2 stroke outboards

[stunnedmullet]

From somone who has just spent a number of weeks researching a boat/motor rig suitable for my requirements, my decision on which motor to purchase was based upon
* Reliability
* Simplicity
* Budget
* Match to boat(420 quintrex explorer)
* Honest evaluation of what I will need the motor to do.
Taking all this into account, I have chosen a Yamaha 30hp 2cylinder single carb model after looking at Suzuki, Tohastu, Johnson, and a range of second hand motors. Yes I know that a triple cylinder, triple carb will probably run better, yes I know a 4 stroke has a number of advantages(particularly running for long periods at low speed), but when it comes down to it I am(unfortuantely) only a once a month recreational fisher with a limited budget who has to stick to what I could say was honestly needed on my future fishing adventures.
Needless to say, I cannot wait until I am sitting in it and spending time with family and friends....and hopefully fish.

The mullet

[knakers]

I'm with the 4st brigade. I'm not 2 sure when people talk of higher servicing cost!!
How hard is it 2 drain oil out of a sump spin of a oil filter spin on a new 1 and top up with fresh oil. This only needs to be done every 100 hrs or i think 6 mnths which every comes first. Same with the gearbox oil. We get 200 hrs out of spark plugs no problems which can easily be changed. This work does not void ur warranty.
Water pump impellor replaced after 500 hrs or 12 mnths.
The talk of better fuel efficientcy really comes down to how the engine is driven, Just like your old Kingswood or your new Commodore, you sink the boot into the new commodore she will still suck down the go go juice.
I personally rather the 4st for smoothness, quiteness and the ease of servicing.
[smiley=2thumbsup.gif]

[SeaSaw]

Always an interesting debate. Having gone from a carby model 2 stroke to a 4 stroke, I would never go back, as the 4 banger has opened up new opportunities for fishing that I just wouldn’t pursue with the 2 stroke.

I am talking about getting into serious trolling. With the old 2 stroke, it just cost too much, and the engine did not like it, [smiley=thumbsdown.gif] so I never did more than an hour of trolling and really wasn’t very serious about it. With the new 4 stroke, I can troll all day, and I am starting to enjoy a new style of fishing that just was not an option previously. [smiley=2thumbsup.gif]

To illustrate the point, this is the comparison between the two engines. These are real figures based on moderate sea conditions (both engines return better figures in perfect conditions).

The 2-Stroke returned about 0.7km per litre at cruising speeds and used between 30-35litre per hour at trolling speed. ??? Incredibly bad when it comes to trolling.

The 4-Stroke returns about 1.1km per litre at cruising speeds and uses between 8-12 litres per hour at trolling speeds. [smiley=2thumbsup.gif]

So it I want to go out 50km to the wide grounds, troll for 5 hours and come home, with the 2-stroke that would have cost me 143litres for the 100km return trip and 175litres for 5 hours trolling, totalling 318 litres for the day. Given I have a 350 litre tank, I also start to run into range problems, but on cost alone this just wasn’t an option for me.

The same example with the 4-stroke costs 91litres for the 100km return trip and 60 litres for 5 hours trolling, totalling 151 litres for the day. [smiley=2thumbsup.gif] That’s the amount of fuel I used to use just get out and back to somewhere like the Barwon Banks to bottom bash with the old engine.

The 4 stroke is allowing me to do things that just were not viable with a two stroke both in terms of range and cost, so for me there is no comparison. To me this is more about fitness for purpose than one technology being better than the other.

Cheers,

Mark

[Mad_Barry]

To me this is more about fitness for purpose than one technology being better than the other.

exactly.

What size engine are you talking about in those comparisons ?

[cooky]

mark - that's a good little article. I can certainly see the value for you. particularly if taking the family. Most friends I know who go boating don't care about the fuel cost due to inviting other friends (pay for fuel between friends - doesn't work out to much each). If I was buying a boat your size I think I'd be looking at 4S for range / cost issues. YOu certainly have spent enough on a boat like yours to not want cash to keep exiting your wallet any faster.

