I'm looking an buying a used YZ450F and I have a few concerns. The bike looks great but a lot of the cosmetics have been replaced, clutch cover repainted, boot/frame area covered up, new graphics kit. The price is good, for Canada anyway. What I am worried about is he said the bike has less than 20 hours and he had replaced the water pump seal because it was leaking out of the weep whole. A post on here mentions a problem some YZs had with this that concerns me because a bike with this little use should not be in need of a water pump seal should it? You can see the bike here http://ontario.kijiji.ca/c-ViewAd?AdId=286498112&MessageId=MSG.VIEW_AD.REPLY_TO_AD_SENT&mpname=R2S&mpname=Activity-R2S&mpuid=1700219%3B307%3B286498112%3B49639785%3B%3B&secev=AQAAATA7oAIAAM0AAAACACExMzA0MmZjZjBlYS5hMjBiMjc0LjZhMGYuZmZmZTRmMzkAAAAAEROdQAEAAAACAAAAARgkTwBjWBbcKmOucqWtIaHEP%2FgsMLbO1g**# This is the thread that worries me: http://www.thumpertalk.com/forum/showthread.php?t=785425 Thanks in advance for the help!