better choice 2 stroke or 4 stroke?

[Easy Rider]

mwatts,
I was using my 60hp Suzuki (w 4.8 quarts cap) as an example .. sorry. As for changing oil only once a season .. OK for .. not for me. Carbon collects in the oil of a gasoline engine as it's being run and is an excellent abrasive (much more so w a diesel) and the molecules get beat up badly so as to make them shorter thereby reducing their ability to keep metal away from metal. Corrosive elements form and "eat" metal. No thanks. After spending $6000 for my Suzuki I'm going to give it every chance I can. After break-in my E-tech is supposed to go to the dealer to get adjusted to 100-1. Mine will stay at 50-1. mwatts, I'm not on a bandwagon .. I think the 4 strokes over 29hp are wonderful . but I lead towards 2 strokes. And one can only criticize 4 strokes for their weight to a certian extent as they have largely been a replacement for IOs and I'm shure they are much heavier. . I do detest the little 4 stroke 1 cyl bangers.
Frosty,
They are alllll total loss systems. Two stroke just dumps it's oil more directly.
Easy Rider

[mwatts]

Originally Posted by Easy Rider

I do detest the little 4 stroke 1 cyl bangers.

Hehe.. No-one can disagree with that.

[powerabout]

re the 2 strokes, 2s oil does burn so there is not necessarliy oil coming out of the exhaust, at least its bio degradable and 4s I dont think is..is it?
You could always use the old castor ( bean ) oil, Castrol R1, makes a mess in your engine but it sure smells good

[Frosty]

Cripes,-- my 2 stroke bike that goes shopping every day drips black oil from the exhaust. It got blocked last weeks and I srcaped of thick incredibly black gunge from the removable centre baffle.

2 stroke oil burns!!!! ,--- some of it may do.

And yes it is auto injection. I top up the tank once a year. I use about 1 liter per year.

Stand behind one with white trousers on,!!!

[ondarvr]

I raced, modified and tuned bikes for decades, if there's black stuff dripping from the pipe its either because you don't ride it hard enough, its jetted too rich, the oil injector isn't adjusted correctly, or a combination of these. A clogged baffle is a typical issue on a bike that's not ridden hard enough. You getting old? lol.

[powerabout]

True enough Frosty
Imagine being in a East German traffic jam with a queue of Trabants!

[Frosty]

Its a city bike and its ridden whilst stood still most of the time, if you know what I mean.

Mine is no different than every one elses, except that my old Suzi Crystal can not be replaced, you can not buy 2 strokes any more from new.

But it does have an emission test every year for road tax.

[sandhammaren05]

Why would it be wiser? Evinrude E-Tecs are more powerful and cleaner than 4 strokes.

Originally Posted by mwatts

Actually, I owned a 1991 Johnson 50HP 2S for quite some time. It is still running (a close friend owns it now) and it's a fast and powerful engine; pulls 2 wakeboarders or a mono skier with 3 people in the boat without any problem. And it ran on virtualy anything, as long as it was more than 60 octane. It not being so "delicate" can be a welcome thing in some area's.

But 4 strokes have come a long way since then, as far as power / weight ratio is concerned.

If I would have to choose now, I would choose a 4S, simply because I don't sail at WOT ever anymore. If you never open the throttle further than 2/3 anyway, 4S is a smarter choice.

[jonr]

One you are up to speed, 50HP is 50HP and a 2 stroke or a 4 stroke will be equally fast (except for the slight weight difference).

[sandhammaren05]

It's not just top speed, it's how long it takes to reach top speed. And, a 50 hp 4 stroke won't run with a pre-2000 2 stroke, won't turn the RPM. The E-Tecs would turn up if you could deprogram the rev-limiter. Someone did and won in Paris recently. Intake-burn-exhaust-intake-burn-exhaust - .... !

Originally Posted by jonr

One you are up to speed, 50HP is 50HP and a 2 stroke or a 4 stroke will be equally fast (except for the slight weight difference).

