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You may have high resistance which cause a lot of heat. Melting wires, burning motor brushes or debris that got stuck in the motor that is burning. Also, if you're motor is pulling a spring that is more than it can pull, that can also cause a lot of heat which will also look the same. Pull out the motor and inspect the commutator for burn/carbon marks. Upgrade to low resistance wires, deans connectors and a basic mosfet if the problem is electrical resistance. Upgrade to a high torque motor, high torque gears or a lower power spring if you have mechanical resistance. Hope that helps.
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