If it is spinning in the wrong direction then it is wired improperly. Wire it to spin the right direction and then see if it is still making noises.
Also, did you over heat the motor? If you did then a magnet may have come loose in the motor and is rubbing on the stater. Or it might be a bearing.
First get it wired properly. Second, if the sound is still there, check the simple things like a rubbing break part. If it is still making the sound, and nothing on the outside is rubbing, then it is internal like a bearing or magnet problem.
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Current build: Liahona w/ cheap front suspension and suspension seat post. Yescomusa 36v 800w generic front hub motor. 15ah Headway triangle mounted pack. Tronsung 30 amp,
Previous Build:1992 Trek Antelope 800 - Bone Crusher (no suspension) - Yescomusa 800 watt 36 volt front wheel kit. Don't do it! Get suspension!!!