Okay, I haven't been riding long, but my bike has a bit of a rattle comming from the motor. Now I've been told that bikes tend to rattle a bit (this is at idle when hot or cold) Now, I'm not sure if this is normal. I can't really feel any problems with the bike, but hey, what do I know. The bike has done 26k, 91 zxr250. I have heard that timing chains need to be changed, but I wouldn't have thought so early in it's life. I know it's a grey import though and that I can't really trust the kms on the clock. So that being said, not sure what I should do.