Hi everyone , just an update. i got the bike back from the shop. They said they had checked everything and made sure all is fine. The leaking in the headcam , they told me it's just old stains , i checked it after riding it for hours and yes seems like there is no leaks and it does indeed look like a stain. The front brakes/rotor (i think) was changed and the chains and sprockets were changed too.
Almost everything seems fine accept today regarding the rev(got the bike back on Thursday)... i had the problem to rev the rpm to go over 7k-8k. on the day i got the bike back after all the repairs , i tried to rev to bike and it went easily to the red zone. Today a kawasaki zx10 raced with me(i was actually just testing out the bike to see if there were any other issues with the bike when i overtook him at 150km, which was why he started to race with me ) and i wasn't able to go above 220km. I had a hard time catching up with the kawasaki and only was able to reach 230km.
I started to doubt why i wasn't even able to get near the kawasaki zx10 . Even my previous k6 1000 could touch 230km more easily than my busa... so i went to a lone road and tried to rev the bike and i wasn't able to rev it over 8k. i stared to smoke and tried again after 15 mins and it was able to rev over the red zone. so i'm confused now. how come earlier it was not able to rev over 8k and after letting the bike cool down.. it was able to rev to the red zone?