Cylinder Bore: 47mm

Non-EGR Cylinder

Installed 69mm Valve

Cylinder Sleeve Outer Diameter: 52.7mm 
Wrist Pin Diameter: 13mm
Total Piston Height: 34.4mm
Compression Height (wrist pin hole to top edge of piston): 17.25mm
Cylinder head&base Gaskets
Left CTV cover gasekts:15.75 Inches(short case)
47mm Pistons sets(Piston, rings, pin, cir clips)
16*13 Roller weights
Head Stud bolts
Oil pump& prokets(33teeth)

QMB139 4-stroke 47mm, Non Emissions（Non EGR） Cylinder Head with 69mm Valves for use with 72cc Big Bore Kit! ****Now you can customize 50cc QMB139 4 stroke big bore engine kits as you need. Then the components can be optionalBore Displacement: 39mm 44mm 47mm 50mm Cylinder Heads: 64mm-EGR 64MM-Non-EGR 69mm-EGR 69mm-Non-EGR Gaskets: Short Cvt Cover case Long CVT cover Case Mufflers: Varieties of ColorsMore please discover here.