Originally Posted by Dave H

It’s obviously a brushed motor. Says on the label 21 turn, so a mild modified, a little faster than a 27 turn "stock" brushed motor. The name and graphics are consistent with it being a Trinity motor I think.

It appears to be wired correctly, although I can’t see everything from the one picture. Should run, as it doesn’t look dirty or likely to be worn out.

Could be a hung brush. The brushes are under the springs on each side. Try checking to make sure the springs are pressing the brushes against the commutator. Try spinning the shaft to help it get going, perhaps the brushes aren’t seated (broken in).

The battery you are using needs to have enough current capability to get it going, that might be an issue.