EMGO air filter fits 139QMB carbs for upgrade with jet.

Need more power get better air flow with HP Air Filter. Best and easiest fit is 39mm EMGO filters.

Does fit the four stroke carbs on 139QMB. Fits good and adds performance when doing upgrades or as a replacement for stock when straving for air.

You will have to use a bigger carb or larger main jet for best performance. More air more gas more power.

This engine (139QMB) is used in scooters from Kymco, Diamo, Schwinn, Q Link Geely, Roketa, Tank, Avanti, Meitian, Strada Verucci Pep boys and most 50cc four stroke scooters plus many others made in China.

Use this filter when upgrading two stroke carbs at 19 and 22mm.