Crankshaft - Yamaha YFM250XL(C) Service Manual

4
INSPECTION AND REPAIR

CRANKSHAFT

1.Measure:
Crank width A
Out of specification → Replace or repair.
Crank width:
55.95 ~ 56.00 mm
(2.203 ~ 2.205 in)
Runout c
Out of specification → Replace or repair.
<Runout limit>:
C
1
C
2
Side clearance D
Out of specification → Replace or repair.
Big end side clearance:
0.35 ~ 0.65 mm (0.014 ~ 0.026 in)
Big end radial clearance E
Out of specification → Replace or repair.
Big end radial clearance:
0.010 ~ 0.025 mm
(0.0004 ~ 0.0010 in)
Small end free play F
Out of specification → Replace or repair.
Small end free play:
0.8 ~ 1.0 mm (0.032 ~ 0.040 in)
< Limit>:
2.0 mm (0.08 in)
2.Inspect:
Crankshaft bearings 1
Abnormal noise/Turn roughly/Free play →
Replace.
4 - 36
ENG
: 0.03 mm (0.0012 in)
: 0.06 mm (0.0024 in)