i just recently bought a 99Zr 700. It seems to be a good sled except for one problem. There seems to be an awful grinding noise coming from somewhere??? It usually does it when it hooks up a bit or if you hit the brakes. I had the chaincase open but i didn't see anything wrong, its not slipping on the cogs, i've verified that. how tight chould the chain be? Any ideas on what it could be. It seemed to run good for a couple miles, then it just started to make this noise worse and worse. Any input would be appreciated. The chain is 36 links long and 13 plates wide.....