Yamaha WR426F(N) Owner's Service Manual page 528

CRANKCASE AND CRANKSHAFT
4 - 97
EC4N4201
Crankshaft
1. Measure:
Runout limit a
Small end free play limit b
Connecting rod big end side clearance
c
Crank width d
Out of specification
Use the dial gauge and a thickness
gauge.
Dial gauge and stand:
YU-3097/90890-01252
Standard
Runout 0.03 mm
limit: (0.0012 in)
Small end 0.4 ~ 1.0 mm
free play: (0.016 ~ 0.039 in)
Side 0.15 ~ 0.45 mm
clearance: (0.0059 ~ 0.0177 in)
Crack 61.95 ~ 62.00 mm
width: (2.439 ~ 2.441 in)
Oil strainer
1. Inspect:
Oil strainer
Damage Replace.
Oil delivery pipe
1. Inspect:
Oil delivery pipe
Cracks/damage
Oil delivery pipe holes 1
Clogged Blow out with compressed
air.
ENG
Replace.
<Limit>
0.05 mm
(0.002 in)
2.0 mm
(0.08 in)
0.50 mm
(0.02 in)
—
Replace.