Restore lost power and compression with this Complete Cylinder Kit for QMB139 49cc GY6 4-Stroke Engines. This stock replacement top-end kit includes the cylinder, piston, rings, wrist pin, and clips—everything you need for a rebuild, except the gaskets. Perfect for routine maintenance, top-end failure, or loss of compression, this kit fits most Chinese-made 49cc/50cc scooters using the QMB139 engine platform.
- Complete stock bore cylinder kit (49cc) for QMB139 4-stroke engines Includes cylinder, piston, rings (pre-gapped), wrist pin, and clips OEM-style replacement for easy installation Durable cast aluminum construction Ideal for top-end rebuilds, engine refresh, or compression repair Specifications: Engine Type: QMB139 (GY6 49cc / 50cc 4-stroke) Cylinder Bore: 39mm (stock size) Includes: Cylinder, piston, rings, wrist pin, circlips Gaskets not included
