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

49ccScoot 68,304 10 years ago
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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. Thanks for watching! Please Like, Favorite, and Subscribe for more! ##ScooterDIY #139QMB #GY650

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