Those pinions won't work.
Actually, I should clarify, they could work, but not that well. The pitch is closer than others that I have tried, but it still is not exact. The actual gear size is still different. The 10 tooth I bought is about the same size as a 9 tooth XMods gear, and the 13 tooth is about the same size as the 11 tooth XMods gear.
The other problem is that you have to mount the gear with the set screw farthest from the motor. If the motor shaft is too short (a problem on spin brush motors and the 180 motors) the set screw will barely cath the end of the shaft and the pinion will wobble.
They might work on a standard XMods motor, but due to the size, you won't get the full benefit of the higher ratio.
As for the motor, it hasn't been installed in the car yet. It runs very quietly and smoothly, as it has a balanced armature. I do suspect that it is timed to run in the oppposite direction, though, as it sounds better in reverse.
Right now, it does not spin as fast as a stock stage 2, even though it is supposed to be a 30k motor. (That is at 7.2V, however) The Team Orion motor that I tweaked will be faster than this one stock.
Wednesday nights are my nights to test and tune at the roller rink, so I'll have more to report later on tonight or tomorrow.