Check For The Flatness Of Cylinder Head & Cylinder; Combustion Chamber Cleaning - PGO G-MAX 50 Service Manual

E. Check for the flatness of cylinder head & cylinder.
Check the flatness of contact surface of cylinder head & cylinder.
Limit of use: If it exceeds 0.1mm
Change a new one.
F. Combustion chamber cleaning
Clean out the carbon piled up in combustion chamber.
Do not scratch the combustion chamber and contact surface of the cylinder during
cleaning operation