2-3
6. MAINTENANCE STANDARDS
• ENGINE
Unit: mm (in)
Parts
Item
Standard
Service limit
Engine
Idle speed (in neutral)
750 ± 50 min
–1
(rpm)
–
Trolling speed
650 ± 50 min
–1
(rpm)
–
Cylinder compression
1,532 – 1,728
930
[kPa (kgf/cm
2
, psi) at 200 min
–1
(rpm)]
(15.6 – 17.6, 222 – 250)
(9.5, 135)
Compression gap between cylinders
–
200 (2.0, 28)
[kPa (kgf/cm
2
, psi)]
Spark plugs
Gap
1.0 – 1.1 (0.039 – 0.043)
1.3 (0.051)
Valves
Valve clearance
IN
0.21 – 0.25 (0.008 – 0.010)
–
EX
0.28 – 0.32 (0.011 – 0.013)
–
Overall length
IN
108.7 – 109.5 (4.28 – 4.31)
–
EX
108.3 – 109.1 (4.26 – 4.30)
–
Valve O.D.
IN
34.85 – 35.15 (1.372 – 1.384)
–
EX
29.85 – 30.15 (1.175 – 1.187)
–
Stem O.D.
IN
5.475 – 5.485 (0.2156 – 0.2159)
5.445 (0.2144)
EX
5.450 – 5.460 (0.2146 – 0.2150)
5.420 (0.2134)
Stem-to-guide clearance
IN
0.030 – 0.055 (0.0012 – 0.0022)
0.08 (0.003)
EX
0.055 – 0.080 (0.0022 – 0.0031)
0.11 (0.004)
Valve seats
Seat width
IN/EX
1.25 – 1.55 (0.049 – 0.061)
2.0 (0.08)
Seat installation height
IN/EX
44.0 – 44.6 (1.73 – 1.76)
–
Valve guides
Guide I.D.
IN/EX
5.51 – 5.53 (0.217 – 0.218)
5.55 (0.219)
Guide extrusion amount
IN
15.2 – 16.2 (0.60 – 0.64)
–
EX
15.5 – 16.5 (0.61 – 0.65)
–
Valve springs
Free length
IN
49.64 (1.954)
–
EX
49.64 (1.954)
–
Rocker arms
Rocker arm I.D.
IN
17.019 – 17.035 (0.6700 – 0.6707)
–
EX
17.012 – 17.039 (0.6698 – 0.6708)
–
Rocker arm shaft O.D.
IN/EX
16.983 – 16.994 (0.6686 – 0.6690)
–
Rocker arm-to-rocker arm
IN
0.025 – 0.052 (0.0010 – 0.0020)
0.08 (0.003)
shaft clearance
EX
0.018 – 0.056 (0.0007 – 0.0022)
0.08 (0.003)
Pistons
Skirt O.D.
A
86.98 – 86.99 (3.4244 – 3.4248)
86.93 (3.4224)
B
86.97 – 86.98 (3.4240 – 3.4244)
86.92 (3.4220)
Piston-to-cylinder clearance
0.02 – 0.04 (0.001 – 0.002)
0.05 (0.002)
Piston pin bore I.D.
21.960 – 21.963 (0.8646 – 0.8647)
–
