It's a 3 layer gasket, don't know what the point of that is lol. Noticed it had lost a lot of coolant though so could of have been down to that or might have been running lean as the jublie clip holding the carb on was loose. Doesn't look heat related though but could be, don't have a temp gauge so don't know.
You can see it's nipped the ring up on the inlet side though and bent it round so may also be down to naff parts. The ring I got for it was "namura" I've heard bad things about their pistons lol so could be down to that. Surprisingly after it went bang I managed to make it about half a mile before it completely gave up lol
**** that was worst than mine when i ****ed my top end
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i blew my dt up ... but i fixed it.... Then i crashed it.... but i didnt fix it right and 2 scouser's come in the middle of the night and left me with a working bike