Wow....reminds me of the time a kid called my shop (1979 or there about) and said "My XR70 engine is making a noise...listen"....(and he holds the phone near the bike...I hear a lot of sounds...who knows what).
He comes back on the phone and says "what do you think?"....I said..."Kid, you need to get that bike down here as soon as possible. Stop riding now before it blows up!"
That is kind of where I have to go on this, your first, post.
There is just not a lot of info there to go on. Take the bike to a knowledgeable mechanic and let him look at it. No way we can give any other advice on this forum from what you have told us.....sorry Fouad (I have a foster brother with that name!).
I used to be fast....now I just dream about it.
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'08 910R (Gina), '04 F4 SPR #275 Track Bike (Lola), YSR50 (The Rabbit) restoration project, '71 CB100 "Lil' Red", '73 RD350B (Orange Bird) restoration project, '08 TT-R110 (Buster) Pam's ride, '05 TT-R230 (Dirty Girl), 2015 Indian Chietain (Rita) my "low-n-slow".