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#Post#: 41524--------------------------------------------------
7900 Muffler
DIR By: KilliansRedLeo
Date: June 18, 2014, 11:07 am
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Anyone know if later black top 7900s have a cat muffler?
#Post#: 41526--------------------------------------------------
Re: 7900 Muffler
DIR By: 660magnum
Date: June 18, 2014, 11:35 am
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I bought a 6421 that was a 2010 model and it had a cat muffler.
It came from the factory set rather rich as did my 2010 5105
that also had a cat muffler which I changed to a 5100 muffler.
I have a 2006 7900 and it had a regular muffler.
I immediately converted the 6421 to a OEM 7900 and put a regular
muffler on it. Both my 7900's have the HD filter that I
installed.
I stihl have these saws.
#Post#: 41530--------------------------------------------------
Re: 7900 Muffler
DIR By: NathanielVansickle
Date: June 18, 2014, 12:06 pm
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7900-7910 don't have cat muffler. 7910 has SLR. 6400 has the cat
#Post#: 41564--------------------------------------------------
Re: 7900 Muffler
DIR By: KilliansRedLeo
Date: June 19, 2014, 6:35 am
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Thanks 660 and Nate. I was wondering since the mufflers seem
quite heavy compared to a Husqvarna or Stihl.
#Post#: 41572--------------------------------------------------
Re: 7900 Muffler
DIR By: NathanielVansickle
Date: June 19, 2014, 9:27 am
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If it is a 7900 muffler don't spend to much time on a mm. It
doesn't seem to help much. Enlarge the opening and that's it. I
keep the spark screen in place. 7910 with the SLR crap and 6400
with cat muffler respond to gutting the mufflers or just
swapping to the 7900 muffler.
#Post#: 41574--------------------------------------------------
Re: 7900 Muffler
DIR By: KilliansRedLeo
Date: June 19, 2014, 10:06 am
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Thanks Nate, did you get the package I sent?
#Post#: 41575--------------------------------------------------
Re: 7900 Muffler
DIR By: 660magnum
Date: June 19, 2014, 10:21 am
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Keep in mind that there is a difference in the mounting of the
catalytic and regular muffler.
The difference that effect us is that the top bolt is a
different length and so is the spacer that goes along with the
bolt.
So if you order a muffler you need to get the correct bolt and
spacer also.
#Post#: 41576--------------------------------------------------
Re: 7900 Muffler
DIR By: KilliansRedLeo
Date: June 19, 2014, 10:31 am
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Thanks, Jim!
#Post#: 41577--------------------------------------------------
Re: 7900 Muffler
DIR By: NathanielVansickle
Date: June 19, 2014, 10:44 am
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--- Quote from: KilliansRedLeo link ---
>
> Thanks Nate, did you get the package I sent?
>
--- End Quote ---
yes I did. thank you!!!!
#Post#: 41578--------------------------------------------------
Re: 7900 Muffler
DIR By: KilliansRedLeo
Date: June 19, 2014, 10:48 am
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Found out that Hyway makes a replacement for the old 'windowed'
7900 piston. Ordered one and it came in today. Looks pretty
nice, I will get pictures of it up a little later in the day.
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