I find if very unlikely that a a semi-functional Huffy is going to inspire your son to develop an interest in cycling, particularly when he realizes what a piece of trash it is compared to the BMX bikes that other kids are riding. I suggest you bring him to a BMX track where (1) he will find a multitude of friends who are into riding bikes, and (2) you will be presented with a multitude of opportunities to buy a high quality used bike that is properly assembled, safe, mechanically sound, and properly size for your son.