Piston wash advice & help

I was checking on my pistons yesterday ( looking thru spark plug hole ) and was wondering if the clean spot ( like a circle ) in the middle of the piston is ok or not ?

The rest top of the pistons appears fairly dirty, cant see edges...

Thank you for advice.

Chris
 
no no no ....I was just wondering about the ring in the middle which appears clean.....( i cant see the edges because of the size of the hole )

No lean burn down i hope.
 
Location
Alaska
OK sorry, get one of those single bulb flexible LED lights that you can fit into the plug hole. I use those for my sleds and skis....very handy.
 
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