Cylinder Head/Valves Service Information; Cylinder Head/Valves Specifications; Cylinder Head/Valves Torque Values; Cylinder Head/Valves Tools - Honda CH250 Elite 1986 Service Manual

6. CYLINDER HEAD/VALVES
VALVE GUIDE REPLACEMENT 6-8
VALVE SEAT INSPECTION AND
REFACING 6-9
CYLINDER HEAD ASSEMBLY 6-11
CYLINDER HEAD INSTALLATION 6-12
CAMSHAFT INSTALLATION 6-13
CYLINDER HEAD COVER ASSEMBLY 6-14
CYLINDER HEAD COVER INSTALLATION 6·14
6-3
6-4
6-5
6-6
6-1
6-2
6-3
REMOVAL
LINI)ER HEAD REMOVAL
lINllER HEAD DISASSEMBLY
lINI:>ER HEAD COVER REMOVAL
COVER
SERVICE
INFORMATION
• This section covers maintenance of the cylinder head, valves, camshaft and rocker arms .
• The fuel tank and heat insulator must be removed for service the cylinder head with the engine installed in the frame.
ITEM
STANDARD mm (in)
SERVICE LIMIT
mm (in)
1.241)
11.241)
4.955-4.970 (0.193)
4.975-4.990 10.193)
Cam height
5.00- 5.012 5.03 10.198)
I'--~-'_::"----------r---'-'-+------
0.010-0.037 0.08 10.003)
0.030-0.057 0.10 (0.0041
I - - . -.. ----·-----+-----+--------------------+----~---_l
30.7 27.6 (1.091
Valve
40.1 36.1 (1.421
f---.---'~-.----.-
.
...l..-_.-_+_----.....
--.-.--------~-----_+_---------l
seat width
1.1 1.8 (0.07)
l---_---..---.L.--.--..
--~
.
+ _ _ - . - - - - - - - - - - - - - - . - . - - - + - - - - - -
Cvllndj9r head warpage 0.05 (0.002)
10-14 N'm (1.0-1.4 kg-m, 7-10 ft-Ibl
22 26N-mI2.2-2.6 16-18ft-lbl
8-12 N'm (0.8-1.2 kg-m, 6-9 ft-Ib)
8-12
N·m
(0.8-1.2
kg-m,
6-9 ft-Ibl
8-12
N'm
10.8--1.2 6-9 ft-Ib)
8 ..-22 N·m (1.8-2.2 13-16 ft-Ibl
bolt
8
mm
12
mm
Cy!lnd,ar head cover bolt
Cyiind'er head cap nut
Camshaft holder bolt
Cam chain tensioner
Oil bolt
TOOLS
Valve reamer, 5.0 mm
Valve remover
CommQI1
Valve spring compressor
Valve driver
07984- MA60000
07942 - MA60000
07757 0010000
07743-0020000
6-1