Knock

[sprtrx300ex]

My 300 knocks at an idle and also I notice it when i give it full throttle when racing. My valves are adjusted and it still does it. I also run 93 gas. Is it the cam chain? Any ideas?

[4TraxRider]

Does it have good oil in it? It could be something simple like something rattling on the engine or something. It could be the vavles, but you said you checked them. Only other thing i can really think of is detonation from low octane gas, but if your using 93 i really don't have any ideas.