Starter motors are small, overdriven, and hence are not designed to operate continuously or frequently.
If you can modify your starter and replace the motor in it with one of equal HP and RPM, then this problem will be solved.
Electric motors are always designed with a time rating similar to their expected application. Car starter motors are probably expected to be operated a few times per day, but in many cases, they are just operated twice, and only for about a second.
Find a motor with a longer "time rating". It will be bigger, heavier, and it will cost more, but it will be able to handle the additional work.
The time rating of an electric motor is determined by its ability to stay cool. If it takes 5 seconds to start overheating, then the time rating of the motor is 5 seconds (4 just to be safe), and it will burn out if left on longer than 5 seconds.
Cooling the motor will increase the time rating.
I hope that helps.
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