I have a 25 hp Johnson J25ELCTD that ran good until the other day. It got extremely difficult to start and wouldn't idle, however it seemed to run fine at WOT. When I got it home, I noticed alot of oily fluid coming out from under the flywheel. I am sure the upper crankcase seal needs to be replaced, my question is do these symptoms sound like they are because of this seal being bad? Thanks for any input.