7. CYLINDER HEAD/CYLINDER/PISTON ATV 50 Combustion Chamber COMBUSTION CHAMBER DECABONIZING Remove the carbon deposits from the combustion chamber Avoid damaging the combustion cham- ber wall and cylinder mating surface. Mating Surface CYLINDER HEAD INSPECTION Check the cylinder head for warpage with a straight edge and feeler gauge. Service Limit: 0.1 mm (0.004 in) replace if over Cylinder head Gasket CYLINDER HEAD INSTALLATION Install the cylinder head on the cylinder properly. Be careful not to damage the mating surfaces. Install a new cylinder head gasket onto the cylinder. 7-4