Checking The Decompression System; Checking The Rocker Arms And Rocker Arm Shafts - Yamaha YXR70FX Service Manual

ROCKER ARMS AND CAMSHAFT
1
2
3. Measure:
• camshaft runout
Out of specification → Replace.
Camshaft runout limit
0.015 mm (0.0006 in)
EBS00225
CHECKING THE DECOMPRESSION
SYSTEM
1. Check:
• decompression system
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a. Check the decompression system with the
camshaft sprocket installed on the decom-
pressor lever and pin installed in the cam-
shaft.
b. Check that the decompressor lever pin 1
projects from the camshaft.
c. Check that the decompressor cam 2
moves smoothly.
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EBS00239
CHECKING THE ROCKER ARMS AND
ROCKER ARM SHAFTS
The following procedure applies to both of the
rocker arms and rocker arm shafts.
1. Check:
• rocker arm
Damage/wear → Replace.
2. Check:
• rocker arm shaft
Blue discoloration/excessive wear/pitting/
scratches → Replace or check the lubrica-
tion system.
3. Measure:
• rocker arm inside diameter
Out of specification → Replace.
Rocker arm inside diameter
12.000 ~ 12.018 mm
(0.4724 ~ 0.4731 in)
4 - 23
ENG
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L LLL L L LLL L L LLL L LLL