Upper End Components Inspection And Servicing - HYOSUNG RX 125 Service Manual

3-11 ENGINE
UPPER END COMPONENTS
INSPECTION AND SERVICING
CAMSHAFT HOLDER DISTORTION
After removing the oil from the fitting surface of the
camshaft holder, place the camshaft holder on a
surface plate and check for distortion with a thick-
ness gauge. Check points are shown in Fig.
Camshaft holder distortion
● If the distortion exceeds the service limit, replace
the camshaft holder.
ROCKER ARM SHAFT O.D.
Measure the diameter of rocker arm shaft.
Rocker arm shaft O.D.
ROCKER ARM I.D.
When checking the valve rocker arm, the inside
diameter of the valve rocker arm and wear of the
camshaft contacting surface should be checked.
Rocker arm I.D.
Dial caliper : 09900-20605
CAMSHAFT
The camshaft should be checked for runout and
also for wear of cams and journals if the engine
has been noted to produce abnormal noise or
vibration or a lack of output power. Any of these
abnormality could be caused by a worn camshaft.
Service limit 0.05 mm
Standard 11.977~11.995mm
Standard 12.000~12.018mm
(T.D.C)
Intake open
(B.T.D.C)
44。 37。
65。
52。
Intake close
(A.B.D.C)
(B.D.C)
Valve timing diagram
Exhaust close
(A.T.D.C)
Exhaust open
(B.B.D.C)