Just R&R'd the forks on my Ninja 250 to flush them out and fill with fresh oil. Bike has 15K on it and is a 2007 -- first time I've touched the forks on it. God almighty that shit smelled terrible! Hard to believe that oil in a relatively sealed environment can get so disgusting! I don't get where the sulphur/sewage smell comes from -- I noticed this on my VFR a couple of years back working on those forks. Is it something in fork oil that "goes bad?" Yellow metals in the bushings?