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Continue to ChatPiston and Ring Set - 47cc, 49cc, 44mm, 12 mm, 2 windows (7 pcs) - 30P8432 - PBC1413F1 - https://electricbikeusa.net/express-parts-catalog/engines-parts-upgrades/piston-and-ring-set-47cc-49cc-44mm-12-mm-2-windows-7-pcs-30p8432-pbc1413f1