Minarelli v1 piston issues

Rick T /
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On my minarelli v1 with a 80cc kit, I've blown pistons on this motor in the past, and now I'm ending up with what looks like excess shrapnel from previous breakage. Is there a way to open up these motors to clean out and ensure this doesn't happen in the future? I've got a brand new top end to install but nervous this is gonna happen again.

Second pic is the new piston that did the damage to the head. I had it running for about 5 mins and this was the result. I did a fresh oil change before the damage.

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