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Old 20 February 2016, 16:45   #11
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Country: UK - England
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A layman has to accept the makers HP figures and I can only agree 5hp at a 33% power increase over my 15hp should be noticeable.

As a matter of interest on SIBs of a medium size range I've come to the conclusion ideally you need 5hp per person for decent on the plane performance. We are always two up and often three... occasionally four. It does annoy me when taking that extra 4th person (guest) out the current outfit is less than impressive and it's my hope one of the 20hp positives to be weighed against... err its weight... is achieving that crew + guest performance.
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Old 20 February 2016, 20:19   #12
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Without reading all of the aforementioned discussion I would say go for the 4 stroke all day long☺
I've never looked back on either of my road motorbikes, trail bikes or outboard engines after making the transition from 2 stroke .
The extra torque and less revs = 😊
Similarly I would not go back to owning a petrol car having owned several tasty souped upTurbo Diesel marque's😛.
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Old 22 February 2016, 04:29   #13
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Originally Posted by jeffstevens763@g View Post
How much loss at the prop if the 18tested on the shaft how much nearer will it be tested at the prop to the 15 he has already OMO but 5hp will be a lot more noticeable than 2 possibly 3hp.having said that!
There's an interesting YouTube trial done in Russia of a 20hp EFI and a 15hp carb suzuki's with 3.80 m suzimar boats I was very surprised how near they were worth a look!
It's a tuff choice given space David has and a few kilos can make manageable difficult.
My bad, should have written prop shaft, because that was where from the power was measured. So its a strong little beast. For sure its more noisy than modern engines, but otherwise would think a optimal match to an aerotec.
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Old 23 February 2016, 06:01   #14
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Oh well decision made (which I'll report on in my engine thread... Suzuki DF20AS 4-stroke new - Any opinions? ) to go for the Suzuki 4-stroke. I really like the Tohatsu 18 but ideally wanted new and that was a little complex for a Tohatsu given current regs!
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Old 23 February 2016, 06:16   #15
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Oh well decision made (which I'll report on in my engine thread... Suzuki DF20AS 4-stroke new - Any opinions? ) to go for the Suzuki 4-stroke. I really like the Tohatsu 18 but ideally wanted new and that was a little complex for a Tohatsu given current regs!
enjoy David
you wont regret it its the best choice going for the 20 hp of any make you will have plenty of power to cover all your needs just hope getting it in the car works out OK

cheers
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Old 23 February 2016, 09:48   #16
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Agreed. Hope you will be as pleased with yours as we have been with ours. Click image for larger version

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Old 23 February 2016, 10:37   #17
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Thanks Chipko... remind me... did you make that wonderful trolley?
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Old 23 February 2016, 11:03   #18
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Wooohhh, Judas!

How dare ye abandon the world of 2-smokes!

I never would have thought it of you David.

But...in seriousness if there is a small 4 stroke to get that must be the one.
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Old 23 February 2016, 11:05   #19
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Well not make, but an adapted cheap dolly off eBay.
It doubles up to either move boat and motor on launch trolley or move engine on its own. Click image for larger version

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Old 23 February 2016, 14:30   #20
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>>>How dare ye abandon the world of 2-smokes!

Well yes indeed. Funny thing is the more I looked into this Suzuki 20EFI the more I realised the ideal SIB engine was a last of the Mariner/Mercury/Yamaha 15hp 2-stroke models.... and that I had a minter one of those in the garage already.

But I was on a downhill slope with no brakes so it's happened anyway!


Chipko is it based on one of these... Metal Caravan Trailer Dolly Mover - H-Duty Black - For Boat - Jet Ski - Utility | eBay

That's interesting as I was wondering about making something that would both take the outboard and alternatively hook into the bow handle of the Aerotec so it was held off the ground then when taking it along the road for a distance you are not trying to lift with your hand awkwardly behind you and pull as well.

Something similar would do the trick.
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