QMB139 Cylinder Head Assembly with Emissions Ports. Designed for 50cc 4-stroke engines, this OEM-style replacement matches part numbers 12200-SQ5A-8000, 12200-SQ5A-8200, and 12200-SQ5A-9000. It’s a perfect fit for many popular QMB139/GY6 50cc Chinese scooters equipped with emissions or PAIR-system-style heads.
This complete cylinder head assembly restores proper airflow, compression, and exhaust recirculation—helping your scooter run smoother, cleaner, and more efficiently.
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