Serowbot wrote on 09/07/09 at 08:45:50:It's normal, look at car mufflers.... ten feet back fron the engine and super hot... just normal...
But car mufflers aren't baffled, motorcycle mufflers are.
Quote:It doesn't mean you're lean,... pipes can blue from running rich too... it just means you've been running bad or running hard...
Mine blued after I had the petcock problem,...
As noted, it's not just the pipes (which is pretty normal, from everything I've seen and heard), but the muffler as well. It's pretty seriously blued. I had suspected it was running a bit lean, and the bluing built up over time, but that might not be the case.
I was planning on changing the plug anyway, so it's just another thing on the list of tune up/blank slate repairs to do with the new (old) bike.