What does the wiring diagram look like on the motor? Typically swapping any 2 phases reverses the motor but you need to identify which of those wires are phases. I suppose it is possible that this is some sort of wye winding (I have never seen it) and the blue is the neutral but I would not start hooking up wires randomly without knowing for sure what you are looking at. When in doubt, drop it on the counter at a motor shop and have them take a look.
