Yamaha 25hp (2stroke)? Nissan 18hp(4stroke)? Honda 15hp(4stroke)?

Spidybot

Lieutenant Commander
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Apr 4, 2002
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Opinions are plenty in the 2 stroke vs. 4 stroke discussion. A search on the forum would return lots of hits.<br /><br />First of all you must know the boat recommended max hp and motor weight. Beaching really does make one think about weight - in this case a difference of almost 50% between two of the mentioned brands. Also a concern when handling the motor in other situations (storage, transportation).<br /><br />In general, the 4 stroke's are more pleasant to be with, are heavier, burn less fuel, cost more, runs more quiet (at least below full flat out), vibrates less. If EFI equipped they start easier and always idles like a dream.<br /><br />2 strokes have a hard time keeping the emission laws although they are way better than the older ones. New systems come up, but think about buying a brand new technology...<br /><br />If you do any troling a 4 stroke will handle this better. No plug fouling (as there is no oil residues in the combustion chamber).<br /><br />Access to service should be considered. A reliable and skilled workshop nearby is important should anything need fixing. Cost is an issue as well - bear in mind that not many actually pay the listed price as 'specials' occur all the time (ask for it - the dealer may not mention it if not asked).<br /><br />Depending on the area you are in, even Tohatsu could be considered. They are known to be of good service to professional users and are not too difficult to service yourself (rumour has it, that Tohatsu actually make the majority of small outboard engines for the big brands to sell under their own names).
 

cmnalo

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Oct 25, 2003
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Yamaha 25hp (2stroke)? Nissan 18hp(4stroke)? Honda 15hp(4stroke)?

I'm tring to choose a motor to go with a 12' APEX rib. I want to use to boat to travel out to the local reef to dive, surf, etc. I would also like to use the boat to pull surfer behind (Skurfing). I used to own a Achilles 12' inflatable with a Tohatsu 18hp 2 stroke. This set up was more than enough power. Any help that someone can give me creating a comprable set up with the APEX rib would be greatly appreciated. I welcome any other comment or suggestions as well. As you can see by my subject heading I'm tossing around the idea of 4 stroke vs. 2 stroke. My biggest limiting factor is cost. However, I don't want to buy to weak of a motor either. This setup will be beach launched so weight is a limiting factor as well. These three motors are what I have narrowed it down to. I'm also curious about the Nissan 18hp 4 stoke. It is basically the same engine as the 15hp would I be jut wasting money on those 3hps or would it make a difference. Nissan 18hp specs Yamaha specs honda specs
 

JB

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Mar 25, 2001
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45,907
Re: Yamaha 25hp (2stroke)? Nissan 18hp(4stroke)? Honda 15hp(4stroke)?

UU hasn't said it all, but I don't know what he left out.<br /><br />Don't consider a 4 stroke in that range "portable" unless you are quite strong.<br /><br />I think all engines available, 2 or 4 stroke, are good engines, but I am impressed with the reliability record of Tohatsus.<br /><br />Good luck. :)
 

josip_voyager

Seaman
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Jun 23, 2003
Messages
56
Re: Yamaha 25hp (2stroke)? Nissan 18hp(4stroke)? Honda 15hp(4stroke)?

See the tech. spec. for Honda BF 20. This 4 stroke engine is the lightest outboard on the world in his class among 4 strokes and 2-STROKES outboards (for example Yamaha F 25 is 50% heavier and Mercury 20 2-stroke is 14% heavier). So, I disagree with JB that if you choose portable 2 strokes that you would have a good muscle. There are exceptions. Honda has proved it.
 

Forktail

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Feb 11, 2002
Messages
977
Re: Yamaha 25hp (2stroke)? Nissan 18hp(4stroke)? Honda 15hp(4stroke)?

You said cost and weight are major factors, so I'd go with an inexpensive and lightweight 2-stroke. Most brands these days are good. Price and dealer/parts/warranty would be the determining factor.<br /><br />Is this a Tender or Dingy Apex Rib? The 12' Tender needs about 40 hp.
 
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