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Author Topic: Stihl 391 muffler mod  (Read 716 times)

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Offline Parmstrong191

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Stihl 391 muffler mod
« on: February 01, 2020, 10:37:11 AM »
I just did a muffler mod on my 391, carb tuned in and all. Currently running 25" bar with full skip chain, wondering if i could bump it up to 28" or possibly even 30"-32". 28" sounds more reasonable to me but looking for other(s) opinions!
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Offline sawguy21

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Re: Stihl 391 muffler mod
« Reply #1 on: February 01, 2020, 11:20:39 AM »
Welcome! 28" probably the practical limit, even with the muffler mod the 391 won't produce enough power to comfortably handle more than that.
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