote:
Originally Posted by Bucksribster
So what auxs’ have people used on a ribcraft 585 then?
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I have a Suzuki 8hp 4stroke for sale used on a 7.8. Prob done less than 10 hours
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24 July 2019, 09:01
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#17
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Member
Country: UK - Scotland
Town: Scotland
Boat name: Clyde adventurer
Make: Humber
Length: 8m +
Engine: Twin Merc 150 4str
Join Date: May 2015
Posts: 472
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Notice the cheapie doesn’t have reverse either. Could get interesting [emoji51]
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24 July 2019, 11:02
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#18
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Member
Country: UK - England
Town: Thame
Boat name: Free-Flow
Make: Shearwater 6.8
Length: 6m +
Engine: Suzuki 175
Join Date: Mar 2012
Posts: 318
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Quote:
Originally Posted by Iankristy
I have a Suzuki 8hp 4stroke for sale used on a 7.8. Prob done less than 10 hours
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Thanks, but I suspect it would be too big / heavy for a 585.
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24 July 2019, 12:16
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#19
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Member
Country: UK - England
Town: Whitehaven
Boat name: Cerberus
Make: Destroyer 5.8
Length: 5m +
Engine: 115hp Merc 4st
Join Date: Oct 2012
Posts: 462
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I have a tohatsu 6ph 4st on my Destroyer 5.8. Not the same boat but similar size. It has less than an hour on the aux so I haven't had it to full throttle yet to test top speed but it moves the boat around the marine easily.
Phil
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24 July 2019, 13:03
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#20
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Member
Country: UK - England
Town: Lincoln
Boat name: Ace of Spades
Make: RIBCRAFT
Length: 5m +
Engine: 140
Join Date: Aug 2017
Posts: 9
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Quote:
Originally Posted by Bucksribster
So what auxs’ have people used on a ribcraft 585 then?
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I've got a Suzuki 6hp on mine. It fits next to the 140HP ok, but I'm not sure anything much bigger would fit without causing issues.
It pushes the boat along at 6knts WOT on flat water. About 4knts when dialed down to about 3/4 throttle. Personally, I wouldn't want to go with anything much smaller than that.
BTW, the previous owner ordered the boat from Ribcraft with the aux already installed. However, I don't know whether it was him or Ribcraft that came up with the engine choice.
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