slick2500
Anything will break if you drive it wrong enough.
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Yeah for sure 13t on a 1730kv motor is under geared I would start with 18t.You might be under-geared, causing the motor to spend too much time near max RPM.
Going to a bigger pinion may reduce temps, as weird as that sounds.
And not trying to stir the pot but 4985 1650kv or 4092 1650kv?