Want to hit 50mph? Keep up with traffic? This 100cc big bore will allow you to do just that. Will require upjetting. Great match with the 50cc performance exhaust. High quality kit includes all gaskets to install, fits all QMB136 50cc engines.
 
Bore Specs:
Inner Diameter of Cylinder: 50mm
Outer Diameter of Piston Pin: 13mm
 
No returns on performance engine parts.
Please consult a professional if you unsure how to install