I wouldn't change a thing on that truck until you get comfortable with it and a throttle return spring is a great idea the device they are talking about is a fail safe it returns the throttle servo back to idle if your battries go out they are both worth having and do just as the dvd say's about break in you have to break in all rc engines you get more performance and longer life if you do a proper break in what type a fuel are you running in it I suggest sidewinder 30/12 it has high nitro content and good lubercation
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