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Stihl 261 muffler mod question

Discussion in 'Modded Hot Saws' started by Highdesignfool, Jan 1, 2018.

  1. Highdesignfool

    Highdesignfool Well-Known OPE Member

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    So I'm finally getting around to doing the muffler mod on my NON mtronic 261. I cut the gills in the left side of the muffler, took out the screen also. Is there any more that should be done?
    What's the consensus?[​IMG][​IMG]
     
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  2. Redfin

    Redfin Meh...

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    Open up under the screen holder.
     
  3. Highdesignfool

    Highdesignfool Well-Known OPE Member

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    Within the deflector or below? How much?
     
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  4. Redfin

    Redfin Meh...

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    As much as you can under the deflector.
     
  5. Redfin

    Redfin Meh...

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    Get rid of those limiters. 261 likes abit more fuel to run at its peak.
     
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  6. Highdesignfool

    Highdesignfool Well-Known OPE Member

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    Thumbs down
     
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  7. Highdesignfool

    Highdesignfool Well-Known OPE Member

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    I drilled out the pin that limits the travel on the H screw. That went great, just need to buy a tach
     
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  8. Chainsaw Jim

    Chainsaw Jim #fartedinthebandwagon

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    Under the deflector, not below. Some might even say "within the deflector".
     
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  9. Highdesignfool

    Highdesignfool Well-Known OPE Member

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    [​IMG]
    Does that look like enough?
     
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  10. Chainsaw Jim

    Chainsaw Jim #fartedinthebandwagon

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    Not if the channel feeding the screen wasn't cut open, removed or partially removed. A ball burr is about the best tool to use for this. You grind a hole through the channel where I have it marked. I don't like to grind it open too far forward because the deflector won't be able to direct the flow. 20180101_153658.jpg
     
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  11. Highdesignfool

    Highdesignfool Well-Known OPE Member

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    Are you saying the channel that the screen sits in needs to be removed?
     
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  12. Redfin

    Redfin Meh...

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    This is the way I have done a few 261s. I prefer to keep a screen in all my builds but it is replaced with one more open. IMG_3536.JPG IMG_3537.JPG IMG_3538.JPG IMG_3539.JPG
     
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  13. Redfin

    Redfin Meh...

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    Starter side outlet will get nutserts with 8/32 and a screen.
     
    Last edited: Jan 6, 2018
  14. Redfin

    Redfin Meh...

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  15. Joseph

    Joseph OPE Member

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    • Hello at all

    I would ask every body about return of expérience of muffler mod on ms 261 Electronic ( or not Electronic )

    The first modif have 6 or 7 years now

    So What about the gain of power after long time of use ?

    What about éventual fail or broken engine ?

    Or else news

    Thanks a lot for answer

    Jo
     
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  16. smokey7

    smokey7 Pinnacle OPE Member

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    Mods on a ms 261 ive only done 1 and it responded very well. It was a carbed saw and actually needed leaned out some after. Defiantly gained rpm and power. I just modded the stock outlet under the stock deflector. Actually extended the stock deflector some as it was coming out the side a little too miluch for my taste. Most saws i much prefer a single outlet over duel ports for performance and sound. I think duel ports have a crappy sound to them and i figure exhaust flows in a column of air and splitting up that air would probably not do it any good. Sorry for the ramble but that is my experience with them.
     
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  17. RI Chevy

    RI Chevy Stihl Runner

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    Interesting theory there. I never thought about exhaust like that in a singular path.
     
  18. Evan03

    Evan03 Well-Known OPE Member

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    I to like to build my mufflers with a single outlet. On 2 stroke machines
     

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