I'm new to the sight- it's awesome.
Just bought a 99 klx300 on Monday. Now I have noticed that it makes a heckuva lot of racket when it gets to a particular low to mid rpm. This is only after it has warmed up. It's so loud and distracting that I first thought it was a vibrating heat shield, but I'm 99% sure the noise is coming from the top of the cylinder head. The bike has about 3000 miles on it and was well maintained, including a valve adjustment before I got it.
Oddly enough, I only noticed the noise just after changing the oil this morning(kawachem 20w50). At first I left the tricky little oil-filter spring out and the bike smoked like a chimney. I'm not sure if this is related to the noise, but hey? Other than that noise, the bike starts and runs like a champ.
Any thoughts or suggestions??