Yamaha FZ8NA Service Manual page 363

b. Apply 122.7 kPa (1.23 kgf/cm², 17.8 psi) of
pressure.
c. Measure the indicated pressure with the
gauge.
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3. Measure:
• Radiator cap opening pressure
Below the specified pressure → Replace
the radiator cap.
Refer to "CHECKING THE RADIATOR"
on page 6-3.
6-4
RADIATOR