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Continue to ChatCylinder Block Assembly - Big Bore, GY6, 50cc to 110cc, 50mm, 12pc - 20A8950 - PBC1603F1 - https://www.giovanni-bikes.com/express-parts-catalog/engines-parts-upgrades/cylinder-block-assembly-big-bore-gy6-50cc-to-110cc-50mm-12pc-20a8950-pbc1603f1