Piston; Cylinder Inspection; Cylinder Reassembly; Cylinder Dimensions - Honda C50 Shop Manual

-~..
bore, [ J is for C50, C50M, 550
- . 3---41, 3-42)
:-::- rlo rdvolu e-+44mm [39 mm J 11.750in) [ 1.54in]
+ 0 .02 (0.0008 in)
+0 .01 (0.0004 inl
:e~
·ceobl e limit-+Re poir by reho ning if over
44.1 (1.74 in)
:i"
der oversize
: ·a
dord oversize-+0.25 (0.01 inl
~flinder
barre l
S·a ndord v alue-+62.65 + O (0.0000 in)
(2.47 in)- 0 .1 (0. 004 in)
eo ssem bly
Vhen ossemblying th e cylinder, make sur e t ha t
he cylinder gasket and the two d owel pins ore
i ns oi led.
Inst a ll the cylinder.
PISTON
Th e piston is mode fro m material corr esponding
'o
JIS
AC8B aluminum costing. Th is mate rial is light
o d su itable for high speed, in addition to having
g o od heat conducting property to dissipate the heat ·
rapidly. Furthermore, the coefficient of heat expansion
is small thus minimizing the warpage at elevated tem-
p erature and permitting a- small piston to cylinder
clearance design. The
shop~
of t he piston is on
ellipti cal toper. The head · of the pist on, compa red
o th e skirt, is exposed to higher temperature and
since the expansion is greater, it is toperingly smaller
oword t he to p. The tapering of the piston also
ends to lessen the p.iston slop when the throttle is
lightly snapp ed without the engine being lo aded.
DE
fAD
21
Figure 3- 40. Removing cam chain guide roll er
Figure 3- 41. M easuring cy linder inside d iameter
- - - - - · - - - -
... =
;: :::2
?------------.-~·~
+ o ( -o
.-61.65 _ 0.1 1.47 -0.
Figure 3- 42. Cylinder d imensi ons
Piston
figure 3- 43. Piston