Bottom line and basic engineering FACT the bigger the cable the less voltage drops and less I Squared R Heat loss. Since you only have 6 volts to start with and a heavy starting current draw might reduce that to as low as 4.5 YOU CANT AFFORD TO DROP MUCH VOLTAGE AND HAVE HEAT LOSSES IN THE CABLES, you need all the energy possible discharged in the starter NOT the cables.
So sure, heck a 1 or even 2 gauge cable will work and the starter will turn, but if she needs to start in cold temps, I in good engineering faith and conscience have to advise you use at least a 0 gauge better yet 00.
Your tractor your money your choice, bigger cable (best if not so big it can still fit the termination devices and ends of course) will allow for better cranking however
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