80cc Big Bore Cylinder Kit for QMB 139 Engine

QMB139 performance cylinder kit for 50cc four stroke engines found on many of today's motor scooters such as Jalon, Panterra, Qingqi, Sunl and many others not listed.

Kit Includes

• Cylinder
• Piston
• Piston Ring
• Wrist Pin
  
• Circlips
• Cylinder gasket
• Head Gasket

Specifications

• 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 
• Please see below for measurements

Note: It is recommended that you use our part BT169-70 cylinder head with this set as some stock cylinder heads will not fit.