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Precision-engineered in Taiwan
and outlast standard plastic guides
Premium EPDM Construction: Built with Ethylene Propylene Diene Monomer for superior heat resistance and flexibility
YP400 Aprilia Leonardo 250
OEM Component Compatible: Works with stock electric start
Universal Parts QMB139 Cylinder & Head Kit | 39/47/50mm 43cc Precision-engineered in TaiwanComplete cylinder and head kit for QMB139 4 stroke 50cc engines. Choose from 39mm (stock), 47mm (72cc upgrade), or 50mm (81. 3cc upgrade) bore from the drop down. Includes everything needed for a full top end rebuild. Note: larger bore sizes may require engine case modification. Kit includes: complete cylinder head, cylinder, piston, rings, piston pin, circlips, head gasket, and base gasket. Cylinder bore: 39mm (stock) 47mm (72cc) 50mm (81. 3cc)
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