Well here is the deal. A while back I read about someone cutting a 261 muffler in half, remove the guts, open up the port and then welds it back together. I have contacted a few members and I cannot for the life of me remember who it is.
Who does the fancy STIHL MS261 MM ??????
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chadihman
Addicted to ArboristSite
Well here is the deal. A while back I read about someone cutting a 261 muffler in half, remove the guts, open up the port and then welds it back together. I have contacted a few members and I cannot for the life of me remember who it is.
I posted about a 361 that was all choked up. I cut the muffler in half gutted the cat looking crap and welded it back together with a nice pipe.
Take a small toch like you would use to solder copper pipes and with the muffler mounted in a vise heat the leading edge that is folded over to glowing and use a screw driver you aren't afraid to mess up and peel-roll the edge back all the way around. Open the muffler and completely gut it. and then double the size of the opening or at least to the max amount that allows you to still keep the spark screen in place. Reheat edges and close ti back up and retune.
They sound great after this is done and run even better.
They sound great after this is done and run even better.
Pics?
Ouch! Thanks man, I will definitely investigate.
woodcutter82
ArboristSite Member
There isn't anything in the muffler to take out, as far as a baffle and you would be wasting your time. Just make the whole there now bigger and remove the screen.
There is an inner baffle as I recall that does restrict flow as I recall. After I did mine it completely changed the way it ran and sounded for the better. Wish now I had taken pictures:msp_sad:
It was worth while to split the muffler completely open.
woodcutter82
ArboristSite Member
There is no baffle in the muffler. I just mm mine, the only thing in the muffler is the little portion in the top right that the screen slides into and the two tubes that keep the muffler from being crushed that the bolts slide into. It pretty much is just a hollow can, same as my MS441RC-M. I MM it today as well.
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Mine was a little different then wish I would have taking pic's
It had a channel on the upper left side of it about 2 inches long with a opening that lead to the factory outlet
I just took a air cut off tool to it and cut the opening about 1 inche in size so the factory opening is about 3 x the size plus another opening on the other side of the muffler
It had a channel on the upper left side of it about 2 inches long with a opening that lead to the factory outlet
I just took a air cut off tool to it and cut the opening about 1 inche in size so the factory opening is about 3 x the size plus another opening on the other side of the muffler
Here is the thread that Stumpy did about the MS 261 that shows the channel
http://www.arboristsite.com/chainsaw/213343.htm
http://www.arboristsite.com/chainsaw/213343.htm
If adding an additional port to the side, there's nothing to be gained by splitting the muffler. Also, remember that this is a stainless steel muffler, and not near as easy to work with.
jughead500
Sasquatch
Sometimes that little crimp along the edges can turn into a pain.got to watch some are electronically welded and not crimped.fell into ruining a muffler for my fs250 stihl.i know better now cut the top and cut the center out and reweld somewhere besides the seam.
:msp_thumbsup:
:msp_thumbsup:
Mastermind
Work Saw Specialist
The easy way to do a 261 muffler is by cutting a slot under the factory opening.....yet still inside the deflector. That's how we do the 441, 362, and 261....
