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Author Topic: CB550F Mac muffler  (Read 1264 times)

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Offline HawaiiMike

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CB550F Mac muffler
« on: September 20, 2010, 02:48:35 AM »
I did my first long ride yesterday on my reassembled '76 CB550F.  It now has the stock 4 into 1 headpipes along with a MAC muffler.  I was surprised at how much I liked the sound of the MAC.  Not too loud, yet a throaty sound, better than stock.
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Offline eideteker

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Re: CB550F Mac muffler
« Reply #1 on: September 20, 2010, 05:16:33 AM »
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"Spit on the tip of your finger, lube the inside of the hole, and then wiggle it around and twist a bit back and forth as you apply pressure." - mystic_1

1973 CB500K - not bad for a first bike
2009 SFV650 - torquey, reliable 90° V-twin

Offline HawaiiMike

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Re: CB550F Mac muffler
« Reply #2 on: September 20, 2010, 06:10:53 PM »
You still won't hear how it sounds, here's now it looks.
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Offline jessezm

  • '77 cb400f cafe build
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Re: CB550F Mac muffler
« Reply #3 on: September 20, 2010, 06:16:54 PM »
I've got that same muffler on my CB400f, but I took out the baffle and replaced it with a kerker 2" baffle and I am IN LOVE with the way at sounds!
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Offline Stev-o

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Re: CB550F Mac muffler
« Reply #4 on: September 20, 2010, 06:27:52 PM »
That looks good but this thread is worthless without audio! [kidding].

My 550F came with a differant Mac muff than you have, I didn't like it and found a stock muff.
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline sandbarsurfer

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Re: CB550F Mac muffler
« Reply #5 on: September 20, 2010, 09:47:12 PM »
Hey I have the same bike and was wanting to try a Mac muffler. Did you have to do any carb work or did it work well just on it's own?
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Offline HawaiiMike

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Re: CB550F Mac muffler
« Reply #6 on: September 20, 2010, 11:56:10 PM »
The jetting is pretty close to stock.  When I took the motor apart, cylinders 2 + 3 showed some signs of overheating.  I changed the main jets on those two cyls to 100 (98 is stock).

The needles are on the stock settings, 4th notch from the top.  The air screws are currently at 1 turn out.   

Oh yeah, I am running a UNI stock replacement air filter.

So yes basically the MAC muffler doesn't require much (if anything) in the way of rejetting.

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