ENGINE 3-19
VALVE SPRING
The force of the coil spring keeps the valve seat tight. Weak-
ened spring results in reduced engine power output, and often
account for the chattering noise coming from the valve mecha-
nism.
• Check the valve springs for proper strength by measuring
their free length and also by the force required to compress
them.
• If the spring length is less than the service limit, or if the force
required to compress the spring does not fall within the range
specified, replace the valve spring.
Valve spring free length (IN & EX):
Service Limit: 22.8 mm (0.90 in)
Valve spring tension (IN & EX):
36.5 – 41.9 N (3.7 – 4.3 kgf, 8.2 – 9.5 lbs)
at length 15.0 mm (0.59 in)
09900-20102: Vernier calipers
REASSEMBLY
Reassemble the cylinder head in the reverse order of disassem-
bly. Pay attention to the following points:
• Apply MOLYBDENUM OIL SOLUTION to the new stem seal.
• Press-fit the stem seal onto the intake valve guide.
MOLYBDENUM OIL SOLUTION
• Insert the valves, with their stems coated with MOLYBDE-
NUM OIL SOLUTION all around and along the full stem
length without any break.
MOLYBDENUM OIL SOLUTION
15.0 mm
The removed valve stem seal must be replaced with a
new one.
When inserting intake valve, take care not to damage
the lip of the stem seal.
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