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Continue to ChatPiston and Ring Set - 150cc, 57.4mm, 15mm, GY6 (9pcs) - 30A8621 - PBC1519F1 - https://www.electricbikeusa.net/express-parts-catalog/engines-parts-upgrades/piston-and-ring-set-150cc-57-4mm-15mm-gy6-9pcs-30a8621-pbc1519f1