I'm stil trying to sort out this oil leak, I have replaced everything there yet it still leaks??? I'm talking about part number 18 on this microfiche, For the oil pump.I've replaced the hose,the dowel,the oring and the screw and it STILL leaks! I don't know what the problem is. I thought maybe that the case had worn in that spot but it looks good, there are no pits or grooves. Has anyone experienced this before?? http://www.powerpartsplus.com/pages/.../2/yamaha.aspx Thanks!