My cousin's YZ 250f shot what looks like a gear fragment through the case right below the water pump. Lost about 1/2 the oil out on the trail, some while I towed him back, and the rest in the bed of the truck. I have some questions: He said he noticed a faint, low volume screeching sound coming from the engine right before he shut it off (stopped to wait for other riders). It WAS NOT leaking oil at the previous stop which was about 3 miles before. 1. I'm guessing the sound was because it was low on oil right? 2. Other than that sound the bike was running fine. Should he be worried about catostrophic engine damage? I doubt it 3. What do the outer cases (not the middle case halves) usually run? 4. Now would probably be a good time to go through the clutch and waterpump? I'll see if I can get him to post pics of the damage. The hole is no bigger than the end of a pencil. Thanks.