blasterman

Hi everyone, i've just seized my Yamaha blaster engine as the piston skirt shattered due to piston slap, i've just gauged up the barrel to find its 0.23 mm over the standard bore size, i was just wondering if anyone could tell me what over sized piston to order? Im rubbish with this type of thing and don't understand clearances and stuff i do know the clearance should be 0.02, i would much appreciate if someone could help me out? many thanks Cody.