I did not observe any residue on the clutch pulley but I will make sure to take a close look next time I open the Trans, and also to clean everything thoroughly.
What would you say as the recommended solution for cleaning ( Gasoline, Brake Cleaner)?
By looking for the cause of the sound yesterday I found that one exhaust pipe is missing the screw nut on the engine head.
There are 4 screws on 2 pipes but only 3 34mm nuts.
Head where the nut is missing has also completely changed color.
Since I could not find a similar nut to replace I went to a guy that makes things like that from metal ( don't know english word for it) and ordered a new one to be made by sample.
Looking online I see that incorrect O2 readings can impact performance and create lean running conditions ( which would explain my gut feeling of running lean ).
I just ordered a replacement belt from china, it should be a direct replacement to Mitsuboshi i have on there now ,
the belt item number is not visible so I am not even sure if that's the right belt , I got it with the bike.
Thank you,