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64mm Or 69mm Valves For 139QMB GY6 50 Scooter Engines

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49ccScoot

More than you ever wanted to know about 64mm vs 69mm valves in 139QMB / 1P39QMB / GY6 50 scooter engines. What does it mean? How can you tell which you have? Why does it matter? All answered in detail.

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##ScooterDIY #139QMB #GY650

posted by axigantartz


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