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this is special design for  most GY6 50cc engine also include QJ139QMB 50cc 4 stroke engine too.the cylinder sleeve outer diameter is 50mm,will make your engine upto 72cc (80cc),also will fit to VENTO,Roketa,Baja Motorsports,SYM Mio 50cc

This kit include

47mm cylinder + Piston +Piston Rings (from RIK Japan),wrist pin , clips & Gasket 

will fit to following GY6 & 139QMB 50cc base engine

 

Kymco: Freeway 50,Filly 50cc,Agility 50cc NEW DINK 50 4T - PEOPLE S 50 4T - SUPER 8 50 4T

 

GARELLI: CAPRI - CICLONE

Taishan:Sport 50cc,Commuter 50cc

Baotian:50QT-9,50QT-11

Sinski:XSJ50QT-B,XSJ50QT-6

Dotera:50QT-11

Jalon:JL50QT-18

 

GEELY: Sportster 50, Runner 50,

 

 

GIANTCO: Sprint 50

 

 

JALON: JL50QT-18

 

 

JINLUN: JL50QT-4

 

 

JPS RACING: QT50

 

 

KINROAD: XT50QT-6, QT50QT-2

 

 

LIFAN: LF50QT-2A (jet),

 

 

SANLI-SANIFER:  XTR50

 

 

SUKIDA: SK50 QT, SK50QT-21, SK50QT-19, SK50QT-11A

 

 

TAMORETTI: Retro 50

 

 

TIGER: S1 Sports 50

 

 

YAMATI: Jazz 50

 

 

YIYING: YY50QT-15

 

 

WANGYE: 50

 

 

Zhong Hu: 50cc 4t

 

 

ZNEN: Stealth 50

 

 

ZY MOTOR: ZY50QT-7

 

 

Roketa,Baja ,Kazuma, & SYM MIO 50cc and other Chinese Cloned GY6 base 50cc engine

if your model not familiar with your engine, check your engine serial number first.