I just purchased a 2000 WR400 recently. I am a newbee to motorcycles but a gear head in general. I have noticed what I would consider an excessive amount of oil coming from the crankcase blowby tube. I know if this where my jeep, I would have to consider rebuilding the top end. I have tried to search for this problem on this board, but have come up pretty short. Is this something that I should worry about. The compression is real tight, runs great, not burning any oil and starts on the first kick without the choke even after sitting for a week. I have noticed that the original owner did very little maintenance on the bike if any at all. The air filter fell apart when I took it out, the oil filter looked like the original one (covered in metal shavings from top to bottom). Please let me know if I should tear this thing down or just not worry about it at all. I am sure the bike has at least a couple thousand miles on it. Help! TIA!