So I read a lot of the threads on this topic and am very confused. This is normal? I have not heard the sound when someone else is riding my bike, but this def does not sound like its tuned and sounds like its falling apart. Someone described this noise as "tin can is rattling" and this gets louder and louder and more rachety as the revs go higher up. If i put load on the motor and start slowing down its very very noticable. This just started and i could swear it wasnt like that before. Is this the way the motor will sound from now on? Does this get better? Im not sure why this sounds like this. My acura integra with headers had this sound and my 07 RX8 had this sound when reved to 9k. Seems like this is normal on more then just bikes...i personaly think it sounds like garbage though...anyone else been able to figure out if this is a problem or somthing that i will have to deal with? i am afraid to ride the bike normally because I cant tell if its breaking or going to break..