Honda CBR125R, Руководство пользователя

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CYLINDER HEAD/VALVES
8-3
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
Unit: mm (in)
TORQUE VALUES
ITEM STANDARD SERVICE LIMIT
Cylinder compression at 530 min
-1
(rpm) 1,343 kPa (13.7 kgf/cm
2
, 195 psi) –
Valve clearance IN 0.06
±
0.02 (0.002
±
0.001) –
EX 0.27
±
0.02 (0.011
±
0.001) –
Valve,
valve guide Valve stem O.D. IN 4.975 – 4.990 (0.1959 – 0.1965) 4.863 (0.1915)
EX 4.965 – 4.980 (0.1955 – 0.1961) 4.853 (0.1911)
Valve guide I.D. IN/EX 5.000 – 5.012 (0.1969 – 0.1973) 5.04 (0.198)
Stem-to-guide
clearance IN 0.010 – 0.037 (0.0004 – 0.0015) 0.065 (0.0026)
EX 0.020 – 0.047 (0.0008 – 0.0019) 0.075 (0.0030)
Valve guide height IN 11.5 – 11.7 (0.45 – 0.46) –
EX 12.3 – 12.5 (0.48 – 0.49) –
Valve seat width IN/EX 0.90 – 1.10 (0.035 – 0.043) 1.50 (0.059)
Valve spring Free length Inner 33.50 (1.319) 31.0 (1.22)
Outer 35.70 (1.406) 34.0 (1.34)
Rocker arm,
rocker arm
shaft Arm I.D. IN/EX 10.000 – 10.015 (0.3937 – 0.3943) 10.10 (0.398)
Shaft O.D. IN/EX 9.972 – 9.987 (0.3926 – 0.3932) 9.75 (0.384)
Arm-to-shaft clear-
ance
IN/EX 0.013 – 0.043 (0.0005 – 0.0017) 0.10 (0.004)
Camshaft Cam lobe height IN 29.316 – 29.556 (1.1542 – 1.1636) 29.05 (1.144)
EX 29.138 – 29.378 (1.1472 – 1.1566) 28.85 (1.136)
Cylinder head warpage – 0.05 (0.002)
Cylinder head cover bolt 10 N·m (1.0 kgf·m, 7 lbf·ft)
Rocker arm shaft stopper bolt 9.0 N·m (0.9 kgf·m, 6.6 lbf·ft)
Camshaft holder mounting nut 29 N·m (3.0 kgf·m, 21 lbf·ft) Apply engine oil to the threads and seating surface.
Cam sprocket mounting bolt 9.0 N·m (0.9 kgf·m, 6.6 lbf·ft)
Cam chain tensioner lifter plug 4.0 N·m (0.4 kgf·m, 3.0 lbf·ft)
Insulator band screw – See page 5-57