4-stroke forums very NEGATIVE!!!

alswagg said:
I have always been a Yamaha fan, due to fit and finish and durability. I work on all sled manufactures sleds. Yamaha being the most reliable next I would say is Polaris, then Ski doo and last Arctic Cat. I really like the looks of the 2 stroke sleds. I have not really warmed up to the 4 stroke machines. Beside being very difficult to work on, I see alot of items which are very expensive to fix once a small impact happens. I seem to ride older but mechanically very sound machines, Maybe I am just getting older and cheap.
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^^^^ Same here.
 
I have had problems with both my 06 and 07 attacks but minor. I think most people post complaints on here for solutions and /or to make others aware of the problem and fix. I have ridden twice this year and both times both sleds overheated even though the temps were down near zero. I knew this could be a problem when there isn't much snow dust on frozen or icy trails but, didn't want to spend the money on rear heat exchangers. Well, I finally got pissed and talked my dealer into giving me a deal on 2 heat exchangers.
So maybe Yamaha does have some problems but, I love my Attacks! They are the perfect sled for me riding wide UP groomed trails. Just add a 13mm sway bar, add aftermarket 3.5 idler wheels, set it up correctly, and add a rear heat exchangers... 11 grand later I have the perfect sled for me!
 
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Well Im not sold on the 4 strokes. I think that its hard to meet the power to wait ratio of the 2 strokes. Now the milliage is getting even better with the 2 strokes than the 4. Its getting much harder to justify the 4. The new E-tech from ski doo is a perfect example of power and fuel economy. I dont think that I would like to get a new yammi cause they are all 4. I dont think yamaha should limit themselfs to just 4, they should give us the decision on what we want. Im not saying im not a yammi guy, I just like there older sleds. They made some pretty bad *** 2 strokes like the 700cc in the viper. They were all reliable as well. Its to bad.
 
what does the e-tec do with the oil, it burns it right. i cannot believe that sometime in our future the goverment will raise the bar again and again and again. to the point that any emissions from burnt oil will not be allowed. this is where the 4 stokes really shine sure by that time the 4 strokes we will be burning a little oil but the but as long as they leave the factory clean it's all good.
 
blue missile said:
what does the e-tec do with the oil, it burns it right. i cannot believe that sometime in our future the goverment will raise the bar again and again and again. to the point that any emissions from burnt oil will not be allowed. this is where the 4 stokes really shine sure by that time the 4 strokes we will be burning a little oil but the but as long as they leave the factory clean it's all good.
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i think the unburned oil is what the issue was on 2-strokes, port timing with normal induction causes some of the charge to be expelled on the compression stroke. the etec doesnt rely on port timing but injects the charge once the ports are closed.
 
The government cant get rid of burning oil. Who ever heard of a 4 stroke weed eater. There are too many uses for 2 strokes other then snowmobiles. The 2 strokes now a days are far better then they ever used to be and they will keep getting better. Again they have the upper edge. With more devolopment in 2 strokes like the Etech the 4 strokes cant keep up.
 
Lone Wolf said:
The government cant get rid of burning oil. Who ever heard of a 4 stroke weed eater. There are too many uses for 2 strokes other then snowmobiles. The 2 strokes now a days are far better then they ever used to be and they will keep getting better. Again they have the upper edge. With more devolopment in 2 strokes like the Etech the 4 strokes cant keep up.
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There are lots of 4 stroke weed eaters. :o|
 
2 strokes will get to a point and then they will no longer be able to improve, they burn oil for lubrication if they dont they dont run long. and by the way a few years back who would have thought the goverment would have as strict of emissions on motors that they do now. were getting cat converters on push mowers. if you think big brother cant up the stakes you are sadly mistaken as long as our earth is suffering and believe me i'm no enviromentalist glaciers melting species dieing will go to extreme measure to try to stop this.

just my 2c worth
blue
 
the new administration was backed by people who want to see all oil and gas burning anything reduced, and or stoped from being used at all. Epa regs wont get easier in the next 4 years.
things that will save 2 strokes is by making them so complicated that they wont be cost effective for use in most sleds.
boysean has designed a sliding door style exhaust port two stroke, that will help to keep the power band way wider and fuel loss way down, if you loose less fuel out the exhaust, you loose less oil. It also allows you to use standard style exhaust with no expansion chamber.
 
Saw that one. It is something how Supertrax - being on the cutting edge of mechanical technology - has managed to notice something- " -2 stroke engine equipped with a lever not unlike those used to power a steam engine." -that is right out of the 1700's. How long will it take them to figure out that the internal combustion engine (something really new) - including the one in the picture - also uses a mechanism that is like the Boyesen valve system. It is the crankshaft and connecting rod.
 
Doo's SDIs and Etecs do not use oil/gas to lubricate and cool the crank bearings. The cases are more complicated because they run coolant closer to the crank bearings than anyone else. The bearings themselves are very special sealed bearings. One of the reasons the SDI 1000 is no longer manufactured is the additional stress the big pistons put on the crank bearings tore them up. They never did figure out a fix for this. An SDI engine is a very sophisticated engine and although there are safeguards built into it when it shells it is a huge expense. The Etec is even more complicated. I give 'Doo a big thumbs up for attempting all this but there is no way I would own an SDI or an Etec if it were not on warranty. The second owners of these sleds will be the real guinea pigs.
 
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