Late 1980's Moto-4 350 making scraping noise
 

My Moto-4 350 is making a scraping noise. It kind of sounds like on a car, when the disc brake pads get low. It sounds like a fairly thin piece of metal scraping / vibrating. It makes the noise when not moving and when moving. Any ideas what it could be? I've worked on my car a lot but not really on atv's.

It isn't a grinding noise, just sounds like a heat shield or something rubbing something that is moving.

Thanks