Brushed motor question

[problem child]

We have a vintage class in which we run stock brushed motors. What is the max temp before I have to back off on the gearing?

Thanks!

[nativepaul]

What are the magnets made from? Neodym cook pretty easily, cobalt are much more heat resistant but if there ferrite you really can't hurt them, I built a wireframe on road car using bits of my broken hornet when I was a kid, I rewound the 21 turn stock motor to a 3 turn double and ran it on 12 cells for a while, it would melt the solder on the com and throw a winding after about a minute and a half and needed skimming and new brushes every week but it was hella fast and I never managed to permanently kill that motor, I got tired of the maintenance in the end and put a speed 600 in it which was still stupidly fast but not idioticcrazyinsanestupidmentallyderanged fast and I got bored and went boat racing before I burned it out