This GY6 engine performance cylinder for the GY6 engine 139qma and GY6 engine 139qmb fits:

ADLY BT 50 4T - BAOTIAN Tuning BT/ Eco Bike 50 4T - BAOTIAN Tuning BT49QT-2 50 - BAOTIAN Tuning BT49QT-7 - BAOTIAN Tuning BT49QT-9 - BAOTIAN Tuning BT50QT-11 - BAOTIAN Tuning BT50QT-9 50 - BENZHOU City Star 50 - BENZHOU YY50QT-6 - BUFFOLO Wind 50 - HERKULES/ SACHS 49er - KREIDLER Flory 50 4T - KYMCO Agility euro 2 50 - KYMCO Filly 50 - KYMCO New Dink 50 - KYMCO Nexxon 50 - KYMCO People S 50 -KYMCO People S euro 2 `03 - KYMCO Super 8 50 - KYMCO Vitality 50 - KYMCO Vitality euro 2 50 4T - KYMCO Yager GT 50 - KYMCO Yager GT euro 2 - MSK Eco Bike 50 4T - PEUGEOT V-Clic 50 - REX Capriolo 50 . REX Capriolo/ RS 4T - REX RS 450 - REX RS 500 - RIEJU Paseo 50 - RIEJU Toreo 50 - ZHONGYU QT-5 50 - ZHONGYU QT-7 50 - ZONGSHEN Wind 50 - ZONGSHEN ZS50QT 50 4T AC , and much more Scooter Models with 139QMA or 139QMB engine.

This GY6 engine 139qma / 139qmb performance cylinder is not for legal Street Driving.