6. CYLINDER HEAD/VALVES K-XCT 125i SERVICE INFORMATION GENERAL INSTRUCTIONS The cylinder head can be serviced with the engine installed in the frame. Coolant in the radiator and water jacket must be drained first. When assembling, apply molybdenum disulfide grease or engine oil to the valve guide movable parts and valve arm sliding surfaces for initial lubrication. The valve rocker arms are lubricated by engine oil through the cylinder head engine oil passages. Clean and unclog the oil passages before assembling the cylinder head. After disassembly, clean the removed parts and dry them with compressed air before inspection. After removal, mark and arrange the removed parts in order. When assembling, install them in the reverse order of removal. SPECIFICATIONS Unit: mm Item Standard Valve clearance (cold) IN 0.1 EX 0.1 Cylinder head compression pressure 15kg/cm Cylinder head warpage IN 25.965 Camshaft cam height EX 25.810 IN 10.0~10.015 Valve rocker arm I.D. EX 10.0~10.015 Valve rocker arm shaft IN 9.972~9.987 O.D. EX 9.972~9.987 IN 4.975~4.970 Valve stem O.D. EX 4.975~4.970 IN 5.0~5.012 Valve guide I.D. EX 5.0~5.012 Valve stem-to-guide IN 0.010~0.037 clearance EX 0.030~0.057 TORQUE VALUES Cylinder head cover bolt 0.8~0.9 kgf-m Tensioner mounting bolt 0.9 kgf-m Tensioner sealing bolt 0.9 kgf-m Cylinder head cap nut 2 kgf-m Apply engine oil to threads Cylinder head bolt 0.7~1.1 kgf-m 6-2