6. CYLINDER HEAD/VALVES GRAND DINK 125/150 Straight Edge INSPECTION CYLINDER HEAD Check the spark plug hole and valve areas for cracks. Check the cylinder head for warpage with a straight edge and feeler gauge. Service Limit: 0.05mm repair or replace if over Feeler Gauge VALVE SPRING FREE LENGTH Measure the free length of the inner and outer valve springs. Service Limits: Inner (IN, EX) : 29.3mm replace if below Outer (IN, EX): 32.0mm replace if below 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: 4.925mm replace if below EX: 4.915mm replace if below CYLINDER HEAD ASSEMBLY Install the valve spring seats and stem seals. Lubricate each valve stem with engine oil and insert the valves into the valve guides. Be sure to install new valve stem seals. Valve Spring Compressor 6-8