I'min the process of replacing my impeller on my 02 90hp Yamaha but i cant get the lower unit off. I've taken bot bolts out at zinc/skeg location and all four around the body. I've been prying at the front in the pry slot and the seam is separated but it still feels like something is attached inside. I've reviewed a few how-to's and I'm still wondering if I need to detach something else, Linkage etc. Thanks in advance