Yamaha FX Nytro FX10X, Service Manual

Page: 524 / 859

5-71
ENG
CRANKSHAFT AND BALANCER SHAFT
INSPECTION
1. Measure:
• Crankshaft runout
Use the V-blocks and a dial gauge.
Out of specification
→
Replace the crank-
shaft.
Dial gauge:
90890-03097
Dial indicator gauge:
YU-A8428
Crankshaft runout:
0.03 mm (0.0012 in)
2. Inspect:
• Crankshaft journal surfaces
• Crankshaft pin surfaces
• Bearing surfaces
Scratches/wear
→
Replace the crankshaft.
3. Inspect:
• Bearings
Clean and lubricate the bearings, then rotate
the inner race with your finger.
Rough movement
→
Replace.
4. Inspect:
• Balancer drive gear
• Balancer driven gear
Damage/wear
→
Replace the crankshaft
assembly and balancer driven gear as a set.
Excessive noise during operation
→
Replace
the crankshaft assembly and balancer driven
gear as a set.
5. Inspect:
• Primary sheave drive shaft assembly
Damage
→
Replace.
6. Measure:
• Crankshaft-journal-to-crankshaft-journal-
bearing clearance
Out of specification
→
Replace the crankshaft
journal bearings.
Crankshaft-journal-to-crankshaft-
journal-bearing clearance:
0.027 ~ 0.045 mm
(0.0011 ~ 0.0018 in)