SOHC.co.uk Forums > Project Board
I bought this CB550K3 at Auction
kevski:
K3's had stays, including my 500k3
K2-K6:
"I grant you that the wire wool has done a good job with the rust, but how durable is the result? Will it come out in a rash of rust spots after being out in the rain?"
Good question. It's one of those things that generally is not looked at very closely. The chrome doesn't rust, chromium being the significant element making steel "stainless" when alloyed with steel.
The visible rust is the steel structure material corrosion coming out through pores in the chrome plate. In effect not curable, but rub it off and keep just a little oil on it, and it'll stay reasonably good but difficult with hot exhaust.
As I understand it, really good protective chrome would use nickel and copper "undercoat" with decorative chrome to finish, effectively making impermeable barrier to the base steel rusting.
Think all chrome of this era ultimately needs coating with oil to preserve it as it's more decorative than long term protection.
gbjeppm:
--- Quote from: K2-K6 on October 15, 2020, 06:57:51 PM ---"I grant you that the wire wool has done a good job with the rust, but how durable is the result? Will it come out in a rash of rust spots after being out in the rain?"
Good question. It's one of those things that generally is not looked at very closely. The chrome doesn't rust, chromium being the significant element making steel "stainless" when alloyed with steel.
The visible rust is the steel structure material corrosion coming out through pores in the chrome plate. In effect not curable, but rub it off and keep just a little oil on it, and it'll stay reasonably good but difficult with hot exhaust.
As I understand it, really good protective chrome would use nickel and copper "undercoat" with decorative chrome to finish, effectively making impermeable barrier to the base steel rusting.
Think all chrome of this era ultimately needs coating with oil to preserve it as it's more decorative than long term protection.
--- End quote ---
I have no doubt that the exhausts are rusting from the inside out, and in fact the no 3 pipe has a couple of holes on the underside of the silencer about 10 cm after the join to the header. I think i am going to get a stainless patch tig welded in to it to make it solid, but i am a little concerned how thin the steel inside is now.
I am just hopeful that getting them clean and keeping them clean and dry, and oil coating, and stored inside will prolong its life.
Oh and it needs to be used...... that will help a lot
Johnny4428:
Mine has never had a front stay.
gbjeppm:
--- Quote from: Johnny4428 on October 15, 2020, 09:17:19 PM ---Mine has never had a front stay.
--- End quote ---
Interesting on the stay. I keep looking at the pictures, and i think that my bike with the mudguard/fender with the stay extends further over the top of the tire, although I can't be sure.
When i take it off I will look for a part number, it may be after market.
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