I RECENTLY BOUGHT A USED JOHNSON 8HP FROM A FRIEND OF A FRIEND.THE YEAR OF THE MOTOR IS UNKOWN BUT I HAVE THE MODEL #J8RCEC AND THE SERIAL #B7955675.WHAT I WOULD LIKE TO KNOW IS THE YEAR OF THIS MOTOR,AND IF IT IS POSSIBLE TO BUY A AIR BOX FOR IT?ANY HELP WILL BE GREATLY APPRECIATED.