Yamaha LIT-11616-16-02 Model Vehicle User Manual


 
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ENG
CAMSHAFT, ROCKER ARMS AND VALVES
2.Check:
Rocker arms
Rocker arm shafts
Damage/wear Replace.
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Checking steps:
Check the two contact areas on the rocker
arms for signs of abnormal wear.
1) Rocker arm shaft hole
2) Camshaft lobe contact surface
Excessive wear Replace.
Check the surface of the rocker arm shafts.
Blue discoloration/pitting/scratches
Replace/check lubrication.
Measure the inside diameter a of the rocker
arm holes.
Out of specification Replace.
Measure the outside diameter b of the
rocker arm shafts.
Out of specification Replace.
Calculate the clearance by subtracting the
rocker arm shaft outside diameter from the
rocker arm inside diameter.
Clearance greater than 0.08 mm (0.003 in)
Replace the defective part(s).
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Rocker arm inside diameter:
12.000 ~ 12.018 mm
(0.4724 ~ 0.4731 in)
Rocker arm outside diameter:
11.981 ~ 11.991 mm
(0.4717 ~ 0.4721 in)
Rocker arm to shaft standard
clearance:
0.009 ~ 0.037 mm
(0.0004 ~ 0.0015 in)