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That motor isnt even rated for 3S let alone 4S. I would not do it. you're just going to overheat it, blow out a motor bearing, and/or frag your rotor magnets. you're liable to eventually do that on 3S. Have you been tracking your motor temps to make sure you have a gearing ratio that will work with that motor on 3S so you dont burn it up?I just put in a 120A ESC surpass hobby my motor is a castle 1406-7700kv sensored motor max 100.000 rpms .I'm using a 3s battery I want to put my 4s battery in.will my motor handle 4s? All that in my 104001rc 1/10scale buggy
Crazy to say but I have built a 8s Baja I know you guys know it, I will only run it at 6s do to it’s so much power and yes a lot money went into it.Running 4s in a 1/10 scale buggy is pushing it. Be prepared to spend a bunch of money on parts because it isn't built for 4s.