I see the hole saw on the table.
So all you need to do is look at the bottom of the block and these people should never be allowed to race any where again.
Since that probably isn't going to happen i would at least ban him from the track he gets caught at.
Next option is to make his life as miserable as possible. Tech his engine each and every time he comes back.
In fact tech his engine before you let him or his kids race.
That means the engine comes off the kart, and gets completely taken apart right down to the wrist pin.
If he refuses tech don't let him come back.
His name should also be posted for the world to see.
Nobody has ever said the 206 did not need to be teched!!!