Author Topic: Exhaust finish  (Read 1118 times)

gmac

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Exhaust finish
« on: June 20, 2017, 04:31:37 AM »
Just helped my son get my (now his) '83 out of storage and the exhaust is corroded. Black and Gold, Black exhaust.

My question is does anyone know what the finish is on the Black exhaust, obviously not paint, looks more like a plating, and on one side on the back it looks like there may be Chrome under the black finish?

Wondering what I can do to make her look good again as my son wants to get her looking good to ride (as I may have stated in my previous post). Anyone have any ideas on a new finish?

As always any suggestions appreciated.

Thanks.

Gary

Walt_M.

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Re: Exhaust finish
« Reply #1 on: June 20, 2017, 06:33:54 AM »
That is black chrome. It can be redone but likely expensive. Is the old exhaust actually sound enough to be worth the trouble? Mine rotted out years ago.
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gmac

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Re: Exhaust finish
« Reply #2 on: June 20, 2017, 08:25:37 AM »
The exhaust and mufflers are like new (I bought the bike new in '85) except for the finish. We had her running in 2011 and looked good, not sure why it corroded since then but now there are rust spots on the outside.

QBS

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Re: Exhaust finish
« Reply #3 on: June 20, 2017, 01:19:08 PM »
Are the rust spots obviously surface rust or do they appear to be deeper rust bubbles?  If surface, phosphoric acid remeves rust.  Not sure of its effects on black chrome.  If the rust appears to be bubbling from underneath: I put a couple of JB Weld patches on such areas of my 83's muffler many years ago.  The factory mufflers are still quite serviceable.

I think the secret to muffler longevity is: Every-time the engine is started, even if you only need/want to run it for just a minute, it must be run until the full length of the exhaust system is heated to fully hot, to the point that even the very tips of the mufflers are almost too hot to touch.  This ensures that no combustion gas acid condensate remains in the system to rot it internally.

To prevent surface rust in the future: When you know the bike will be unattended for three weeks or more, Spray WD 40 on the mufflers surface pretty heavily and spread it evenly on the surface.  When the time comes to next start the engine, be sure to clean the WD40 off the surface very well because it may damage the chrome surface when heated.  Just give it a real good heavy wipe down with a clean dry soft cloth.
« Last Edit: June 20, 2017, 01:32:26 PM by QBS »

artbone

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Re: Exhaust finish
« Reply #4 on: August 05, 2017, 11:12:47 AM »
Since I"m in the throes of a cosmetic rebuild on my 83 I've got the same problem as gmac. I wonder if powder coating would hold up? I found out last week that I've got a powder coating guy about a mile and a half from me and I"m itching to try him out.
Art Bone

'83 Yamaha Vision in the Classic Black and Gold  Running
'82 Yamaha Vision Running
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QBS

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Re: Exhaust finish
« Reply #5 on: August 05, 2017, 12:34:18 PM »
Art, sounds like a good fix if the pc will tolerate being reheated to exhaust system heat levels.  Please be sure to give us a report of how it turns out.  Your coating guy may have a pretty good idea of feasibility.  Cheers to you.

Prophet Of Doom

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Re: Exhaust finish
« Reply #6 on: August 05, 2017, 06:09:53 PM »
Powder coat is available in high temp varieties, but they aren't good for exhausts which get really hot.


A better choice would be Cerakote.  Available in chrome, black and some other colours.  Black is the best for heat stability up to 1100C.   






fret not

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Re: Exhaust finish
« Reply #7 on: August 05, 2017, 11:36:06 PM »
We used to sand blast chrome pipes and spray them with Bar-B-Que Black or some other high heat tolerant paint.  If you check with 'performance shops' you can find many colors of exhaust paint.  For sure it won't look exactly like original but if you do a good job it should make a clean appearance.  The original surface needs to either be blasted or chemically etched so the new paint can get a grip.

I have seen white pipes, and red, and a stunning bright blue.  These colors come in 'flat' rather than glossy.  Black always looks good.
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fiat-doctor

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Re: Exhaust finish
« Reply #8 on: August 06, 2017, 10:53:21 AM »
+1 for both Fret Not and POD.  I have used both methods on car headers (extractors) :) and the ceramic coating looks very hi-tech, is very durable, and also very much reduces underhood temperatures.  Not too expensive, think it was about $100 USD for a 4 cylinder set.

Painting requires the prep mentioned...  I had them blasted with lots of other stuff so the cost was minimal.
Also looks pretty good, not quite as durable (but you can touch them up yourself) but provides no underhood temperature reduction. 

Steve

artbone

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Re: Exhaust finish
« Reply #9 on: August 09, 2017, 11:29:12 PM »
A lot of old classic sports cars had ceramic coated exhaust manifolds but I've never seen anyone use this on motorcycles. I think it requires much higher heat than powder coat but it really looks great.

On my bike I was thinking of just having the mufflers powder coated. I'm pretty sure the header pipes wouldn't hold up but maybe the mufflers don't get that hot. We'll see.
Art Bone

'83 Yamaha Vision in the Classic Black and Gold  Running
'82 Yamaha Vision Running
'74 Norton Fastback - Colorado Norton Works #26  Running
'73 Norton Interstate  Running
'75 Triumph T 160  Running
'62 Harley Davidson Vintage Racer
'61 Sears Puch  Running
'15 Triumph Scrambler
'17 Honda Africa Twin
94 Kawasaki KLR 650

fret not

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Re: Exhaust finish
« Reply #10 on: August 10, 2017, 12:08:31 AM »
Art, mufflers can get hot enough to melt the soles of boots.  It becomes difficult to clean off after it cools.
Retired, on the downhill slide. . . . . . . . still feels like going uphill!

Rikugun

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Re: Exhaust finish
« Reply #11 on: August 10, 2017, 07:07:31 AM »
I'm pretty sure the header pipes wouldn't hold up but maybe the mufflers don't get that hot. We'll see.
I have no experience with powder coating or it's heat limitations. Having said that, I wonder if the double wall construction of the (stock) header pipes wouldn't help preserve the finish through heat reduction?
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Kenny

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Re: Exhaust finish
« Reply #12 on: December 06, 2017, 09:40:21 PM »
  I'm going with Rikugun on this one as the pipes are double walled - I have had very good luck with header paint & I have never seen a Vision with blued Pipes. Now my 84 BMW is a different story.
     Cheers Ken S.
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