Inside the new MS261C II

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Well well, they are avaible in all dealer networks in Norway at least with prices, included MS 261 C-M VM.
Old model is removed on Stihl Norway homepage also.
Perhaps I should take a drive and see if they are in shops also, that said, maybe, I dont stress to see an Stihl :p.
Checked prices, 1050$ for 261CM VM, 900$ for 550XPG, like said earlier, Stihl have some serious work to do with their pricing ;)
 
Well well, they are avaible in all dealer networks in Norway at least with prices, included MS 261 C-M VM.
Old model is removed on Stihl Norway homepage also.
Perhaps I should take a drive and see if they are in shops also, that said, maybe, I dont stress to see an Stihl :p.
Checked prices, 1050$ for 261CM VM, 900$ for 550XPG, like said earlier, Stihl have some serious work to do with their pricing ;)

Still no news of the MS261-II here, but as far as pricing goes... the old, non heated 261CMQ is €950. Exactly the same list price as the non-heated 550XP. And both Stihl and Husqvarna will go hungry before having the same price flexibility as Echo. :D
One funny thing is noticed is here Husqvarna and Stihl seem to price their products exactly the same. Stihl raises the price by 10€? Husqvarna will follow in under a week and the other way around.

This is weird behavior as Stihl outsells Husqvarna by four or five to one here. If you come to my area that's probably six or seven to one, if you count Jonsered's as Husqvarna. One would expect Husqvarna to act more aggressively to gain market shares, but their only aggressive policy is towards those attempting to buy a spare part. :laugh:
 
Still no news of the MS261-II here, but as far as pricing goes... the old, non heated 261CMQ is €950. Exactly the same list price as the non-heated 550XP. And both Stihl and Husqvarna will go hungry before having the same price flexibility as Echo. :D
One funny thing is noticed is here Husqvarna and Stihl seem to price their products exactly the same. Stihl raises the price by 10€? Husqvarna will follow in under a week and the other way around.

This is weird behavior as Stihl outsells Husqvarna by four or five to one here. If you come to my area that's probably six or seven to one, if you count Jonsered's as Husqvarna. One would expect Husqvarna to act more aggressively to gain market shares, but their only aggressive policy is towards those attempting to buy a spare part. :laugh:
the only reason I can think about in Norway is currency, 550XPG is old while 261 mkII is new.
Since 550xpg and 2253wh came on the marked here they have not jacked the prices up much, 30-40$ on 3 years is kinda little. We just buy XPG/WH because the little price difference, I think it's a big mistake by Stihl Norway to price the VM version as they do. Both Husky and Jonsered have solid dealer network in Norway, at least where I live, actually far better then Stihl.
 
I had my dealer call Bryan Equipment again today and they at least admitted to knowing about the new 261 this time. Unfortunately, we probably won't see them until late spring. Sure wish I could get someone to pull some strings and get me one!
There is a YouTube video from Stihl with the new saw, but I don't know how to link it on here with my phone.
 
Hi,
here more pictures, especially from the intake as you wanted Brad ;)

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anyone knows this small hole? Was it previously there in the old cylinder? I can't remember.....


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Interesting - that small hole appears to be fed from the strato air intake, and is positioned to open before the fuel/air intake. So it will provide a shot of straight air into the case?

I'm assuming the piston drops low enough to close that hole at BDC?

It will also close last as the piston comes down, so maybe it is to shoot some fuel/oil into the strato flow?
 
I don't think it'll matter too much after I make it look like this ;)

IMG_5531-L.jpg
LOL, I know your gutted stratos go like stink, but one of these days I'd like to have a (friendly) discussion about why you mix fuel into the strato path - although that's probably material for a separate thread. I can't see any advantage to it, as there's never any problem getting enough fuel into the combustion chamber while leaving the strato function intact. I've even modified one by increasing the strato duration while leaving the fuel air intake alone, and it will still 4-stroke.

Meanwhile, I'm still curious what they were up to here....
 
LOL, I know your gutted stratos go like stink, but one of these days I'd like to have a (friendly) discussion about why you mix fuel into the strato path - although that's probably material for a separate thread. I can't see any advantage to it, as there's never any problem getting enough fuel into the combustion chamber while leaving the strato function intact. I've even modified one by increasing the strato duration while leaving the fuel air intake alone, and it will still 4-stroke.

Meanwhile, I'm still curious what they were up to here....
There's only one reason. Nothing else I did made the saw run like I wanted. Gutting the strato makes a huge difference, both in the 261 and the 241. If you go back to my original 261 thread, where I was modding perhaps the first 261 sold in the US, I did progressive mods. I just wasn't seeing the gains I wanted. I finally threw caution to the wind, and the result is gutted strato. It works! That's all I can tell you. They run good with out the gutting, but not all that impressive.
 
There's only one reason. Nothing else I did made the saw run like I wanted. Gutting the strato makes a huge difference, both in the 261 and the 241. If you go back to my original 261 thread, where I was modding perhaps the first 261 sold in the US, I did progressive mods. I just wasn't seeing the gains I wanted. I finally threw caution to the wind, and the result is gutted strato. It works! That's all I can tell you. They run good with out the gutting, but not all that impressive.
Well it's hard to argue with what works - I'm just always interested in why! My guess is that it has more to do with increasing intake flow on those particular saws than it does with introducing fuel into the strato ports.
 
The size of the ports at the cylinder wall are no larger.
Right. And because these are Mtronic saws, the fuel mixture isn't any richer, although it may have to add more fuel in order to make up for increased volumetric efficiency and/or increased scavenging losses. In other words, you can't force it to have a richer fuel ratio. But if removing the divider increased air flow simply by creating a less restrictive intake, then the pumping efficiency would be improved, and if you trapped more air in the cylinder you'd get more power (fuel would be adjusted appropriately).

But it has to be all about the air, not the fuel - you can always get enough fuel up there, and if adding fuel to the strato runners made it richer MT would adjust it back out. These strato saws have lots of intake area and can be made to breathe really well - I suspect that if you could open the intake like you have but leave the thinest of dividers separating the strato and fuel air intakes it would run just as well.

On a non MT/AT strato saw I found I could increase the strato duration without increasing the fuel/air intake duration, which improved the air flow and performance but might have also increased the delay until the fuel/air got to the cylinder. I was worried that at high enough rpm the fuel arrival would be so delayed that the transfers would close before it all got there and the mixture would lean out. But that did not happen and I could still make it too rich with the H screw. I'm guessing it may just have drawn that extra air down into the case, so that it did not increase the delay.
 
Well actually if I understood it correctly, brad is just turning a strato saw into a convetional two stroke engine by remouving the divider. Would be interesting to see how much the fuel consumption increases by this measure. The strato saving is essentially lost.

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Well actually if I understood it correctly, brad is just turning a strato saw into a convetional two stroke engine by remouving the divider. Would be interesting to see how much the fuel consumption increases by this measure. The strato saving is essentially lost.
Yes, but the goal is to improve the performance, and it achieves that. It's probably not possible to open it up that much and preserve the strato function. It still has nice quad transfers.
 

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