Yamaha YZ 2018 Series, Owner'S Service Manual

Page: 269 / 402

CRANKSHAFT ASSEMBLY AND BALANCER SHAFT
5-72
EASB29B284
REMOVING THE CRANKSHAFT ASSEMBLY
1. Remove:
• Crankshaft assembly “1”
TIP
Remove the crankshaft assembly by using the
crankcase separating tool “2”.
EASB29B285
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
Crankcase separating tool
YU-A9642
Runout limit
0.030 mm (0.0012 in)
2
1
Big end side clearance
0.150–0.450 mm (0.0059–0.0177
in)
Crank assembly width
55.93–56.00 mm (2.202–2.205 in)