[SunnySkies]

Something to be said for hitting the key and quiet running with no smoke. I would say it depends more on the application. Given the size of the boat I would bet this is a non planing hull. Merc Bigfoots or similar engines are better suited because of thier gear ratios. There isn't a lot of difference between modern DI two strokes and four strokes anymore. IMHO

[sandhammaren05]

Originally Posted by SunnySkies

Something to be said for hitting the key and quiet running with no smoke. I would say it depends more on the application. Given the size of the boat I would bet this is a non planing hull. Merc Bigfoots or similar engines are better suited because of thier gear ratios. There isn't a lot of difference between modern DI two strokes and four strokes anymore. IMHO

Sounds boring, I love the fine odor of 2 stroke exhaust. I'm writing about high speed planning hulls, relatively little wetted surface. Whether on our 330 lb nutshell with our 1981 7.5 hp (16 mph) or 1981 15 hp (26 mph), on our 350 lb high speed V-bottom (1983 35 hp, 42 mph), or with 250-300 hp, the 2 stroke is faster with far greater acceleration. My brother in law has a Honda 50 on a displacement boat. Ho-hum. Also, the idea of a small outboard is portability. With our 7.5 (35 lb) and 15 (75 lb) on the Baltic island, we transport the motor lying on its side in a hand cart to and from the storage shed to the boat. With the 35 (110 lb), I can throw it in the trunk of the car. Can you do that with your 4 strokes? How much do the equivalent motors weigh, and does oil run out when laid on the side? Ever see the video of the Evinrude 250 pulling the Yamaha 250 backward and under water?!

[Easy Rider]

Now thats outboarding Sandham. My old 2 stroke Johnson or newer 2 stroke Yamaha hardly ever smoke at all and I've never seen any smoke from my Evinrude E-tech. I saw a twin cyl 4 stroke the other day w the head off and I could see that the pistons rise and fall together. All the old british motorcycles (4 stroke) did that. The reciprocating mechanical mass is as a one cyl engine! No wonder they shake when you get em reved up a bit.
Sunny Skies, I bought the 2 stroke E-Tech after the 4 stroke Suzuki mostly to get simplicity. That Suzuki is a wonderful engine but very complicated.

Easy Rider

[sandhammaren05]

Originally Posted by Easy Rider

Now thats outboarding Sandham. My old 2 stroke Johnson or newer 2 stroke Yamaha hardly ever smoke at all and I've never seen any smoke from my Evinrude E-tech. I saw a twin cyl 4 stroke the other day w the head off and I could see that the pistons rise and fall together. All the old british motorcycles (4 stroke) did that. The reciprocating mechanical mass is as a one cyl engine! No wonder they shake when you get em reved up a bit.
Sunny Skies, I bought the 2 stroke E-Tech after the 4 stroke Suzuki mostly to get simplicity. That Suzuki is a wonderful engine but very complicated.

Easy Rider

I don't mind 4 stroke in car and lawnmower but wished I'd had a 2 stroke Yamaha motorcycle back in 1981. For me, outboarding without 2 stroke isn't outboarding. Actually, the E-Tec is at the limit. It's 2 stroke, but with fuel and oil injection is otherwise very much like a 4 stroke. Except that oil doesn't run out in the trunk if you lay it on its side ... . The E-Tec is so clean that is't allowed on Bodensee in Germany. The new Evinrudes arrived at a friend's dealership in Houston last Aug. with the EU (European Union) environmental approval stamp on the downhousing.
I hate the propaganda that tries to outlaw 2 stroke motors (and I usually vote left/green).

[Wynand N]

I have an 85 hp Suzuki 2 stroke (mid 80's model) on the tail of my fishing boat and the only time I saw a bit smoke, is with start ups. As soon as she idles, no smoke - even accelerating hard or running like the wind there is not a puff of smoke to be seen...Although it is an auto lube, I also add 1:100 ratio 2s oil in fuel tanks just in case.
Funny thought, no "usual" two stroke smell coming from my motor either - the other day riding with my friend on his ride, the Yamaha of same hp fitted smelled like a real two stroke motor

Would I change for a 4 stroke? No