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ENGINE
• Clean and assemble the head and valve components. Fill the
intake and exhaust ports with gasoline to check for leaks.
• If any leaks occur, inspect the valve seat and face for burrs or
other things that could prevent the valve from sealing.
A WARNING
Always
use extreme
caution
when
handling
gasoline.
VALVE STEM END CONDITION
• Check the valve stem end face for pitting and wear.
VALVE SPRING
The force of the coil springs keeps the valve seat tight. Weak-
ened springs result 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 spring.
_ Valve
spring
free length (IN & EX):
Service limit: 37.0 mm (1.46 in)
,got!
09900-20102: Vernier calipers
_ Valve
spring
tension:
Standard: (IN & EX):
127
-147
N, 13.0
-15.0
kgf/32.85 mm
(28.7 - 33.1 Ibsl1.28 in)
13.0 - 15.0 kgf
o