Honda Metropolitan CHF50 Service Manual page 143

CYLINDER HEAD/VALVES
SERVICE INFORMATION
GENERAL
• This section covers service of the cylinder head, valves, rocker arms and camshaft.
• The cylinder head and valves can be serviced with the engine installed in the frame.
• 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 passages in the cylinder head. Clean the oil passages before
assembling cylinder head.
• Be careful not to damage the mating surfaces when removing the cylinder head cover and cylinder head.
SPECIFICATIONS
Unit: mm (in)
ITEM
Cylinder compression
Cylinder head warpage
Valve, valve
guide
Valve clearance
Valve stem O.D.
Valve guide I.D.
Stem-to-guide
clearance
Valve guide projection
above cylinder head
Valve seat width
Valve spring free length
Rocker arm
Camshaft
Rocker arm I.D.
Rocker arm shaft O.D.
IN
EX
IN
EX
IN/EX
IN
EX
IN
EX
IN/EX
IN/EX
IN/EX
IN/EX
Side spring free length
Cam lobe height
[P-type]
IN
EX
IN
EX
STANDARD
1,393 kPa (14.2 kgf/cm
2
, 202 psi)
at 1,500 rpm
-
0.1010.03(0.004 + 0.001)
0.19 ±0.03 (0.007 + 0.001)
4.475 - 4.490 (0.1762 - 0.1768)
4.465 - 4.480 (0.1758 - 0.1764)
4.500 - 4.512 (0.1772 - 0.1776)
0.010 - 0.037 (0.0004 - 0.0015)
0.020 - 0.047 (0.0008 - 0.0019)
9.05-9.35(0.356-0.368)
9.05-9.35(0.356-0.368)
1.0 (0.04)
33.5 (1.32)
10.000 - 10.015 (0.3937 - 0.3943)
9.972 - 9.987 (0.3926 - 0.3932)
16.5(0.65)
29.2365-29.3165(1.15104-1.15419)
29.2907 - 29.3707 (1.15318 - 1.15633)
27.8909 - 27.9709 (1.09806 - 1.10121)
27.9503 - 28.0303 (1.10040 - 1.10355)
SERVICE LIMIT
—
0.05 (0.002)
-
-
4.465 (0.1758)
4.455(0.1754)
4.54(0.179)
0.075 (0.0030)
0.085 (0.0033)
-
-
1.5 (0.06)
32.2 (1.27)
10.10 (0.400)
9.91 (0.390)
15(0.6)
29.2065(1.14986)
29.2607(1.15199)
27.8623 (1.09694)
27.9217(1.09928)
TORQUE VALUES
Cylinder head bolt
Cam sprocket bolt
Cam chain tensioner lifter screw
('02 - '05 model)
PCV joint bolt (After '05 model)
Spark plug
12 N-m (1.2 kgf-m, 9 Ibfft)
8.8 N-m (0.9 kgf-m, 6.5 Ibfft)
3.9 N-m (0.4 kgf-m, 2.9 Ibfft)
10 N-m (1.0 kgf-m, 7 Ibfft)
12 N-m (1.2 k g f m , 9 Ibfft)
Apply oil to the threads and flange surface.
Apply oil to the threads and flange surface.
8-3