ah it's the motor?! so, did he ever let the armature get in sight of a comm lathe? did he renew the diff's? try to check on all the ballbearings... the xx-4 causes alot of stress to the electronics when the maintenance isent done well.
and if you want a motor that does not overheat that fast... try one with the new checkpoint can.
we run them this summer in xx-4's/ mr4-bx @ 36°C outside and with 4200er shv cells, and they do the job.
i hope that will help, otherwise feel free to ask more or pm.
greets marco
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2x xxx-BK, xx4-we, 2x MR4-BX, TC3
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