motor temps

[Batfish]

I used to run the Lehner basix xl4200 in my XXX-T MF, geared 19/86.
One thing to remember is that everyone is a little different when it comes to the 'touch' test for heat. You're much better off getting a low-cost IR temperature gauge for more accurate (and less-blistering) readings. OFNA, Duratrax, and a few other companies make these deviced. You should check with Mike and see if he can get one for you.
When I first ran my XXX-T with the xl4200, I had it geared 15/86 and the motor topped out at 190F, which was too warm for my liking, and burning to the touch. Once I geared to 19/86, the motor topped out at 165F, which is much more acceptable, but felt no cooler to the touch than 190F. Either one would burn my finger red in less than 3 seconds.
When the temps get that high, it's hard to differentiate between another 10 or 20 degrees.
I always strive to keep the motor temps below 160F. Most posts you will find about maximum temps will state that the motor innards will start to fail at 220F.