Due to the crank case leaking i'm rebuilding my engine. Here's what the pistons look like;

This is the rear cylinder;





This is the front cylinder;



The engine has done 115km, most of which was covered on a trackday in very wet weather. It was running on 30:1 premix with BP Ultimate 98. Main jets are 195 (rear cyl) and 198 (front cyl).

This looks like detonation to me, what do you think?
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