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Author Topic: Carbon on exhaust ports.  (Read 792 times)

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Offline Rgconner

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Carbon on exhaust ports.
« on: July 28, 2011, 12:04:19 PM »
I took off two of the headers and could see quite a bit of carbon buildup on the exhaust ports. I carefully brushed it out using a stiff plastic brush and put it all back together.

What is the typical cause of this? Running rich?

The bike was not well tended before I got it, so now that I have most of the mechanical issues sorted out, what was the likely cause of the problem? Will it just burn off or do I need to get more aggressive about cleaning it out?

Could it be caused by oil getting past the rings? I don't see any evidence of oil burning after about 300 miles since the last change, so I am fairly certain they don't leak much if at all.
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1975 CB550K aka "Grease Monkey"

KingCustomCycles.com

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Re: Carbon on exhaust ports.
« Reply #1 on: July 28, 2011, 12:16:42 PM »
Gunked up exhaust ports is usually oil getting burnt and depositing itself on the port walls and inside the header.  When looking to buy a SOHC sitting on someones garage floor, Clean ports = good rings, dirty ports = high mileage or low compression.  Running rich forms soot and mild carbon but nothing like oil coking. 
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Offline WarwickE36

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Re: Carbon on exhaust ports.
« Reply #2 on: July 28, 2011, 12:35:36 PM »
Quote
oil coking

But how do we market this oil coke to the inner cities?
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" Why does anyone get offended by what someone does to their own bike? I dont get it. "

You made me think about it after I cheered knowing someone else would like to know what these control freaks are up to.
 Every time any owner strips whatever precious Honda part the horrified purists parts go up in value. That's not the part that bothers them.
 What bothers them is they sat up late at night, their breast full of wonder and estrogen, unable to sleep, dreaming about their lovely darling and all her glory... and next thing you know someone else doesn't share their emotional deluge and their reaction is they must spread their mind museum as far as they possibly can, taking over as much of the real world as possible.

Drink fast, drive slow, but ride it like you stole it

1974 Cb550 with style
2004 SV650s

KingCustomCycles.com

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Re: Carbon on exhaust ports.
« Reply #3 on: July 28, 2011, 12:43:36 PM »
black tar coke, now that is scraping the barrel for a buzz.
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