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it looks to have four amatur stacks and says "SP" on the can were the shaft comes out and where the pinnion is, i dont know if this means anything. where and how do i look to see if it has bearing and bushings?

whats the turn of this motor, its a BoLINK motor and says "Yokomo" on the end of the can

heres a picture:
http://imageshack.us/photo/my-images/508/rockcrawlers005.jpg/