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Get it between 2025-03-12 to 2025-03-19. Additional 3 business days for provincial shipping.
Use Large Valve Heads to Get More Power for Your GY6 139QMB 139QMA 147QMD Scooter ATV Go Kart Engine!!
This Big Bore Rebuild Kit Comes with 18.5/20.5mm Large Valve Cylinder Head Assy (Stock is 16/18.5mm).
Compatible with 69mm Long Valve Style Heads. If your Original Head Has 64mm Valves, Please Must Change Your Rocker Arms with The Ones in Our Kit.
Glixal Piston Rings: DLC Wear Resistant Coating. This Coating will Also Reduce the Friction Coefficient to Protect the Cylinder Sleeve.
Please Note: The Engine Side Cover Gasket is for a Short Case Version (8 Bolt).
1.100% Brand New Products 2. This Big Bore Rebuild Kit is Suitable for GY6 49cc 50cc 139QMB 139QMA Based Engine 3.Fits Most of Chinese Made 4-Stroke Scooters and ATV. Such as JONWAY, JMSTAR, ROKETA, SUNL, TANK, PEACE, TAOTAO,JCL,Coolsport,Kazuma,ZNEN,YIBEN,BENZHOU