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Author Topic: New exhaustpipe, which one?  (Read 3100 times)

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Offline lassenc

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New exhaustpipe, which one?
« on: March 01, 2006, 03:43:07 AM »
My original exhaust is getting in a pretty bad shape :(

Found a flake of rusty metal in one of them today.

Is it possible to get some aftermarket ones that look like the originals?

I'm interested in any kind of exhaust!

I have a CB500K 1978, so I don't really know if I should buy an exhaust labeled for the CB500 or the CB550K
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Offline bill440cars

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Re: New exhaustpipe, which one?
« Reply #1 on: March 01, 2006, 04:33:10 AM »
As far as I know, the 500K and the 550K will swap out. The 550F( being a 4into1)  bolts up
     different but, should be able to be adapted. If I don't have my thoughts straight, somebody kick in
     and let me know. I'm not an authority but, I believe I'm right in my thinking. I do know from, what
     seen on here, that a 650 shouldn't fit. Hope I have helped some, at least. Later on, Bill :)
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Offline lassenc

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Re: New exhaustpipe, which one?
« Reply #2 on: March 01, 2006, 04:41:13 AM »
Where can I get exhausts for it?

I've only found a MAC at ebay, which I don't like, the exhaust I mean.
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Offline TwoTired

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Re: New exhaustpipe, which one?
« Reply #3 on: March 01, 2006, 11:22:49 AM »
Any exhaust system for a CB500/550 will connect up to the exhaust ports with equal aplomb. (replace the crush gaskets).
Aftermarket types will need bracketry to fit between the different mount points of the frame and muffler, whose locations vary with the model.

The centerstand up stop is located on your current mufflers.  If you don't want centerstand to chain contact, a bump stop will have to be fabricated for that purpose.

The CB500/550 K3 model has an exhaust system unique for that model.  It's flow and restriction characteristics are also unique.  And, the carburetors are jetted to perform properly with those characteristics.  If you change the mufflers to another type, be aware that the carburetor jetting/tuning will no longer match Honda book settings.  If the muffler manufacturer doesn't specify the new carburetor settings, it is up to you or your mechanic to discover what the new correct settings are for you new mufflers.  Each carburetor has at least three and likely four adjustments to make for mixture control, corresponding to idle, part open, midrange, a wide open throttle settings.

Almost all aftermarket suppliers tout lower exhaust restriction than the stock mufflers, leading you to believe your engine will make more power.  It can, particularly at wide open throttle in the RPMs near red line.  A street bike spends little time at those RPMs.  Very, very few explain carburetion setting changes necessary to restore street performance at normal driving speeds.

If your current mufflers have holes and are leaking exhaust gasses, the restriction characteristics are already changed from stock.  This may explain the flat spots or engine hesitation to throttle changes you have recently been complaining about.  Expect more and more pronounced behavior of this type with replacement mufflers.

I have brazed patches over holes in stock muffler systems.  Wasn't pretty, but, it worked.  I did notice some of the engine performance issues went away.  And, the carburetor adjustments worked best when restored to Honda book values.

Best of luck!


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Lloyd... (SOHC4 #11 Original Mail List)
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Offline lassenc

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Re: New exhaustpipe, which one?
« Reply #4 on: March 01, 2006, 12:32:01 PM »
Great post TwoTired!

Though I knew most of it from other tuningprojects I've had :)

I just need some models besides the MAC one.
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Offline lassenc

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Re: New exhaustpipe, which one?
« Reply #5 on: March 06, 2006, 02:19:48 AM »
http://www.predatormotorsport.co.uk/hermes/shop/item?itemId=FH38

Guess that one have no chance of going on my K3?
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eldar

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Re: New exhaustpipe, which one?
« Reply #6 on: March 06, 2006, 08:28:18 AM »
Is your WHOLE pipe shot or just the muffler? If it is just the muffler, you can always check out some slip-ons. These are available from a number of different sources and not all are mac. You can get different styles too. It is something to think about if nothing else.

besides, once you start patching, the end is near. Besides, if you have to patch the outside, think how bad the inside is. A new muffler will be better anyways. You lose that baffling inside and the your tuning changes anyways.
« Last Edit: March 06, 2006, 08:30:11 AM by eldar, Master of the K8 Thunder! »
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Offline lassenc

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Re: New exhaustpipe, which one?
« Reply #7 on: March 06, 2006, 08:45:31 AM »
Well, I found metal flakes of rust in the pipe, and pipe nr. 2 has a leak at the header/muffler welding.

So yeah, I guess it's pretty bad shape on the inside :(

I've got no problems with the others yet, besides the chrome getting a bit pitted.

http://www.cyclexchange.net/index%20pics/July%20crisscross%201.JPG

This is the one I like the most, think that'll be the one I go for, if it fits, that is, it just says that it is for the CB550  :)

http://www.cyclexchange.net/Exhaust%20System%20Page.htm

This is the page, there are also some "Turn outs" but will they fit if I cut my pipes?

