Cheap outboard for aux?

Bucksribster · 22 July 2019, 14:25

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.

craig_c · 22 July 2019, 16:55

£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...

Poly · 22 July 2019, 17:11

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.

Nos4r2 · 22 July 2019, 17:17

The idea of an auxiliary is that when your main engine stops, the aux ALWAYS works.

(I'll just leave that there...)

Bucksribster · 22 July 2019, 18:05

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.

Poly · 22 July 2019, 18:15

Quote:

Originally Posted by Bucksribster

Thanks guys. £200 would not buy a new Suzuki / Yam / Mariner, and it would weigh more.

I think Craig was suggesting that a 200 used one would likely be way more reliable.

spartacus · 22 July 2019, 18:43

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.

Locozodiac · 22 July 2019, 18:52

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

Last Tango · 22 July 2019, 18:59

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.

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.

HDAV · 22 July 2019, 22:41

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...

Bucksribster · 22 July 2019, 22:52

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?

nocando · 22 July 2019, 23:13

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?

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?

beerbelly · 23 July 2019, 06:58

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

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

jeffstevens763@g · 23 July 2019, 11:57

bigger HP is better but getting it on the transom is the problem for most boats

Bucksribster · 24 July 2019, 08:04

So what auxs’ have people used on a ribcraft 585 then?

Iankristy · 24 July 2019, 08:18

Quote:

Originally Posted by Bucksribster

So what auxs’ have people used on a ribcraft 585 then?

I have a Suzuki 8hp 4stroke for sale used on a 7.8. Prob done less than 10 hours

Iankristy · 24 July 2019, 09:01

Notice the cheapie doesn’t have reverse either. Could get interesting [emoji51]

Bucksribster · 24 July 2019, 11:02

Quote:

Originally Posted by Iankristy

I have a Suzuki 8hp 4stroke for sale used on a 7.8. Prob done less than 10 hours

Thanks, but I suspect it would be too big / heavy for a 585.

Phil M · 24 July 2019, 12:16

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

AndyMc · 24 July 2019, 13:03

Quote:

Originally Posted by Bucksribster

So what auxs’ have people used on a ribcraft 585 then?

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.