CRANKSHAFT (YP250R)
5-118
EAS24180
CHECKING THE TIMING CHAIN AND TIMING
CHAIN GUIDE
1. Check:
• Timing chain
Damage/stiffness → Replace the timing
chain and camshaft sprocket as a set.
2. Check:
• Timing chain guide (intake side)
Damage/wear → Replace.
EAS26060
CHECKING THE CRANKSHAFT AND
CONNECTING ROD
1. Measure:
• Crankshaft runout
Out of specification → Replace the crank-
shaft.
IP
Turn the crankshaft slowly.
2. Measure:
• Big end side clearance
Out of specification → Replace the crank-
shaft.
3. Measure:
• Crankshaft width
Out of specification → Replace the crank-
shaft.
4. Check:
• Crankshaft sprocket “1”
Damage/wear → Replace the crankshaft.
• Bearings “2”
Cracks/damage/wear → Replace the crank-
shaft.
• Oil pump drive gear “3”
Damage/wear → Replace the crankshaft.
5. Check:
• Crankshaft journal
Scratches/wear → Replace the crankshaft.
• Crankshaft journal oil passage
Obstruction → Blow out with compressed air.
Runout limit C
0.030 mm (0.0012 in)
Big end side clearance D
0.350–0.850 mm (0.0138–0.0335
in)
Width A
59.75–59.80 mm (2.352–2.354 in)
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