SERVICE INFORMATION
GENERAL
The cylinder and piston can be serviced with the engine installed
in
the frame.
Take
care
not to
damage
the cylinder wal! and piston.
Be
careful not to
damage
the mating surfaces when removing the cylinder.
CYLINDER/PISTON
Rocker arm and valve lubricating oil
is
fed through
the
oil
passage
in the cylinder. Clean the oil
passage
before installing the
cylinder.
SPECIFICATIONS
Unit· mm (in)
I
ITEM
STAN
DARD
SERVICE LIMIT
Cylinder
J.D.
92.000 - 92.010 (3.6220 - 3.6224)
92.10 (3.626)
Out-of~round
- 0.10 (D.004)
Taper
f-
?10
(0.004)
,
Warpage
-
0.10 (0.004)
Piston,
Piston
0.0.
at
15 (0.6) from bottom
91.970 91.990 (3.6209 - 3.6216)
+--
91.90 (3.618)
pis-ton pin,
Piston pin
hole 1.0.
19.002 19.008 (0.7481
0.7483)
19
.04 (0.750)
piston ring
Piston
pin
0.0
.
18.994 19.000 (0.7478 0.7480) 18.9S (0.74S)
Piston-to-piston pin clearance
0.002 - 0.014 (0.0001 -
O.OOOS)
0.08 (0.003)
Piston ring end Top
0.15 0.30 (0.006 0.012) 0.5 (0.02)
9'P
Second 0.30 - 0.45 (0.012 0.016)
O.S
(0.02)
I Piston ring-to-ring
Oil
(side rail )
I
0.20 - 0.70 (0.008 0.026) 0.9 (0.04)
Top
0.030 -
O.OSO
(0.0012 - 0.0024) 0.09 (0.004)
groove clearance
Second
0.030 -
O.OSO
(0.0012 - 0.0024) 0.09 (0.004)
Cylinder-to-piston clearance
0.010 0.040 (9..0004 - 0.0016) 0.10 (0.004)
I
Connecting rod small end 1.0. 19.020 - 19.041 (0.7488 - 0.749S)
__
+-
~"9';.~07
(0.751)
,---
C"ouon"n",e",C1",;n",9
,-"",
ode:-"lo",-p";'~l
uo
on,-"p;"n
-"
'",,le"",,",,,n'V"""--
______
--L_
0"'."'02="0
- 0.047 (0.0008 - 0.0019) 0.10 (0.004) -
TORQUE VALUE
ITEM
Q '
TY
THREAD
DIA
.
(mm)
Cylinder stud bolt
4 10
TROUBLESHOOTING
Comp
r
ession
too
low
, ha
rd
starting
or
poor
performan
ce
at
low
speed
Leaking cylinder head
gasket
• Worn, stuck
or
broken piston ring
• Worn
or
damaged
cylinder and piston
Compress
ion
too
high
,
overheati
ng
or
knocking
• Excessive carbon build-up on piston head
or
combustion
chamber
Excessive
smoke
Worn
cy
linder. piston
or
piston rings
• Improper installation
of
piston rings
• Scored
or
sc
ratched piston
or
cylinder wall
Abnormal
noise
Worn piston pin
or
piston pin hole
Worn connecting rod
small end
• Worn cylinder. piston
or
piston rings
TORQUE
J
REMARKS
N·m
(kgf·m
,
IbHt)
12
(1
.2, 9)
See
page
11-8
11·3
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