Looking at the top of the piston, it appears that it had been correctly. Like Mikey said, that is normal. You want that "horse shoe" on top of the piston. That shows you had it at a decent tune at one time and it pionts towards the exhaust port. You cant start a motor that is over rich and dumping all kinds of fuel out the pipe. You have to lean it up on both needles and get it started and then retune to stay running. Your motor is matched fine. Sorry, but if you cant get this thing running and you think you have problems with it by taking it apart and thinking you have something wrong by the way the piston is darker on one side, you really are not that good of a tuner as you claim to be. Novarossi will not warranty your engine because its not defective and shows no signs of bad craftmanship. Lean it out good and check that plug, make sure its not soaked in fuel from rich settings. You must also adjust for weather temps, its getting hot and humid and youll need to lean it out alittle more. The fuel stains are normal and are higher because the motor is Very rich and filling up with fuel. Did you get a hydro-lock when trying to start it at anytime?