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Author Topic: fitting a muffler to my 4-1 (giant pipe?)  (Read 980 times)

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Offline 1974blaze

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fitting a muffler to my 4-1 (giant pipe?)
« on: June 07, 2011, 08:53:56 AM »
i have a 4-1 on my 75 cb750k.  the ID is something like 2 1/4 in, huge right? but i've seen other pics of open headers that look similar.  so do i just need to bend a pipe that's big enough on one end to fit over the header and 1 3/4 on the other for the muffler? i'd like to fit a emgo shorthy reverse cone, which by the way i used to see for $35 and now seem to be $60. 
thanks for the help.
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Offline Bankerdanny

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Re: fitting a muffler to my 4-1 (giant pipe?)
« Reply #1 on: June 07, 2011, 09:08:23 AM »
I'm sitting at my desk and nowhere near my bike, but looking at a ruler, 2 1/4 doesn't strike me a large for a 4-1 setup.
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Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline 1974blaze

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Re: fitting a muffler to my 4-1 (giant pipe?)
« Reply #2 on: June 07, 2011, 09:29:00 AM »
yeah i agree, looks like everyone else's. but universal mufflers are all like 1 1/2 , 1 3/4 right? i know it seeks like like i'm asking an obvious question, but what am i missing?
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Offline domer

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Re: fitting a muffler to my 4-1 (giant pipe?)
« Reply #3 on: June 07, 2011, 02:18:44 PM »
the kerker on my 500 is 2" but thats the older model (70's?) every other kerker ive seen is 2.5". i know what you are saying about finding a muffler... check with the guys at cyclex, they make there own reverse cone, and i think they can bang it out in a size close enough that a small reducer or enlarger would work to fit it...
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Offline Mayor08

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Re: fitting a muffler to my 4-1 (giant pipe?)
« Reply #4 on: June 07, 2011, 07:14:52 PM »
a few sellers are offering the type of shorty muffler you want in 2 1/4" I bought one from Lossa Engineering but if you don't like $60.....
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Offline 1974blaze

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Re: fitting a muffler to my 4-1 (giant pipe?)
« Reply #5 on: June 07, 2011, 09:50:26 PM »
yeah, that  lossa stuff is slick for sure.  i'll check around.
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