i HAVE THIS 15 HP JOHNSON OUTBOARD I BOUGHT WITH THIS BOAT, THE PROBLEM IS I CAN'T TELL THE YEAR OF THE MOTOR? YOU CAN'T READ THE TAG ON IT, AND I LOOKED ON THE TOP OF THE MOTOR AT THE SILVER PLUG AND THERES NOTHING ON IT. ALL I KNOW IS IT NEEDS NEW COILS AND THEY ARE SINGLE POST. CAN ANYONE HELP? I DON'T NO WHAT TO DO.