R1200RS + R1250RS Forum
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Mon Aug 31, 2020 8:53 pm
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my 2020 (March) 1250rs exhaust headers goes brown in spots near the headers if i don't ride for a week or so causing 30 mins per side laid on the floor with Solvol Autosol. |
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No, I won't put up with it, it looks shabby. |
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Zitat von wessie im Beitrag #3 This. If there’s pitting, it’s rust (why you should clean your bike). If it’s discoloration, it’s normal. Chrome does not handle high temperatures. I suppose it looks nicer and holds up better than trying to ceramic coat pipes to protect them. The onlypolishing I did on my XX was to get rid of the patina of the exhaust tips (burnt hydrocarbons). It does bother my OCD need for cleanliness, but I’ve learned to live with it.
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Chrome doesn't handle heat...its stainless isn't it? |
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Its not discoloration, its definitely brown spots and it develops when it sits in the garage after a ride. |
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Its not discoloration, its definitely brown spots and it develops when it sits in the garage after a ride. |
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Zitat von Adrian Nurney im Beitrag #6 Some of the bikes have chrome plated stainless and some have plain stainless.
Lee
2016 R1200RS Iowa, USA |
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Zitat von Adrian Nurney im Beitrag #6 Zitat von Lee im Beitrag #10Zitat von Adrian Nurney im Beitrag #6 I’m not up to speed on my chemistry, but stainless and chrome may have limits on what they can withstand and still look “showroom new.” I don’t think I’ve ever seen chrome exhausts looking spotless from end to end after a few thousand miles of use. Normally the discoloring is isolated to the headers...which makes sense considering the intense heat at that part of the exhaust system.
I’m a Notary Public. RESPECT MY AUTHORITY!
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The stainless on my r90s has been on 20yrs, that still comes up like chrome, though I do know it will wear out eventually! |
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Adrian, if it is stainless steel (and not chrome) it will never wear out. The corrosion resistance comes from a chromium oxide layer that forms on the surface of stainless steel, it is thin (few nanometres) but is “self healing”. As soon as you polish it away to remove discolouration you also reveal more chromium to the surface (that is evenly spread through the steel) and it immediately oxidises to form a new protective surface layer. Very clever stuff. A chromium plating on carbon steel does the same job and even better (more shiny) as its solid chromium and forms an even better surface oxide, however it will wear out eventually from polishing and then the rust starts to show through as the carbon steel substrate gets exposed. |
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It's my experience that chrome turns different shades of blue to yellowish. Stainless turns brownish and can be polished back close to original. Haven't seen many products that will remove the blue.
2017 R1200RS- 34,000 mi. 3 yrs.
2003 R1100S Boxer Cup Replika #6/200 1985 K100/1100RS- 326,000 mi. 35 yrs. 2016 R1200RS- 28,322 mi. 18 mo. (gone) 2011 R1200RT- 30,000 mi. 2 yr. (gone) 2005 R1200ST- 58,000 mi. 8 yr. 3rd deer killed it. 1999 R1100S- 15,000 mi. 2 yr. (gone) 1996 Ducati 900SS/SP- 89,000 mi. 12 yr. (gone) 500,000+ BMW miles |
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I am still amazed that the black paint on my daughter's 1981 R65LS still looks OK. Both the header pipes and mufflers still look black, they have not rusted and have not faded. They sure don't make paint like that anymore.
Current motorcycle collection: 2002 Yamaha FZ1; 2020 KTM 390 Duke; 2011 Royal Enfield Bullet 500; 2009 BMW F650GS; 2016 BMW R1200RS; 2018 Zero S 16.6 kWh
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