POWER UNIT 6-25
VALVE SPRING
Valve spring free length
Measure the spring free length.
$ 09900-20102: Vernier calipers
Standard : 49.3 mm (1.94 in)
Service limit: 48.1 mm (1.89 in)
If the measurement is the lower than the service limit, replace
the valve spring.
Valve spring tension
Measure the valve spring tension.
$ 09900-20102: Vernier caliper
Standard:
24.8 – 29.2 kg (54.7 – 64.3 lbs) for 41.5 mm (1.63 in)
Service limit: 22.8 kg (50.2 lbs) for 41.5 mm (1.63 in)
If the measurement is the lower than the service limit, replace
the valve spring.
Valve spring sequareness
Measure the valve spring sequareness A.
$ 09900-20102: Vernier calipers
Sequare plate
Service limit: 2.0 mm (0.08 in)
If the measurement exceeds the service limit, replace the valve
spring.
NOTE:
Clean and assemble the cylinder head and the valve compo-
nents. Fill the intake and the exhaust ports with solvent to check
for leaks between the valve seat and the valve. If any leaks oc-
cur, inspect the valve seat and the face for burrs or other things
that could prevent the valve from sealing.
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