VALVES AND VALVE SPRINGS
5-27
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.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS1SM9221CHECKING 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
34.85 mm (1.37 in)
Free length (exhaust)
34.86 mm (1.37 in)
Limit
33.11 mm (1.30 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
5-67
EAS1SM9283REMOVING THE CRANKSHAFT ASSEMBLY
1. Remove:
• Crankshaft assembly “1”
TIP
Remove the crankshaft assembly by using the
crankcase separating tool “2”.
EAS1SM9284CHECKING 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.
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
YU-A9642
Runout limit
0.030 mm (0.0012 in)
2
1
Big end side clearance
0.110–0.690 mm (0.0043–0.0272
in)
Crank assembly width
55.95–56.00 mm (2.203–2.205 in)
1
