Hey guys I have a couple of questions. First off i have a 2000 WR 400, and it has a lot of miles on her, my brother had it before me and used it on the track a couple of times, and i am just a trail and hill climber freak. But anyway i don't have the money to go out and buy a new bike but this is my question, i have a weird noise coming from the left side of the motor, i talked to one of my friends and he says that it could be my cam coming loose? is that possible, or i should say common. It is like a clinging noise like metal parts vibrating together. I mean i don't really beat my bike but i do use all the power she will give me. So i am not sure what i should do, should i bore it out and rebuild the motor or should i just try and pay someone to look at the bike and give me their two cents on what might be wrong with it. I have kept up on all maintence, but just am not sure what i should do next. Thanks for the help.