Yamaha 2011 WR250FA, Руководство по эксплуатации для владельца

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5-86
CRANKCASE AND CRANKSHAFT
CHECKING THE TIMING CHAIN AND
TIMING CHAIN GUIDE
1. Inspect:
• Timing chain
Cracks/stiff
→
Replace the timing chain and
camshaft sprocket as a set.
2. Inspect:
• Timing chain guide
Wear/damage
→
Replace.
CHECKING THE CRANKCASE
1. Inspect:
• Contacting surface "a"
Scratches
→
Replace.
• Engine mounting boss "b", crankcase
Cracks/damage
→
Replace.
2. Inspect:
• Bearing
Rotate inner race with a finger.
Rough spot/seizure
→
Replace.
3. Inspect:
• Oil seal
Damage
→
Replace.
CHECKING THE 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 lim-
it:
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 clear-
ance: 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)
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