Suzuki GN125F, Service Manual

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E N G I N E
3-8
Take off the valve cotters from the valve stem.
Take out the valve spring retainers inner springs and
outer springs.
Pull out the valves from the other side.
,
Remove the oil seal.
Remove the spring lower retainer
.
After removed the sealant from the fitting surface of the
cylinder head cover, place the cylinder head cover on a plain
plate and check for distortion with a thickness gauge. Check
points are shown in Fig. If the distortion exceeds the limit,
replace the cylinder head cover.
Measure the diameter of rocker arm shaft.
11F14 018: Valve spring tools -
Removed oil seal should be replaced with a new one.
INSPECTION
CYLINDER HEAD COVER
09900 20803 Thickness gauge - :
ROCKER ARM SHAFT
09900-20205 : Micrometer (0-25 mm)
Cylinder head distortion limit: 0.05 mm
Rocker arm shaft O.D. (IN and EX): 11.977-11.995 mm