GY6 100CC 50mm QMB139 Big Bore cylinder Engine kit with Cylinder, Cylinder head,piston kit, head gasket, base gaskets.

QMB139 50mm Piston Kit 

• Piston Outer Diameter: 50mm

Cylinder Head Gasket 

• 50mm Inside Diameter

Cylinder Gasket GY6 50cc

• Bore: 50mm

Cylinder for GY6 50cc engine

• Bore: 50mm 
  

Cylinder Head

• EGR Style Cylinder Head
• 50mm Bore
• Valve Length: 69mm
  
• Overall Height: 59.5mm
  
•  Intake Port Diameter: 17mm
  
• Exhaust Port Diameter: 18mm 
  
• Exhaust Bolt Hole Spacing: 49.75mm
• Intake Bolt Hole Spacing: 44.75mm