Removing The Balancer Shaft; Removing The Crankshaft Assembly; Checking The Crankshaft Assembly - Yamaha YZ450F Owner's Service Manual

CRANKSHAFT ASSEMBLY AND BALANCER SHAFT

REMOVING THE BALANCER SHAFT

EASB111283
1. Remove:
• Balancer shaft "1"
TIP
Remove the balancer shaft with its flat side "a"
facing the crankshaft.

REMOVING THE CRANKSHAFT ASSEMBLY

EASB111284
1. Remove:
• Crankshaft assembly "1"
TIP
Remove the crankshaft assembly by using the
crankcase separating tool "2".
Crankcase separating tool
90890-04152
YU-A9642
1
EASB111285

CHECKING THE CRANKSHAFT ASSEMBLY

1. Measure:
• Crankshaft runout
TIP
Turn the crankshaft slowly.
1
a
2. Measure:
• Big end side clearance "a"
2
3. Measure:
• Crank assembly width "a"
5-70
Out of specification  Replace the crank-
shaft, bearing or both.
Runout limit
0.030 mm (0.0012 in)
Out of specification  Replace the big end
bearing, crankshaft pin, or connecting rod.
Big end side clearance
0.150–0.450 mm (0.0059–0.0177
in)
Out of specification  Replace the crank-
shaft.
Crank assembly width
61.95–62.00 mm (2.439–2.441 in)