Removing The Balancer Shaft; Removing The Crankshaft Assembly; Checking The Crankshaft Assembly - Yamaha WR450FB 2012 Owner's Service Manual

CRANKSHAFT ASSEMBLY AND BALANCER SHAFT
EAS1DX3195

REMOVING THE BALANCER SHAFT

1. Remove:
• Balancer shaft "1"
TIP
Remove the balancer shaft with its flat side "a"
facing the crankshaft.
EAS26000

REMOVING THE CRANKSHAFT ASSEMBLY

1. Remove:
• Crankshaft assembly "1"
TIP
Remove the crankshaft assembly by using the
crankcase separating tool "2".
Crankcase separating tool
90890-04152
Crankcase separator
YU-A9642
2
EAS26060

CHECKING THE CRANKSHAFT ASSEMBLY

1. Measure:
TIP
Turn the crankshaft slowly.
1
a
2. Measure:
1
3. Measure:
6-68
• Crankshaft runout
Out of specification
shaft, bearing or both.
Runout limit C
0.030 mm (0.0012 in)
• Big end side clearance
Out of specification
bearing, crankshaft pin, or connecting rod.
Big end side clearance D
0.150–0.450 mm (0.0059–0.0177
in)
• Crankshaft width
Out of specification
shaft.
Width A
61.95–62.00 mm (2.439–2.441 in)
Replace the crank-
Replace the big end
Replace the crank-