8. CYLINDER HEAD/VALVES MXU 550EXi /MXU500i CYLINDER HEAD DISASSEMBLY/INSPECTION/ ASSEMBLY Valve Spring Compressor Remove the cylinder head (refer to the "CYLINDER HEAD REMOVAL/INSTALLATION" section in this chapter). Remove the valve spring cotters, retainers, springs, spring seats, oil seals and valves 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. Special tool: Cotters Valve Spring Retainers Valves Valve Spring Compressor A120E00040 Springs Spring Seats Oil Seals 8-24