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6. CYLINDER HEAD/VALVES K-PIPE 125
SERVICE INFORMATION ..................... 6-1 CYLINDER HEAD DISASSEMBLY ........6-5
TROUBLESHOOTING ............................ 6-3 VALVE/VALVE GUIDE ............................6- 6
CYLINDER HEAD REMOVAL .............. 6-4 CYLINDER HEAD ASSEMBLY ...............6- 6
ROCKER ARM SET REMOVAL ............ 6-4 CYLINDER HEAD INSTALLATION .......6- 7
SERVICE INFORMATION
GENERAL INSTRUCTIONS
· The cylinder head can be serviced with the engine installed in the frame.
· When assembling, apply molybdenum disulfide grease or engine oil to the valve guide movable
parts, valve arm and camshaft sliding surfaces for initial lubrication.
· The valve rocker arm is lubricated with engine oil through the cylinder head engine oil passages.
Clean and unclog the oil passages before cylinder head assembly.
· 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
Item Standard (mm)
IN 0.050.1
Valve clearance (cold)
EX 0.050.1
Compression pressure kg/cm 1115
Cylinder head warpage 0.05
IN 0.100.025
Rocker arm clearance
EX 0.100.025
Rocker arm-to-shaft IN 0.0130.046
clearance EX 0.0130.046
IN 89°90°
Valve seat angle
EX 89°90°
IN 5.455.465
Valve stem O.D.
EX 5.435.445
IN 5.4755.485
Valve guide I.D.
EX 5.4755.485
Valve stem-to-guide IN 0.010.035
clearance EX 0.030.055
6-1