I bought 2 Chinese 49cc scooters a few weeks ago for me and my wife to cruise on. One of them runs good after a new carburetor. The other one Is acting really weird. So when it is cold it starts right up (usually) and after if heats up if I kill it, it will not start back up (even if I use ether). I've replaced the carburetor twice, new spark plug, new rectifier, all new fuel and vacuum lines and new fuel filter. At this point I have EVERY line except for the vacuum and fuel line taken off. The little black electric box next to the battery is also new. I also have the stock air filter taken off and have a new direct to carburetor intake filter installed. I'm not completely stupid with motors, I know that for a motor to run it needs, fuel, spark and air.. at this point it's getting all of those and still doing the same damn thing. ANY help would be greatly appreciated.... I you like me to send pics of ANYTHING just let me know.