Suzuki GN125F, Service Manual

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E N G I N E
3-14
CYLINDER HEAD ASSEMBLY
Gasoline is very explosive, be sure to keep the work
area well ventilated. Keep away from fire and spark.
Clean and assemble cylinder head and valve components.
Fill intake and exhaust ports with gasoline to check for
leaks and worn seals.
If any leaks occur, check the valve seat and face for burrs or
other defects that could prevent the valve from fully seating.
Clean the cylinder head thoroughly with a cleaning
liquid and blow all passages with compressed air.
99000-25140: MOLY PASTE
M
NOTE:
When a valve spring is mounted, the seal ring side should face
the combustion chamber. In order to avoid oil seal damage,
the valve oil seal should be mounted while the valve is rotating
slowly.
Reassemble the cylinder head in the reverse order of
removal, pay attention to the following points:
Oil each seal, and drive them into the position.
Always use new oil seal.
Lubricate all valves with Moly Paste.
Insert the valves into valve guide pipes.
Install the valve spring washer, inner spring, outer spring
and retainer.
Install valve springs making sure that the close-
pitch end of each spring goes in first to rest on the head.
,
Cylinder
head
Close-pitch
Large-pitch
Large-pitch
Close-pitch