I have just fitted a '03 YZ450 exhaust cam to my 400. I have also fitted a new OEM cam chain. The cam chain does not enter the teeth of the cam shafts as far as I expected - see accompanying photos. http://i305.photobucket.com/albums/nn215/crookdj/PICT0971.jpg http://i305.photobucket.com/albums/nn215/crookdj/PICT0966.jpg Is this normal ? Any advice most appreciated.