Yamaha FJR1300N 2001 Service Manual page 508

FUEL INJECTION SYSTEM
h. Use the vacuum pressure pump gauge set
to adjust the fuel pressure in relation to the
vacuum pressure as described below.
NOTE:
The vacuum pressure should not exceed
100 kPa (1 mmHg).
Increase the vacuum pressure →
Fuel pressure is decreased
Decrease the vacuum pressure →
Fuel pressure is increased
Faulty → Replace the pressure regulator.
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