Yamaha WR250F(N), Owner'S Service Manual

Page: 450 / 686

4 - 92
ENG
CRANKCASE AND CRANKSHAFT
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
→
Replace.
Use the dial gauge and a thickness
gauge.
Dial gauge and stand:
YU-3097/90890-01252
Standard <Limit>
Runout
limit: 0.03 mm
(0.0012 in)
0.05 mm
(0.002 in)
Small end
free play: 0.4 ~ 1.0 mm
(0.016 ~ 0.039 in)
2.0 mm
(0.08 in)
Side
clearance: 0.15 ~ 0.45 mm
(0.0059 ~ 0.0177 in)
0.50 mm
(0.02 in)
Crack
width: 55.95 ~ 56.00 mm
(2.203 ~ 2.205 in)
—
Oil strainer
1. Inspect:
●
Oil strainer
Damage
→
Replace.
Oil delivery pipe 2
1. Inspect:
●
Oil delivery pipe 2 1
●
O-ring 2
Damage
→
Replace.
●
Oil orifice
a
Clogged
→
Blow.