Honda XL350R 1984 Shop Manual page 69

6.
CYLINDER HEAD/
VALVES
SERVICE INFORMATION 6- 1
TROUBLESHOOTING 6-3
CYLINDER HEAD COVER REMOVAL 6-4
CYLINDER HEAD COVER DISASSEMBLY
6- 4
CAMSHAFT REMOVAL 6-6
CYLINDER HEAD REMOVAL 6- 9
CYLINDER HEAD DISASSEMBLY 6-10
VALVE SEAT INSPECTION AND REFACING
6- 14
CYLINDER HEAD ASSEMBL Y
6- 17
CYLINDER HEAD INSTALLATION
6-18
CAM CHAIN TENSIDNER / CAM SHAFT INSTALLATION
6- 18
CYLINDER HEAD COVER ASSEMBLY 6- 21
CYLINDER HEAD COVER INSTALLATION
6- 21
CYLINDER COMPRESSION INSPECTION
6- 23
SERVICE INFORMATION
GENERA L
• This section covers maint enance of the cylinder head, valves, cam shaft, rocker arms, and sub·rocker arms.
These procedures can be performed w ith the engine in the frame.
• Coat the camshaft bearings wit h clean engine oil to provide initial lubrication.
• Pour clean engine oil into the oil pockets in the cylinder head to lubricate the cam .
SPECI FI CATI ONS
IT EM
STANDARD
SERV ICE LIM IT
Cylind er compression
1,400 kPa (14 .0 kg/ cm
2
•
199 psi)
Camshaft
Cam lobe height
I
IN
30.569
mm
(1.2035
in)
30.37
mm
(1.195
in)
I
EX
30.575
mm
(1 .2037
in)
30.38
mm
(1.196
in)
Run out
0.04 mm (0.002 in)
Rocker arm 1.0.
11 .500- 1 1.51 B
rnm
(0.4528- 0.4535
in)
11.53
mm
(0.454
in)
Sub rocker arm I.D .
I
IN
8.000- 8.015 mm (0.3150 0 .3 155 in)
8.05 mm (0.317 in)
I
EX
7.000- 7.015 mm (0 _ 2756- 0.276 1 in)
7.05 mm (0.277 in)
Rocker arm shaft 0.0.
11.466- 11.484 mm (0.45 14- 0.4521 in) 11.41 mm (0.449 in)
Sub rocker arm shaft D .D.
IN 7.969- 7.972 mm (0.3137 - 0 .3139 in) 7.92 mm (0.312 in)
EX
6.969- 6 .972 mm (0.2744-0.2745 in) 6.92 mm (0.272 in)
Rocker arm shaft-to·arm clearance 0.D16
0 .052 mm (0.0006 0 .0020 in)
0.10 mm (0.004 i n)
Sub rocker arm shaft-to·arm clearance
0.028- 0 .046 mm (0.00 11 - 0.00 18 in)
0.10 mm (0.004 in)
Val ve spring Free length
Inner 35.7 mm (1.4055 in)
34.60 mm (1.362 i n)
Outer
41.1 mm (1 .6181 in) 40 .16 mm (1.575 in)
Preload/length
In ner 4.7
+
0 .3 kg/ 31 .5 mm (10.4 ± 0.7 Ib/ 1.24 in)
Outer
13.7
+
0.7 kg/ 35 mm (30.2
of
1.5Ib/ 1.38 in)
6-1
iii