I've had my 08 WR450F since October. I had it for about 2 weeks and it started leaking coolant from the weep hole under the water pump. It only leaked when I started the bike and would stop when the bike warmed up. It started out with a couple of drops and just got worse. I replaced all the components of the water pump, impeller shaft, bearings and seals. After only about 4 hours of riding it started leaking again. At first I didn't know if this was normal so I check the forums here and found out it wasn't. I've read numberous threads on this issue of coolant leak and it really helped my with the problem. Today I was talking with another Yamaha rider and he said a guy with a 07 YZ450F does the same thing and he thought it was normal because he is a MX rider and saw Grant Langstons '08 YZ450F doing the same thing. I was wondering if anybody else with a 2008 WR450F is having the same problem and if Yamaha is making leaky bikes now right from the factory? I'm not really happy about it at all.