Hi. Way back in July 2010 someone named Chipmonger asked if he could mill his 49cc 4 stroke engine head. Someone replied, "What 4 stroke engine do you have? What kit or gearbox? The Honda GX50 and the Chinese copy have a one piece head and cylinder." I was thinking about getting a Huasheng 49cc kit to put in my cruiser bike. I, too, live in Arizona where the limit is 48cc. Was that person saying that because the head and cylinder are 1 piece, the head can't be milled? Because that's exactly what I was thinking of doing. Is there any other way to lose that 1 cc if that won't work, like putting in a different piston with a bigger top or ??? Any help anyone can give me would be very much appreciated. I don't have much money, and I want to have all my ducks in a row before I buy something I can't use.