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Item No: PFS-151-258
50mm Big Bore Cylinder Kit for 50cc 4-stroke QMB139 engines. Upgrades to 81.3cc based on a stock stroke of 41.4mm! Includes cylinder, piston, pin, circlips, rings, head gasket and base gasket.
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Item No: PFS-169-54
Hoca 50cc QMB139 4-stroke 50mm, Racing Big Bore Cylinder Set. Kit includes cylinder, piston, rings, piston pin, cir clips, head gasket, and base gasket.
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Item No: PFS-169-70
SSP-G 50cc QMB139 4-stroke 50mm, performance cylinder head.
Please note: replaces Cylinder Heads with 64mm Valves (Short Valve Style).
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