7. CYLINDER HEAD/VALVES SUPER8 125 VALVE /VALVE GUIDE Inspect each valve for bending, burning, scratches or abnormal stem wear. Check valve movement in the guide. Measure each valve stem O.D. Service Limits: IN : 4.90mm replace if below EX: 4.90mm replace if below Measure each valve guide I.D. Service Limits: IN : 5.03mm replace if over EX: 5.03mm replace if over Subtract each valve stem O.D. from the corresponding guide I.D. to obtain the stem- to-guide clearance. Service Limits: IN : 0.08mm replace if over EX: 0.10mm replace if over If the stem-to-guide clearance exceeds the service limits, replace the cylinder head as necessary. CYLINDER HEAD ASSEMBLY Install the valve spring seats and valve stem seals. Be sure to install new valve stem seals. Lubricate each valve stem with engine oil and insert the valves into the valve guides. Install the valve springs and retainers. Compress the valve springs using the valve spring compressor, then install the valve Valve Spring Compressor cotters. · When assembling, a valve spring compressor must be used. · Install the cotters with the pointed ends facing down from the upper side of the cylinder head. Special Valve Spring Compressor 7-8