couple things I learned...

have a 400cc arctic cat auto atv

towed a tandem disc quite easily

had the disc loaded with weight to dig in more, that weight did more harm to the disc than the atv.

you really only need to scratch the soil and get seed contact, the dirt doesn't need to be rototilled.

throw that baby in 4wd low and go to town.

I never planted giant plots with a tractor, I'm sure that's a better tool, but for acre or less plots especially 1/2acre or less plots,
a 4wd 400cc+ atv should handle it no problem.

I never had any over heating etc... and we disced in warm weather 90 degrees etc... at times.

my atv has an oil cooler but is air cooled.

good luck!

if/when I buy a new atv disc I want that 4ft king kutter dual disc, you may consider that or the 33" version.