I have a 1977 70hp Johnson 
I have a 1977 70hp Johnson (70EL77s) that had the lower end replaced. The guy I bought it from said that the original was a "hydro assist" and the current one is "mechanical" How can I be sure of what model was orginally on this motor? Will this make a difference when it comes time to rebuild the water pump?
I have a 1977 70hp Johnson (70EL77s) that had the lower end replaced. The guy I bought it from said that the original was a "hydro assist" and the current one is "mechanical" How can I be sure of what model was orginally on this motor? Will this make a difference when it comes time to rebuild the water pump?