Checking The Injector Pressure; Checking The Fuel Pressure - Yamaha TMAX 2020 Service Manual

4. Check the injector pressure after the injectors
are installed.
Refer to "CHECKING THE INJECTOR
PRESSURE" on page 7-12.
EAS30481

CHECKING THE INJECTOR PRESSURE

TIP
• After installing the injectors, perform the follow-
ing steps to check the injector pressure.
• Do not allow any foreign materials to enter the
fuel lines.
1. Check:
• Injector pressure
a. Connect the fuel injector pressure adapter
"1" to the fuel rail joint "2", and then connect
an air compressor "3" to the adapter.
b. Connect the pressure gauge "4" to the fuel
injector pressure adapter "1".
Pressure gauge
90890-03153
Pressure gauge
YU-03153
Fuel injector pressure adapter
90890-03210
Fuel injector pressure adapter
YU-03210
G089041
c. Close the valve on the fuel injector pressure
adapter.
d. Apply air pressure with the air compressor.
e. Open the valve on the fuel injector pressure
adapter until the specified pressure is
reached.
Specified air pressure
490 kPa (5.0 kgf/cm², 71.1 psi)
ECA17600
NOTICE
Never exceed the specified air pressure or
damage could occur.
f. Close the valve on the fuel injector pressure
adapter.
g. Check that the specified air pressure is held
at least one minute.
Pressure drops  Check the pressure
gauge and adapter.
Check the seals and O-rings and then rein-
stall.
Out of specification  Replace the fuel in-
jectors.
EAS30482

CHECKING THE FUEL PRESSURE

1. Check:
• Fuel pressure
a. Remove the bottom side cowling, side pan-
el and bottom center cowling.
Refer to "GENERAL CHASSIS (1)" on
page 4-1.
b. Remove the center cover, fuel tank cover
assembly, side cover, rear side cowling as-
sembly and footboard.
Refer to "GENERAL CHASSIS (2)" on
page 4-11.
c. Remove the fuel tank bolt and hold up the
fuel tank.
d. Disconnect the fuel hose "1" from the fuel
pump.
Refer to "REMOVING THE FUEL TANK"
on page 7-3.
EWA17320
WARNING
Cover fuel hose connections with a cloth
when disconnecting them. Residual pres-
sure in the fuel lines could cause fuel to
spurt out when removing the hose.
ECA17490
NOTICE
Be sure to disconnect the fuel hose by hand.
Do not forcefully disconnect the hose with
tools.
e. Connect the pressure gauge "2" and fuel
pressure adapter "3" to the fuel hose.
7-12
THROTTLE BODY
1