Im abit of a newbie to the whole motorized bike scene. I am looking to purchase an engine kit from zbox, It will be going to a schwin stingray, I know it will fit just need to be modified abit. Back one track, I dont know what engine kit to get, the z48cc or the z66cc. How do they run, how fast can they go (out of intresest cause the bike is 20kg), is 48cc and 66cc legal in NSW, cause I am unsure on what is legal and illegal. It is worth the extra money for the 66cc the extra $40? Feedback from anyone with experience with these engine would be great.