I'm not familiar with the tube size on the header, that's why I ask :)
« Last Edit: March 06, 2006, 08:47:13 AM by lassenc »
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eldar

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Re: New exhaustpipe, which one?
« Reply #8 on: March 06, 2006, 11:52:57 AM »
Measure the O.D. of you pipe. most slip-ons come with reducers if you need them Or you can custom fab an exhaust peice then weld it. Sure you have a weld make BUT if can be polished and shine fairly well so it is not as noticeable.
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Offline lassenc

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Re: New exhaustpipe, which one?
« Reply #9 on: March 06, 2006, 11:57:33 AM »
Quote from: eldar, Master of the K8 Thunder! on March 06, 2006, 11:52:57 AM
Measure the O.D. of you pipe. most slip-ons come with reducers if you need them Or you can custom fab an exhaust peice then weld it. Sure you have a weld make BUT if can be polished and shine fairly well so it is not as noticeable.

You've got a point, and I can do that!

But that Jardine cross over exhaust has really gotten to me, 30 years old, and has never been mounted.

Making new brackets will not be a problem at all, could there be other problems than that?
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Offline TwoTired

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Re: New exhaustpipe, which one?
« Reply #10 on: March 06, 2006, 01:08:54 PM »
Quote from: lassenc on March 06, 2006, 11:57:33 AM
But that Jardine cross over exhaust has really gotten to me, 30 years old, and has never been mounted.

Making new brackets will not be a problem at all, could there be other problems than that?

Yes, clearance for the foot brake arm.
I had a 4 into 2 on my 74 Cb550 for years.  These used the stock head pipes and the muffler on each side sliped over those.  I had to heat and bend the brake lever arm to clear the new arrangement.
The jardine crossover looks like you will lose some ground clearance.  And, if you get to keep your centerstand, expect to modifiy it.
 I also wonder if it clears the side stand.  Looks wide.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

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Offline lassenc

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Re: New exhaustpipe, which one?
« Reply #11 on: March 06, 2006, 01:15:36 PM »
I'll send them a mail then :)
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Offline lassenc

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Re: New exhaustpipe, which one?
« Reply #12 on: April 04, 2006, 01:00:12 AM »
Quote from: eldar, Master of the K8 Thunder! on March 06, 2006, 08:28:18 AM
Is your WHOLE pipe shot or just the muffler? If it is just the muffler, you can always check out some slip-ons. These are available from a number of different sources and not all are mac. You can get different styles too. It is something to think about if nothing else.

besides, once you start patching, the end is near. Besides, if you have to patch the outside, think how bad the inside is. A new muffler will be better anyways. You lose that baffling inside and the your tuning changes anyways.

Any links by the way, on slip-ons I mean...
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

eldar

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Re: New exhaustpipe, which one?
« Reply #13 on: April 05, 2006, 07:40:12 AM »
You can find slip-ons from a number of sources. even jcwhitney has loads of them. do a google on motorcycle slip-ons.
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Offline lassenc

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Re: New exhaustpipe, which one?
« Reply #14 on: April 05, 2006, 07:56:18 AM »
Which size are the outer diameter of the headers?

Yes, I am too lazy to run down from third floor to check right now :)
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

eldar

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Re: New exhaustpipe, which one?
« Reply #15 on: April 05, 2006, 08:21:30 AM »
cant quite remember but it is something like 1 3/8 inch OD. Cant remember for sure anymore.
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Offline lassenc

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Re: New exhaustpipe, which one?
« Reply #16 on: April 11, 2006, 12:13:24 AM »
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It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

eldar

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Re: New exhaustpipe, which one?
« Reply #17 on: April 11, 2006, 09:19:50 AM »
hard to say since it is for a 550.  would bet  the diameter would be the same or close enough.
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Offline lassenc

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Re: New exhaustpipe, which one?
« Reply #18 on: April 12, 2006, 06:47:44 AM »
Quote from: eldar, Master of the K8 Thunder! on April 11, 2006, 09:19:50 AM
hard to say since it is for a 550.  would bet  the diameter would be the same or close enough.

Arent the K3 pipes the same?

I have a Cb500k3, remember...
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

eldar

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Re: New exhaustpipe, which one?
« Reply #19 on: April 12, 2006, 07:52:12 AM »
check with steve or two tired. they will know that part.
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Offline SteveD CB500F

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Re: New exhaustpipe, which one?
« Reply #20 on: April 12, 2006, 08:04:30 AM »
Quote from: lassenc on April 12, 2006, 06:47:44 AM

Arent the K3 pipes the same?


Technically yes, but the hangers are different.
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eldar

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Re: New exhaustpipe, which one?
« Reply #21 on: April 12, 2006, 08:29:34 AM »
You could fab some hanger though unless you are talking about the ports?
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Offline SteveD CB500F

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Re: New exhaustpipe, which one?
« Reply #22 on: April 12, 2006, 08:34:10 AM »
Any 500 exhaust will fit up to the 550 head.

The hangers on the frame are different.
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