Cylinder/Piston Service Information; Cylinder/Piston Troubleshooting; Cylinder/Piston Specification - Honda 1988 Z50R Service Manual

SERVICE INFORMATION
TROUBLESHOOTING
CYLINDER REMOVAL
SERVICE INFORMATION
GENERAL
7 - 1
7 - 1
7 -2
7. CYLINDER/ PISTON
PISTON REMOVAL
PISTON IN STALLATION
CYLINDER INSTALLATION
7 -2
7 -5
7-5
• Camshaft lubncation oil is fed to the cylinder head through an orifice In the cylinder head, cylmder and crankcase. Be sure
that this orifice is not clogged and that the O-rings and dowel pins are in place before installing the cylinder.
SPECIFICATION
mm
lin)
ITEM STANDARD
SERVICE LIMIT
Cylinder
1 .0. 39.005 39.015 (1.5356
1.5 360) 39.05 (1.537)
Taper 0.10 (0.004(
Out-ai-round
-
0.10 (0.004)
Warpage across top
-
0.05 (0.002)
Piston, Piston
Piston 0 .0.
38.980 39 .000 fl . 5346
1.5354) 38.90
(1.5321
Pin,
piston
Piston pin bore
13.002 - 13.008 (0.5 119 - 0.5121 13.10
(0.516)
rings
Piston Pi" 0.0. 12.994 - 13.000 (0.5 116 - 0 . 5118) 12.98 (0.511)
Piston-Io-pin clearance
0.002 - 0 .01 4 (0.0001-0.00061 0.08 (0.0031
Piston rlng -to·ring
TOP
0 .015 0.050
(O.0006 0.0020) 0.12 (O.005)
groove clearance
SECOND
0 .015 0.050 10.0006 - 0.0020) 0.12 10.0051
Piston ring end gap 0.10 - 0.30 10.004 - 0.0121 0.50 (0.0201
Cylinder-to-piston clearance 0.010 0 .040 10.0004 0.0016) 0 .1 5 (O.COBI
Connecting rod small end 1.0. 13.016 - 13.034 (0.S124 0.5131) 13.08 {O.SlS)
TORQUE VALUE
Cylinder bolt 10 N-m (1.0 kg -m, 7.2 ft -Ib)
TROUBLESHOOTING
Low or unst able compression
• Worn cylinder or piston rings
Excessive smoke
Worn cylinder, piston, or piston rings
Improper installation 01 piston rings
Scored or scratched piston or cylinder wall
Overheating
Excessive carbon built up on piston or combustion chamber
wall
Knocking or abnormal noise
Worn piston and cylinder
• Excessive carbon build-up
7-1