I would not suggest wasting money upgrading anything on that kit. HSP and other "junk grade" (pardon the expression but thats what HSP really is...not hating, just calling it like I see it) RCs arent worth putting money into. Id either ditch it now before it becomes a money pit or I would just replace what breaks with factory parts and use it until you get tired of it breaking a lot and then decide to invest in a better hobby grade kit. You can upgrade the motor if you want and I hope you get the most fun out of it as you can but thats my feelings on it and Id be willing to bet most of the other guys on here will say something similar as well. I know thats probably not what you wanted to hear and I apologize if it sounds like I'm hating on your kit, that is not my intention.