ENGINE 3-31
VALVE SPRING INSPECTION
The force of the coil spring keeps the valve seat tight. A weak-
ened spring results in reduced engine power output and often
accounts 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 re-
quired to compress the spring does not fall within the specified
range, replace both the inner and outer springs as a set.
# Valve spring free length (IN & EX)
Service Limit: 37.2 mm
! 09900-20102 : Vernier calipers
# Valve spring tension (IN & EX)
Standard: 121 – 139 N (12.1 – 13.9 kgf) at length 33.7 mm
121 – 139 N
33.7 mm
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