I have an 04 wr 450. There is just under 1000km (600miles) on it. I have changed the oil several times. This is the first time checking the valves. I checked the valves and noticed only the middle valve on the intake was good(within specs). The two outside ones were both too tight. Both exhaust valves were too tight also. Is this normal? I thought, if anything, they would loosen up after some use. I did not expect to see them without enough clearance. I checked 3 times to be safe. The piston was TDC, I looked at the marks on the cam chain sprocket to verify. Any comments would be appreciated. Thanks S.