if the esc came with 1 on its generally for a reason.
but i ran a lsi excelorin sensored esc in my 2wd buggy with out it on and was fine.
best way to fined out is to do a 5 min practice and check the esc after that and see if its warm if not then it shouldnt be a problem.
so long as your gearing is not to high to put presure on your motor (hence over heating)which then puts presure on the esc to over heat and also reasonable batteries should be no problems.
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