KYMCO Mongoose 50-4T

7. CYLINDER HEAD/VALVES
(90cc/70cc/50cc-4T)
7-7
CAMSHAFT HOLDER INSPECTION
Inspect the camshaft holder for wear or
damage.
Inspect the rocker arm shaft for blue
discoloration or grooves.
If any defects are found, replace the rocker
arm shaft with a new one, then inspect
lubrication system.
Inspect the rocker arm bore, cam lobe
contact surface and adjuster surface for
wear/pitting/scratches/blue discoloration.
If any defects are found, replace the rocker
arm shaft with a new one, then inspect
lubrication system.
Measure each rocker arm shaft O.D.
Measure the I.D. of each valve rocker arm.
Measure arm to shaft clearance.
Replace as a set if out of specification.
Service limits: 0.1 mm (0.004 in)
Camshaft Holde
r
Rocker Arm Shafts
Rocker Arm Bore
Contact Surface Adjuster Surface
Rocker Ar
m
Rocker Ar
m