[reScuE_RanGEr]

Knakers mate i have to disagree with you on the servicing. Coming from an organization that runs 5 large four bangers when we suggested to our dealer that we change our own oil etc like you mentioned we were told in no uncertain terms that warranty would be affected.

To get that simple service you mention done on a pair of V6's u are not gettin too much change out of $700.

Steve

[Black_Rat]

I have chosen a Yamaha 30hp 2cylinder single carb model

I owned a Yammie 30 CV for over two years and found it always to be reliable and a no fuss motor can't go wrong there [smiley=2thumbsup.gif]

[stunnedmullet]

Thanks for the feedback Black_Rat.
Horses for courses and a even though I think that ANY motor may well give you some grief at times the Yammy overall is a reliable and proven performer and as I am not into hours of trolling or running the motor daily for hours on end I am happy with my choice.
The mullet

[SeaSaw]

Dicko, The 2-stroke was a 200hp and the new 4-stroke is 225hp.

Mark

[Kerry]

"Fitness for purpose" is certainly a good bottom line as not everybody does the same thing but whatever it is they want to do then that will come at a cost, be it initial purchase cost or down stream maintenance cost or something ....

The word "service" is simply that but in due course when 4S's require pulling down for major works there will be absolutely no comparison to equiv 2S rebuilds, none what so ever, not even close.

For some of the bigger boats the higher end 4S's have a lot of logic when compared to the other options of either shafts or I/O. The amount of $$'s one guy here recently spent re-building just one of his diesels and legs would have brought 2 spanking new 4S's outboards and would have probably got a much better boat out of it all.

But the philosophy of selecting an outboard simply based on 4S or 2S simply doesn't hold water as 4S's might have some points but they don't have all the points, in many instances far from it.

Cheers, Kerry.

[Kerry]

"The EPA jury originally thought they would have to go to a four-stroke engine to achieve such important air quality benefits."

http://www.brp.com/en-CA/Media.Cente...07.04.2005.htm

Maybe 4S's really were just a stop gap measure ??? maybe the original prediction was close to the mark ??? bit of a shocker really

Cheers, Kerry.

[Big_Kev]

"The EPA jury originally thought they would have to go to a four-stroke engine to achieve such important air quality benefits."

http://www.brp.com/en-CA/Media.Cente...07.04.2005.htm

Maybe 4S's really were just a stop gap measure ??? maybe the original prediction was close to the mark ??? bit of a shocker really

Cheers, Kerry.

Good case of banging ones own drum I think.
What next evinrude invented the wheel.

[Kerry]

Good case of banging ones own drum I think.
What next evinrude invented the wheel.

The main stumbling with that one is those 3 miserable letters EPA have nothing to do with Evinrude but carry one hell of a PR marketing coup. Do you think any of the other manufacturers would have missed this opportunity if it had gone their way, but then it didn't, did it.

One must not loose sight of the "main" reason manufacturers went 4S when they did and that was to primarily meet some rather ridiculous pollution deadlines, sooner than latter.

Cheers, Kerry.

[Big_Kev]

Good case of banging ones own drum I think.
What next evinrude invented the wheel.

The main stumbling with that one is those 3 miserable letters EPA have nothing to do with Evinrude but carry one hell of a PR marketing coup. Do you think any of the other manufacturers would have missed this opportunity if it had gone their way, but then it didn't, did it.

One must not loose sight of the "main" reason manufacturers went 4S when they did and that was to primarily meet some rather ridiculous pollution deadlines, sooner than latter.

Cheers, Kerry.

Any and all manufacturers plaster awards in the face of the consumer to tell them how great they are.
I note this has been pulled from the bombadier web site?
Its called marketing. (sales people are very good at it)
I prefer to make my decisions based on fact not hype as you have always stated as well Kerry.

[Kerry]

Suppose could always pull it off the EPA

http://yosemite.epa.gov/opa/admpress...f!OpenDocument

Which ever way one looks at it, it doesn't change the fact that this doesn't sit well with opinions.

Cheers, Kerry.