Break Piston Ring Slot

Hi all, I using 62mm stock piston with jack rod 0.5mm. Rebore std carb, chamber, thailand orange cdi, my prob is why I got crack or breakages on ring piston shoes, 1st I used x1r block n piston(forged) break, 2nd used oem hong leong can stands only 5 days, 3rd tym also using oem piston ring n stands 2 days, 3 tym change piston ring with x1r block, block no sign or problem, yesterday 1 buy 62mm shark block n piston set but stands only 1 day. All is about piston set gone, Could please help me...



Break Piston Ring Slot



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