Cylinder Head/Valves Service Information; Cylinder Head/Valves Torque Values - Honda 2003 NPS50 Ruckus Service Manual

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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.
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When disassembling, mark and store the disassembled parts to ensure that they are reinstalled in their original loca­
tions.
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Clean all disassembled parts with cleaning solvent and dry them by blowing them off with compressed air before
i nspection.
Camshaft and rocker arm lu bricating oil is fed through oil passages in the cylinder head. Clean the oil passages before
assembling the cylinder head.
Be careful not to damage the mating surfaces when removing the cylinder head cover and cylinder head.
SPECIFICATIONS
ITEM
Cylinder compression
Cylinder head warpage
Valve, valve Valve clearance
guide
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 Rocker arm l.D.
Rocker arm shaft O.D.
Side spring free length
Camshaft Cam lobe height
TORQUE VALUES
Cylinder head bolt
Cam sprocket bolt
Cam chain tensioner lifter screw
Spark plug
PCV joint bolt (After '05 model)
±
1 ,393 kPa (14.2 kgf/cm', 202 psi)
±
at 1 ,500 rpm
I
I N 0.10 0.03 (0.004
EX 0.19 0.03 (0.007
IN 4.475 - 4.490 (0.1762 - 0.1768)
EX 4.465 4.480 (0.1758
I
I N/EX
4.500 - 4.512 (0.1772 - 0. 1 776)
I N 0.010
0.037 (0.0004
EX
0.020 - 0.047 (0.0008 - 0.0019)
I N 9.05 9.35 (0.356
EX 9.05 - 9.35 (0.356 - 0.368)
I
I N/EX 1.0 (0.04)
IN/EX 33.5 (1.32)
IN/EX 10.000 - 10.015 (0.3937 - 0.3943)
I
IN/EX 9.972 - 9.987 (0.3926
1 6.0 (0.63)
IN 29.2365
EX 29.2907 - 29.3707 (1.15318 - 1. 1 5633)
1 2 N·m (1.2 kgf·m, 9 lbf·ft)
8.8 N·m (0.9 kgf·m, 6.5 lbf·ft)
4.2 N·m (0.43 kgf·m, 3.1 lbf·ft)
1 2 N·m (1.2 kgf·m, 9 lbf·ft)
10 N·m (1.0 kgf·m, 7 lbf·ft)
CYLINDER HEAD/VALVES
STANDARD
±
±
0.001)
0.001 )
0.1764)
0.0015)
0.368)
0.3932)
29.3165 ( 1.15104- 1.15419)
Apply oil to the threads and flange surface.
Apply oil to the threads and flange surface.
Unit · mm (in)
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)
14.5 (0.57)
29.2065 (1.14986)
29.2607 (1.15199)
9-3