6. CYLINDER HEAD/VALVES K-PIPE 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 4.9mm replace if below EX 4.9mm replace if below Measure each valve guide I.D. Service Limits: IN: 5mm replace if over EX: 5mm 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: 0.035mm EX: 0.055mm · If the stem-to-guide clearance exceeds the service limits, replace the guides. · Reface the valve seats whenever the valve guides are replaced. Outer spring Inner spring CYLINDER HEAD ASSEMBLY Lubricate each valve stem with engine oil and Retainer insert the valves into the valve guides. Apply engine oil to the valve stem seals and install them into the valve guides. Be sure to install new valve stem seals. Install the valve spring seats, washers, inner and Stem Seal Valve cotters outer springs, and retainers. Compress the valve springs using the valve spring compressor, then install the valve cotters. · Use the valve spring compressor to compress the springs and do not damage the cylinder head surface. · Install the cotters with the pointed ends facing down. Special Valve Spring Compressor A120E000051 6-6