I am hopeful some (maybe alot) here could educate me about valve chatter. I seem to hear what I think is valve chatter between 2500 RPM's and 3000 RPM's. It is kind of annoying, as sometimes I get lazy and let the motor get down in that range rather than downshifting. Perhaps it may not be valve chatter? Any other thoughts? It really only occurs when the clutch is engaged.