Hey guys I went out on my first ride on my new yz125 yesterday and everything went fine on that but I started to notice an odd sound from my BROTHERS yz85, its almost like a low pitched spinning sound from the bottom end. Our friends who we were with drained the oil on the side of the track and it was a very light grey color. Where do I start with this? Only place I can think of would be the gasket between the cylinder and the case, and could the bottom end be bad? I think I'll go ahead and pull the cylinder off and inspect the gasket but I wouldn't think the coolant would make any different sound.