Hoca 50cc QMB139 4-stroke 50mm, Racing Big Bore Cylinder Set. Kit includes cylinder, piston, rings, piston pin, cir clips, head gasket, and base gasket.
 
Please see our Warranty & Returns Policy.
 

We recommend that you use our QMB139 performance cylinder head (see Related Items) with this set as some stock cylinder heads will not fit.

We recommend that you use our QMB139 performance cylinder head (see Related Items) with this set as some stock cylinder heads will not fit.

• Upgrades to 80cc
• Cylinder Bore: 50mm
• Wrist Pin Diameter: 13mm
• Total Piston Height: 34.8mm
• Compression Height (from center of wrist pin hole to top edge of piston): 18.3mm

Jalon X8 Retro 50cc, Panterra Fusion 50cc, Lifan, Qingqi QM50QT-6V, SUNL, Various unlisted makes/models, Strada, Qingqi QM50QT-4G, Baja SC50-P, Schwinn