6. CYLINDER HEAD/VALVES ZING II 125 Cylinder Head CYLINDER HEAD DISASSEMBLY Remove the valve spring cotters, retainers, springs, spring seats and valve stem seals using a valve spring compressor. · Be sure to compress the valve springs with a valve spring compressor. · Mark all disassembled parts to ensure correct reassembly. Valve Spring Compressor Remove carbon deposits from the exhaust port and combustion chamber. Combustion Chamber Be careful not to damage the cylinder head mating surface. 6-7