I've been wrestling with my tilt motor for several days and have decided about the only way out is to replace it, but can't find a part number in my service manual. It's on a 1975 johnson 115 v4. The book shows 2 kinds, fast track and conventional. I have conventional and apparently a prestolite motor. I've found several on ebay but not sure what part number I am trying to replace. Any help? blt