VALVES AND VALVE SPRINGS
6-27
TIP
While turning the valve lapper, tap and lap the
valve seat.
e. Apply a fine lapping compound to the valve
face, and repeat the above steps.
f. After every lapping step, be sure to clean off
all of the lapping compound from the valve
face and the valve seat.
g. Apply Mechanic’s blueing dye (Dykem) “b”
onto the valve face.
h. Install the valve into the cylinder head.
i. Press the valve through the valve guide and
onto the valve seat to make a clear impres-
sion.
j. Measure the valve seat width “c” again. If the
valve seat width is out of specification,
reface and lap the valve seat.
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EAS2GB2255CHECKING THE VALVE SPRINGS
1. Measure:
• Valve spring free length “a”
Out of specification Replace the valve
spring.2. Measure:
• Compressed valve spring force “a”
Out of specification Replace the valve
spring.
3. Measure:
• Valve spring tilt “a”
Out of specification Replace the valve
spring.
Free length (intake)
36.69 mm (1.44 in)
Limit
35.69 mm (1.41 in)
Free length (exhaust)
34.86 mm (1.37 in)
Limit
33.86 mm (1.33 in)
b. Installed length
Installed compression spring
force (intake)
146.00–168.00 N (14.89–17.13
kgf, 32.82–37.77 lbf)
Installed compression spring
force (exhaust)
137.00–157.00 N (13.97–16.01
kgf, 30.80–35.29 lbf)
Installed length (intake)
31.40 mm (1.24 in)
Installed length (exhaust)
28.50 mm (1.12 in)
Spring tilt (intake)
2.5 °/1.6 mm (2.5 °/0.06 in)
Spring tilt (exhaust)
2.5 °/1.5 mm (2.5 °/0.06 in)
CRANKSHAFT ASSEMBLY AND BALANCER SHAFT
6-74
EAS2GB2320REMOVING THE CRANKSHAFT ASSEMBLY
1. Remove:
• Crankshaft assembly “1”
TIP
Remove the crankshaft assembly by using the
crankcase separating tool “2”.
EAS2GB2321CHECKING THE CRANKSHAFT ASSEMBLY
1. Measure:
• Crankshaft runout
Out of specification Replace the crank-
shaft, bearing or both.
TIP
Turn the crankshaft slowly.2. Measure:
• Big end side clearance D “a”
Out of specification Replace the big end
bearing, crankshaft pin, or connecting rod.
3. Measure:
• Crankshaft width A “a”
Out of specification Replace the crank-
shaft.
4. Check:
• Crankshaft sprocket “1”
Damage Replace the crankshaft.
5. Check:
• Crankshaft journal oil passage
Obstruction Blow out with compressed
air. Crankcase separating tool
90890-04152
Crankcase separating tool
YU-A9642
Runout limit C
0.030 mm (0.0012 in)
2
1
Big end side clearance D
0.150–0.450 mm (0.0059–0.0177
in)
Width A
55.95–56.00 mm (2.203–2.205 in)
1
