CRANKSHAFT (YP250R)
5-119
EAS25580
CHECKING THE CRANKCASE
1. Thoroughly wash the crankcase halves in a
mild solvent.
2. Thoroughly clean all the gasket surfaces and
crankcase mating surfaces.
3. Check:
• Crankcase
Cracks/damage → Replace.
• Oil delivery passages
Obstruction → Blow out with compressed air.
EAS37P1067
CHECKING THE BEARING AND OIL SEAL
1. Check:
• Bearing
Clean and lubricate the bearings, and then
rotate the inner race with your finger.
Rough movement → Replace.
EAS37P1068
CHECKING THE OIL STRAINERS
1. Check:
• Oil strainers
Damage → Replace.
Contaminants → Clean with solvent.
EAS26210
INSTALLING THE CRANKSHAFT
1. Lubricate:
• Oil seals
• Bearings
• Oil pump drive gear
2. Install:
• Oil seal “1”
(to the left crankcase)
3. Install:
• Timing chain “1”
IP
Install the timing chain so it is not visible through
the opening “a” in the left crankcase “2”.
4. Install:
• Crankshaft assembly “1”
(to the left crankcase)
IP
Install the crankshaft assembly with the crank-
shaft installer pot “2”, crankshaft installer bolt “3”,
adapter “4”, and spacer “5”.
Recommended lubricant
Oil seal
Lithium-soap-based grease
Bearing, oil pump drive gear
Engine oil
Oil seal installed depth
0–0.5 mm (0–0.020 in)
a. Oil seal installed depth
Crankshaft installer pot
90890-01274
Installing pot
YU-90058
Crankshaft installer bolt
90890-01275
Bolt
YU-90060
Adapter (M14)
90890-01478
Adapter #6
YM-90066
Spacer (crankshaft installer)
90890-04081
Pot spacer
YM-91044
a
1
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