my 10.5 came off at around the 135oF/57oC degree mark indoors on polished floor on tuesday. Geared on 23/81 (2.6) in the cat. I've been tipped off to bend the ends of the plugs inslightly to enclose the end of the wire. I also installed the supplied power cap not a larger one I've had on for a while. Surely your speedo should thermal out before the melting.
I replaced all the wires on the motor and battery only a few weeks ago. I'll install brand new plugs over the weekend.
Back to my 7.5 which wouldn't run unless I wiggled the A plug. Tonight I stripped it down and had a better look. Turns out the braided wire that attached to the plug was no longer attached. because the plug wiggled it made contact. I had to cut the fibreglass ring that the plugs mount to to remove the A terminal. resoldered it all together and it works again
just need to be careful removing the A plug now since it's not as secure as before inside.
On a side note my speedo refuses to say stuck to the chassis. my dad suggested perhaps it was getting hot and loosing it's stick. Even indoors with no jumps or bumps
I will put my finger underneath it after the next race to prove that one. If this is all down to the speedo I feel a treat in the form of the GT2.0 Pro might be arriving in the post