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Continue to ChatCylinder Head Assembly - Big Bore, CNC, Dual Valve, Pocket Bike, 49cc, Air Cooled - 20P8490BU - PBC1755F1 - https://www.pocketbikecanada.org/express-parts-catalog/engines-parts-upgrades/cylinder-head-assembly-big-bore-cnc-dual-valve-pocket-bike-49cc-air-cooled-20p8490bu-pbc1755f1