To dream of a yam is a reminder to think of memories of celebration and family gatherings.
To dream of a motorcycle signifies your need to be on your own and seek out adventure. This is a manifestation of how you are avoiding responsibility. This dream is also symbolic of maturity and sexuality.
To dream that you are on a speeding motorcycle denotes that you are overly impatient. You want to get things as fast as possible.
To dream of Yantra is a symbol of the greater workings of your waking life. A spiritual quest may be about to dawn on you.
To dream of Yantric symbols and Mandalas is a reminder to be aware of the details. Keep your heart open to further understanding and a deeper spiritual purpose of your life.