I have the motor with the bigger shaft so no worries. But what do I do since the HV maxx has 2 Battery intakes but I am only running 1 battery.
Short the "battery 1" wires and connect the "battery 2" wires to the battery as normal. It says how do do it more specifically in the manual. You will also need to use an external bec.
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Sub 7lb, lowest CG of any 1/8 buggy