Does anyone know what year this Chrysler 15 hp outboard is? It is Model 158H3D and Ser. # 1120. It came as a kicker motor w/ a boat I bought last fall. It starts nice and runs nice but it smokes a little. I have purchased new plugs although the existing ones look real good. I am trying to get a service manual for specs etc. but I don't know what year the motor is. It looks fairly old - like 60's or 70's.
