I´m having problems with a certain seal on my 450. It´s the seal on the left side of the bike that goes around the clutch rod, just forward of the sprocket. It started to push out and then oil leaks past it. I tried replacing it, but it only took a few weeks before the problem sprang up again. Right now I have it sort of glued in using a really sticky seal and gasket stuff I got from a gas station, but that doesn´t really explain the underlying problem. Anyone have any ideas?