Cylinder Disassembly; Camshaft Inspection; Cam Sprocket Teeth Base Contour; Cylinder Cross Section - Honda C50 Shop Manual

20
Figure 3-36.
Cc-~ ·::"·
· e·,;-:
Cam
sprocket
Figure 3- 37. Com sprocket tee h bose contour
Figure 3- 38. C ylinder
Cam chain guide roller
Cam chain guide
rolle r pin
Figure 3- 39. Cyli nder cross section
3. ENG
IN~
a.
The i nlet valve opens at 5° (top dead center for
C50, C50M, C65, C65M l before top dead center of
the piston movement and closes at 30 ° 120° for C50,
C50M, C65, C65Ml after bottom dead ce nter,
per mitting an open duration of 2 15° (200° for C50,
C50M, C65, C65Ml. The exhaust va lve opens at
40° 1 25° for C50, C50M, C65, C65Ml before bottom
d ead center and closes 5° ,!5° before top dead center
'or C50, C50M, C65, C65Ml after top dead center.
- his a llows 225° 1200°-"for C50, C50M, C65, C65M,l
~ '
exhaust valve open duration. This sequence
3- 35 and is called the valve timi ng
spec
io n
R' ht lg en d
die.
Shaft
run out
Cam
height
Left end
bearing die
Right end
bearing die
(Fig.
3- 36)
:ondord Value
29c;m 11.140in.l
- 0.060 1 0.0020 in.)
- 0.073 1 0.0030 in.)
II
5.076 1 0.200 in.)
29 mm 11.1 40 in.l
+0.021
10.0008 in.)
+o.oo 10.000 in.>
II
I
Serviceable limit ·
Rep lace if under
28.8 I 1.135 in.t •
II
Replace if over
0.05 1 0.0020 in.)
Replace if under
4.9 10.190 in.l
Replace i f over
29.06 11.145 in.)
"
121 Cam sprocket root diameter
Standard va lue->53.41 ±0.025 12.104±0.001 in)
Serviceable limit->Replace if under 53.0 12.09 in)
5. CYLINDER
The cylinder is mad e of specia l cast ir on. Th e
inside cyli nder wa ll is exposed to high ' temperatu re
and pressure togeth er w ith th e wearing action of the
reciprocating piston operating at high speed to pro- .
duce a great wearing effect. Added to this, th e dust
in t he air and the forei gn object and the metallic
dust co ntaminating the o il w ill hasten the rate of
wear, th erefore, adequate a ttentio n shou ld be given
to the cleaning of the air filter and the oil change.
A gasket is install ed between th e cylinder and th e
cylinder head to maintain a sea l. (Fig.
3- 37, 3- 38)
a. Disassembly
(1 l Re move the cylinder head in accordance with
section 3.21 a.
1 21 Remove the 6mm cylinde r HS bolts.