Vintage and Classic Hondas

Making an custom muffler

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lcochran

Making an custom muffler

So i have a 75CB750F with the stock 4into1 on it and im interested in getting a little more growel out of it. I've ran it briefly with the muffler off and its just a tad obnoxious. So in my attic i found an original 4into1 muffler can thats pretty dinged up and ive decided to cut it up and make a custom muffler.

Anyone have any experience cutting these mufflers? How are the baffles organized in there? Where would be the best place to cut. any information would be beneficial.

Daddyman

Re: Making an custom muffler

Be prepared to re-jet when you change the muffler.

---1976 CB750F CAFE---
Florence, Colorado

TOOLS1

Re: Making an custom muffler

Administrator

In reply to this post by lcochran

Just drill some 3/8 inch holes in the end until it sounds like, you want it to.
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

lcochran

Re: Making an custom muffler

Daddyman, did you rejet yours after you went with the 4 into one w/o a muffler?

Drill 3/8th inch holes into what?

TOOLS1

Re: Making an custom muffler

Administrator

Just drill the holes in the end. There should should be a smaller hole in the center of the muffler at the end. Drill holes around it.
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Daddyman

Re: Making an custom muffler

In reply to this post by lcochran

Ya I did re jet, it ran like crap without the muffler at first. Waited to re jet until I got my pod filters, runs sweet now

---1976 CB750F CAFE---
Florence, Colorado