I can't really go down any teeth, because the Lehner has a 1/8" shaft and the smaller pinions are for 5mm ones, so I'm limited to only going up. The last time I ran it was in 105* heat though, so you can't really blame it for heating up, but I've got fans I'm going to install to fix this.

I got my new spurs today, instead of the 12/52 gearing, it'd now be 12/51.....which would be ever so slightly higher. I'll try to work on it tonight a bit, maybe even get it running again. :)