Universal Parts QMB139 Cylinder & Head Kit | 39/47/50mm
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Original price
$0.00
Original price
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$84.00
$84.00
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$84.00
Current price
$84.00
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Complete 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) — select at checkout
- Cylinder sleeve OD: 45mm (39mm bore) / 52.8mm (47mm bore) / 53.95mm (50mm bore)
- Wrist pin diameter: 13mm
- Total piston height: 34.4mm
- Compression height (wrist pin center to piston top): 17.25mm
- Intake and exhaust valve length: 64mm
- Non-emissions head
- Weight: 4.75–5 lbs (varies by bore)
- QMB139 (139QMB) 49cc / 50cc 4-stroke
- Genuine Buddy 50, RoughHouse 50, Rattler 50, and other QMB139-powered scooters
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