The "gold" plating is titanium nitride coating which makes the parts last way longer. It makes less friction on the moving parts which in turn should deal with the sometimes ovaling of the crank pin, also its rust resistent. They have them on the crank the pin and the slide in the carb. This feayure you usually find on some engines that cost twice as much and they usually only have the crank done not the pin and slide too. The plug rod and venturi set is sweet to and they made a 6mm restricter. Thats awesome because i have been trying to find 1 smaller than the current 6.5mm. The heads have the vent holes as is what most guys want also. I think they did an awesome job with these new mills. Now I just have to figure out which 1 I am going to get 1st lol. Also that LSN looked pretty short maybe they will tune easier more "traditional". For guys who have had trouble before.