a friend gave my husband 2 old boat motors 1 is a 1970 something johnson seahorse 15hp 2stroke tring to find a break down on it for repair.Also gave us a 1950 something firestone 5hp.I got the old seahorse to crank but would like to break her down clean her up and rebuild her.The Firestone will try to turn over but not sure if i can fix what ever is wrong any suggestions: