I have a 96 yamaha fzr 600 frame with a 97 yzf 600 engine. I had it out the shop for several months now and it has rode great. Today i started noticing some problems. I went to accelerate and i could feel and hear a knocking . It only happens when i accelerate over a certain rpm and happens in every gear. I (think) it could be my sprockets or chain or possibly both. I took off the clutch cover and noticed ALOT of metal flakes. Can anyone help?