I have an 02 YZ250 that is leaking oil. It is coming from around a rubber seal that is to the top left of the water pump. I am not sure what this rubber seal is. It is kinda thick and gives the appearance that it is just stuck to the outside of the case next to the pump. It is Yamaha part number 5CU-11995-00-00 and is listed as a housing seal on the cylinder head diagram. Anyone have any experience with this seal and what it takes to replace it?