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WR300: Do I have to change the piston soon ? (pictures attached)

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Hi all,
yesterday I took the pipe out and made some photos of the piston, please have a look:

 

 

Bike is a WR300 2010, I bought it second hand and don't really know the hours / kms on it, seems to be the original piston.

 
I think the piston is not too bad, machining rings are still there on the skirt, there is a spot under the second ring that is shiny.. I think there is some blowby also and a lot of carbon deposits on top of piston and power valve. My jetting was way rich and I'm using a high flashpoint ester oil at 2% mixture.

What are your insights ?
Thanks.

 

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The piston visually doesn't look bad, but as robertaccio mentioned, there is a good amount of blow by past the rings. Pull the piston, mic it out and if necessary, replace piston and/or rings.

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