Originally posted by Top Gun 777
No it is not, actualy it is shows that your engine is running in it's best performance-temperature etc.
It should be realy shiny dark. If it is not shiny-it means the fuel blend you use isn't the best fuel.
This is one of the way I am checking cobustion chambers on my engines. After 3-4 tanks of fuel at racing tunning, I can see on piston how my ports are working and what correction has to be done for best performance.
If the is no warnish bilt up ( shiny surface), I will recomend do not polish it. Only if you see real build up, then you can try to remove it by corse piece of fabric. And do it on flat surface.
thanks for the great tip!!! im pretty sure mine was like half shiny lol how shiny does it have to be? maybe i needed more light in it? i run the fuel brand "hot stuff" 16% im not sure if america has heard of this brand.