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  4. Head with valves installed for GY6 139QMB 50cc engine (39mm)

Head with valves installed for GY6 139QMB 50cc engine (39mm)

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Part Number: 20
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This head fits the GY6 139QMB engine with the 39mm piston. Head comes with valves already installed and you choose: 64mm or 69mm length and EGR or non EGR style.
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