CAMSHAFT (YP250R)
5-75
3. Check:
• Camshaft oil passage
Obstruction → Blow out with compressed air.
EAS23880
CHECKING THE ROCKER ARMS AND
ROCKER ARM SHAFTS
The following procedure applies to all of the
rocker arms and rocker arm shafts.
1. Check:
• Rocker arm
Damage/wear → Replace.
2. Check:
• Rocker arm shaft
Blue discoloration/excessive wear/pit-
ting/scratches → Replace or check the lubri-
cation system.
3. Measure:
• Rocker arm inside diameter “a”
Out of specification → Replace.
4. Measure:
• Rocker arm shaft outside diameter “a”
Out of specification → Replace.
5. Calculate:
• Rocker-arm-to-rocker-arm-shaft clearance
IP
Calculate the clearance by subtracting the rock-
er arm shaft outside diameter from the rocker
arm inside diameter.
Out of specification → Replace the defective
part(s).
EAS24040
INSTALLING THE CAMSHAFT AND ROCKER
ARMS
1. Lubricate:
• Camshaft
2. Lubricate:
• Rocker arms
• Rocker arm shafts
Rocker arm inside diameter
12.000–12.018 mm (0.4724–
0.4731 in)
Limit
12.030 mm (0.4736 in)
Rocker arm shaft outside diame-
ter
11.981–11.991 mm (0.4717–
0.4721 in)
Limit
11.950 mm (0.4705 in)
Rocker-arm-to-rocker-arm-shaft
clearance
0.009–0.037 mm (0.0004–0.0015
in)
Limit
0.080 mm (0.0031 in)
Recommended lubricant
Camshaft
Molybdenum disulfide grease
Camshaft bearing
Engine oil
Recommended lubricant
Rocker arm inner surface
Molybdenum disulfide grease
Rocker arm shaft
Engine oil
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