RPMs so high that the machine could tip over if stopped at full speed. A vehicle like this needs to have torque as it is one of the main reasons chains are used in the first place. Range drops within 30 feet in an open field. Battery covers are unnecessarily difficult to remove and the car battery is pretty low. You need to set it to a specific mode to charge; does not charge when switching on and off! To do this, think of one extra step. The frame construction of the first two models is extremely weak for the forces that these engines transmit. With a loose joint and insane engine revs, it managed to split in half as it hit the threshold. Great if you want the control box as is, but it's not the perfect kit for those who don't have the patience and low expectations.
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