SERVICE DATA
2-3
Valve seat
Valve seat angle
30°
Valve sinkage
0.8
[0.031]
0.7 to 0.9
[0.028 to 0.035]
1.3
[0.051]
Seat width
1.18
[0.0465]
1.04 to 1.32
[0.0409 to 0.0520]
1.6
[0.063]
Valve margin
1.7
[0.067]
Refacing
permissible up to
1.2 [0.047]
Valve
spring
Free length
48.85
[1.9232]
47.60
[1.8740]
Perpendicularity
θ
= 1.5°
Δ
= 1.3 [0.051]
Lf = 48.85
[1.9232]
Δ
= 1.5 [0.059]
at the end
Set length/set load
43 mm [1.69 in.]/
176 to 196 N
{18 to 20 kgf}
[130 to 145 lbf]
43 mm [1.69 in.]/
147 N
{15 kgf}
[108 lbf]
Push rod
Runout
0.3
[0.012] or less
Runout (dial gaule reading)
when pushrod is supported
along
center line of spherical sur-
face at
either end.
Cylinder head
Distortion of bottom face
0.05
[0.0020] or less
0.20
[0.0079]
Reface minimum thickness.
Compressed thickness of gasket
1.3
[0.0512]
1.27 to 1.37
[0.0500 to 0.0539]
Piston
Outside diameter
STD
87.970
[3.4634]
87.955 to 87.985
[3.4628 to 3.4640]
87.770
[3.4555]
14 [0.55] upper from the
bottom
right angle to the piston pin.
0.25
[-0.0098] OS
88.220
[3.4732]
88.205 to 88.235
[3.4726 to 3.4738]
88.020
[3.4653]
0.50
[-0.0197] OS
88.470
[3.4831]
88.455 to 88.485
[3.4825 to 3.4837]
88.270
[3.4752]
Protrusion from crankcase
0.13 to 0.60
[0.0051 to 0.0236]
Bearing clearance check.
Weight difference in one engine
5 g [0.20 oz.] or
less
Piston ring
Clearance between
piston ring and ring
groove
No.1 compres-
sion ring
0.060 to 0.100
[0.0024 to 0.0039]
0.200
[0.0079]
Use the piston with replac-
ing
the piston rings until reach-
ing
the limits.
when reaching the limits,
replace the piston.
No.2 compres-
sion ring
0.045 to 0.080
[0.0018 to 0.0031]
0.150
[0.0059]
Oil ring
0.025 to 0.065
[0.0010 to 0.0026]
0.150
[0.0059]
Closed gap of ring
No.1, 2 compres-
sion rings
0.25 to 0.40
[0.0098 to 0.0157]
1.50
[0.0591]
Oil ring
0.30 to 0.50
[0.0118 to 0.0197]
1.50
[0.0591]
Table 2-2 Maintenance service data table - Basic engine (2 / 5)
Unit: mm [in.]
Inspection point
Nominal
Standard
Limit
Remark
Valve
margin
Valve
sinkage
Valve
seat angle
Seat width
ٌ
Lf
ǰ
