Honda CBR125R Owner's Manual page 191

SERVICE INFORMATION
GENERAL
• This section covers service of the cylinder head, valves, rocker arms and camshaft.
• The camshaft service can be done with the engine installed in the frame. The cylinder head service requires engine
removal.
• Be careful not to damage the mating surfaces when removing the cylinder head cover and cylinder head. Do not strike
the cylinder head cover and cylinder head too hard during removal.
• When disassembling, mark and store the disassembled parts to ensure that they are reinstalled in their original loca-
tions.
• Clean all disassembled parts with cleaning solvent and dry them by blowing them off with compressed air before
inspection.
• Camshaft and rocker arm lubricating oil is fed through oil passage in the cylinder head (stud bolt hole) and camshaft
holder. Clean the oil passage before assembling them.
SPECIFICATIONS
Cylinder compression at 530 min
Valve clearance
Valve, Valve stem O.D.
valve guide
Valve guide I.D.
Stem-to-guide
clearance
Valve guide height
Valve seat width
Valve spring Free length
Rocker arm, Arm I.D.
rocker arm
Shaft O.D.
shaft
Arm-to-shaft clear-
ance
Camshaft Cam lobe height
Cylinder head warpage
TORQUE VALUES
Cylinder head cover bolt
Rocker arm shaft stopper bolt
Camshaft holder mounting nut
Cam sprocket mounting bolt
Cam chain tensioner lifter plug
Insulator band screw
ITEM
-1
(rpm)
IN
EX
IN
EX
IN/EX
IN
EX
IN
EX
IN/EX
Inner
Outer
IN/EX
IN/EX
IN/EX
IN
EX
10 N·m (1.0 kgf·m, 7 lbf·ft)
9.0 N·m (0.9 kgf·m, 6.6 lbf·ft)
29 N·m (3.0 kgf·m, 21 lbf·ft)
9.0 N·m (0.9 kgf·m, 6.6 lbf·ft)
4.0 N·m (0.4 kgf·m, 3.0 lbf·ft)
–
CYLINDER HEAD/VALVES
STANDARD
2
1,343 kPa (13.7 kgf/cm , 195 psi)
0.06 ± 0.02 (0.002 ± 0.001)
0.27 ± 0.02 (0.011 ± 0.001)
4.975 – 4.990 (0.1959 – 0.1965)
4.965 – 4.980 (0.1955 – 0.1961)
5.000 – 5.012 (0.1969 – 0.1973)
0.010 – 0.037 (0.0004 – 0.0015)
0.020 – 0.047 (0.0008 – 0.0019)
11.5 – 11.7 (0.45 – 0.46)
12.3 – 12.5 (0.48 – 0.49)
0.90 – 1.10 (0.035 – 0.043)
33.50 (1.319)
35.70 (1.406)
10.000 – 10.015 (0.3937 – 0.3943)
9.972 – 9.987 (0.3926 – 0.3932)
0.013 – 0.043 (0.0005 – 0.0017)
29.316 – 29.556 (1.1542 – 1.1636)
29.138 – 29.378 (1.1472 – 1.1566)
–
Apply engine oil to the threads and seating surface.
See page 5-57
Unit: mm (in)
SERVICE LIMIT
–
–
–
4.863 (0.1915)
4.853 (0.1911)
5.04 (0.198)
0.065 (0.0026)
0.075 (0.0030)
–
–
1.50 (0.059)
31.0 (1.22)
34.0 (1.34)
10.10 (0.398)
9.75 (0.384)
0.10 (0.004)
29.05 (1.144)
28.85 (1.136)
0.05 (0.002)
8-3