VALVES AND VALVE SPRINGS
5-30
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 contact width “c”
again. If the valve seat contact width is out of
specification, reface and lap the valve seat.
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EASB111222CHECKING 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)
40.76 mm (1.60 in)
Limit
38.72 mm (1.52 in)
Free length (exhaust)
36.94 mm (1.45 in)
Limit
35.09 mm (1.38 in)
b. Installed length
Installed compression spring
force (intake)
178.00–204.00 N (18.15–20.80
kgf, 40.01–45.86 lbf)
Installed compression spring
force (exhaust)
124.00–142.00 N (12.64–14.48
kgf, 27.88–31.92 lbf)
Installed length (intake)
34.78 mm (1.37 in)
Installed length (exhaust)
30.83 mm (1.21 in)
Spring tilt (intake)
2.5 °/1.8 mm (2.5 °/0.07 in)
Spring tilt (exhaust)
2.5 °/1.6 mm (2.5 °/0.06 in)
CRANKSHAFT ASSEMBLY AND BALANCER SHAFT
5-70
EASB111283REMOVING THE BALANCER SHAFT
1. Remove:
• Balancer shaft “1”
TIP
Remove the balancer shaft with its flat side “a”
facing the crankshaft.
EASB111284REMOVING THE CRANKSHAFT ASSEMBLY
1. Remove:
• Crankshaft assembly “1”
TIP
Remove the crankshaft assembly by using the
crankcase separating tool “2”.
EASB111285
CHECKING 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 “a”
Out of specification Replace the big end
bearing, crankshaft pin, or connecting rod.
3. Measure:
• Crank assembly width “a”
Out of specification Replace the crank-
shaft. Crankcase separating tool
90890-04152
YU-A9642
1
a
2
1
Runout limit
0.030 mm (0.0012 in)
Big end side clearance
0.150–0.450 mm (0.0059–0.0177
in)
Crank assembly width
61.95–62.00 mm (2.439–2.441 in)
