i currently have a 90hp 2 stroke yamaha on a 22f/c G3 pontoon. i am wanting to upgrade my motor for more Hp and better economy.I have a choice between a 115 4 stroke yamaha and a 2 stroke injected 115 nissan both 2010 models. any suggestions.
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If the Nissan is direct injected and works like the Optimax or Etec models it is a good candidate for on this boat. The direct inject 2 stroke is lighter, just as economical, and will get the same power to the water as quickly or quicker than the 4s. The weight difference is what would have me leaning toward the 2 stroke. If the warranty is similar and the dealer has a good reputation and is near by I would not hesitate to put the Nissan on my boat.
If I were shopping fo a new powerplant for my boat I would buy the max HP in an Optimax or Etec. If the Nissan is a comparable motor to them I wouldn't shy away from it.
If by injected on the Nissan you mean oil injection to mix fuel and oil to run through an old fashioned carbeuretor, then I would say the 4 stroke is what you want. You don't want to mess with a carbuereted 2 stroke motor in this day and age.
I have a Mercury 115 four stroke on my 20' Crest. It is a Yamaha motor that was made in Japan. I gotta tell ya, I love it. I will NEVER own another two stroke. It's quiet, doesn't smoke, doesn't put oil from combustion in the water, no fooling with adding oil to the oil tank, no worrying about whether the oil injection is going to get clogged and stop injecting oil while we're under way, etc. I love this motor. This is my fourth boat and first four stroke and I am sold on it.
When I got the boat it was propped all wrong, and with some help here on iBoats I got the right prop and it is an absolute joy to own. I was the first on the river here to have a big four stroke on a pontoon, now I see them all time. I know that the Etec is a good motor, but after owning this four stroke, I don't see myself ever having another two stroke.
My advice, get that Yamaha. Get it now. You will love it.
I have a Mercury 115 four stroke It is a Yamaha motor I will NEVER own another two stroke. It's quiet, doesn't smoke, doesn't put oil from combustion in the water, no fooling with adding oil to the oil tank, no worrying about whether the oil injection is going to get clogged and stop injecting oil while we're under way, etc. I love this motor.
Taken slightly out of context... but what Soul Said....
But you still need to change oil and filter and dispose of it so those engines are not as environmentally clean as one thinks. At wide open throttle the noise levels of modern two strokes are within a very small margin of the four strokes. All you need to do is check performance reports. A two stroke makes a different sound than a four stroke so most folks equate that to quietness which it is definitely not. No -- I'm not biased. I have both technologies. The four stroke is much more service intensive. Valve adjustments, oil and filter changes, etc. Doesn't make them bad motors, but it does not make them any better or worse than DFI two strokes. And a DFI two stroke will almost always out holeshot an identically equipped boat with a four stroke motor of the same HP. I happen to prefer a four stroke on my pontoon since it is not required to run at high rpm nearly as much as my V-hull. On it I prefer the hustle of a two stroke.
Im no where near the experience level of others on this post, but I will say that the 115 2 Stroke Evinrude Etec that I got for my 22ft has been great. Now having said that, I have no experience to compare it to other than a small 14ft Starcraft with a 40HP Johnson that I used for 3 years.
But I must say that I talked with two mechanics and several boat owners who said the 2 stroke has less parts and therefore less to go wrong with it.
And I always heard that the Evinrude was "bullet proof." As folks on here may remember, I was struggling between the Mercury Optimax and the Evinrude. I even bumped up the HP after talking with a couple of people.
And I had a "Made in America" requirement as well. Im sure some engine componets were shipped in from overseas though.
I could use some advice on prop and whether Im "propped correctly." I need to do some measurments and report back, however I assume (remember the first three letters of the word though) its a standard prop for the engine (although I was told its aluminum, which is better than steel).
And also, one of the posters on here refered to the oil injection resevior (sp). What should I watch for on this issue.
which motor for pontoon
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