i dont know if this is my transmission but whenever im in 5th and 6th gear just simply cruising around 6000rpm i get a grinding sound. sounds like its coming from my front and rear sprockets and chain. i was talkin to a guy one on one and he was suggesting it might be a transmission and he said it could simply be just putting tans fluid in my bike. any opinions the fluid seems to be the cheapest thing to start with. help please. i ride everyday and need it for work

 

trans fluid? I hope you dont mean ATF.. your CBR has a wet clutch.. that means that the same oil that is in your engine goes through your clutch....

 

so maybe im just low on oil or do you think this problem is a little more severe my bike has 20920 miles on it

 

How old are the chain & sprockets?

 

not sure when i bought the bike a year ago it had them on it. the bike was beat up and i put work into it but ive still yet to do that. i was planning on doing it in a couple of weeks or so but this noise is scaring me while riding. i also ride it pretty hard typically around 8 grand on my travels to and from work(30 miles one way)

 

My chain was shot when I bought my F4 (although I put another 7k miles on it before I replaced it ) and soon realized I had quite a bit of chain noise and sometimes a grinding sound. It was especially apparent riding in a tunnel near my house in which you are close to the side wall. It even game me a scary loud clunk once. The reason why it was so loud was because the chain/rear wheel alignment was (completely) off. This was also apparent in the rear brake pads because they were tapered!

Check your alignment.