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Old 30 September 2013, 13:11   #1
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4 or 2 stroke.

I'm new to this forum and I am sure this has been asked before, but what do you all recommend. Currently I have an XPro 3.8m sib, with a 9.9hp mariner long shaft engine 4 stroke. Very nice engine but a long shaft, so looking at changing to a short shaft 15 or 20 hp next year, but should I steer away from 2 stroke and stick with 4.
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Old 30 September 2013, 13:23   #2
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Wlcome to Ribnet!

High level summary:

2- stroke = lighter weight to lug around
4- stroke = quieter, less smelly & if you do a lot of low speed stuff - more fuel efficient.

These of coures are big generalisations, and if you love the smell of a cold 2- stroke in the morning then it's a done deal!


Humour aside, one thing to watch is that the definition of "long" changes somewhere in the HP teens. I assume from your comment that you have found that out already, but thought it best you hear it twice than find your prop doesn't reach the water or you have an extra 5" draught that wasn't there before!


As to the "steer clear of 2- stroke" - This is a good polariser on theis forum, but unless you are on a trailer, all I'll say having had the dubious pleasure of lugging 28Kgs worth of 1972 Johnson 20Hp down to the beach (with 2 of us to carry it) that every Kg (or lack therof) helps! It may "only" be X kg, but outboards are remarkably awkward things to pick up. and if it's a 4- stroke will also likely be fussy as to how you can carry / lay it down.
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Old 30 September 2013, 16:01   #3
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Owning a two stroke, and having played in a four stroke yesterday that was a 9.9hp I am all for the cleaning running 4 strokes.
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Old 30 September 2013, 17:41   #4
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Wow... Is my engine too big then? Got a 3.8m rib with a tohatsu 30hp 2 stroke on it...
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Old 30 September 2013, 17:58   #5
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I had a 3.5 m RIB with a 25 HP 2 ST Mariner. Very fast and fun to ride. Light and not so hungry on fuel.
I moved to a larger RIB (4.5 m RIB with a 40 HP 2 ST Mariner). Not so fast but still fun to ride. Heavier and hungrier.
Now I own a larger RIB (5.2 m RIB with a 90 HP 4 ST Suzuki). Faster than the previous ones and fun to ride but much heavier and needing less fuel.
Just a final comment: since I normally use the RIB in a lake, the usage of a 4 ST is almost a must.
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Old 30 September 2013, 18:19   #6
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Quote:
Originally Posted by Roadie View Post
I'm new to this forum and I am sure this has been asked before, but what do you all recommend. Currently I have an XPro 3.8m sib, with a 9.9hp mariner long shaft engine 4 stroke. Very nice engine but a long shaft, so looking at changing to a short shaft 15 or 20 hp next year, but should I steer away from 2 stroke and stick with 4.
The weight is the deciding factor for us SIBers.
I assemble and dissemble my SIB everytime and have used a 15hp 2 stroke and now have a 25hp 2 stroke. The 15 weighs about 36kgs and the 25 about 50.
If you're looking at getting a 15hp 4 stroke I think they weigh roughly the same as my 25!
So for no extra weight you get 10 more horses.
Long live the 2 smoke!
Obviously if your trailering then my input is irrelevant.
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Old 30 September 2013, 22:37   #7
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My 9.9 weighs 50 kg, so is just about manageable on my own as I too assemble each time.
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Old 01 October 2013, 00:19   #8
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New or used?

If you're in the market for a new engine, get a new ETEC 2- stroke. I love my ETEC 30: quiet, no smoke, no smell, powerful, clean, efficient, lovely. Very little maintenance too, and no break-in required.

If you're in the market for an older engine, then, unfortunately, the older 2-strokes don't come close to the new ETECs. I'd get an older 4-stroke if the weight was ok.
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Old 01 October 2013, 02:59   #9
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I understand that banning small 2strokes is stupid (they may be dirty but because of being small they are not so much as big ones); and small engines need to be as light as possible (personally I do not care about a 50hp engine being heavier since I will not move with my arms) so I think small 2 strokes should be allowed.

But when 2stroke vs. 4stroke evaluating, consider this:

1.- 2 strokes are banned in inner waters in most european countries.
Also in most european countries you will not be able to register a old 2stroke in a new boat (in Spain, since 2010). Thus you will not be able to get assurance, etc. So you will be ot of the law.
However boats older than 2010 can still use their old 2 stroke engines (but cannot replace them with other 2 strokes).

I do not know UK and USA laws but I believe they might be getting the same restrictions. Also, I do not now whether in UK and USA illegal boat owners are allowed because of relaxed law culture. Here in Spain, if you are lucky enough you may never get one, but...
boat bills have three zeros!

2.- 2 strokes are getting older since they are no longer manufactured. As a result of this and because of the demand, second hand 2 strokes are getting too much expensive.



On any other discussion such as maintenance, toughness, weight, etc. I think small 2 strokes are far better than small 4 strokes (yes, 4 stroke may be more fuel saving engines, but we are talking about small engines!).
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Old 01 October 2013, 03:27   #10
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Originally Posted by azzurro View Post
1.- 2 strokes are banned in inner waters in most european countries.
2.- 2 strokes are getting older since they are no longer manufactured.
Hmmm, not so sure about that
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