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Yamaha F75F - Checking the Fuel Rail and Fuel Injector; Installing the Fuel Injector; Removing the Fuel Injector

Yamaha F75F
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Fuel injector
6-18
Removing the fuel injector
Cover the fuel components using a rag to pre-
vent fuel from spilling out.
1. Reduce:
Fuel pressure
See “Reducing the fuel pressure” (6-1).
2. Disconnect:
Quick connector
See “Disconnecting the quick connector”
(6-1).
Checking the fuel rail and fuel injector
1. Check:
Fuel rail
Cracked/deformed Replace.
2. Measure:
Fuel volume
injected by the injector
See the “Fuel Injection Meter Operation
Manual” (90894-62982-85).
Do not use gasoline when measuring the
fuel injection volume. Otherwise, the cylin
-
der could be damaged, which can cause a
gasoline leakage. Make sure
to follow the
instructions for operation of the fuel injec-
tion meter.
When measuring, obtain a result from the av-
erage of 4 measurements.
It is not
possible to obtain correct measure-
ments under disparate test conditions.
Make sure to fully charge the batter
y.
The cylin
der is graduated in increments of
2.5 cm³ (2.5 cc).
Make sure to co
mply with the laws and regu-
lations of the region when disposing of the
used test fuel.
Installing the fuel injector
1. Install:
O-ring
Fuel injector
Holder
Fuel rail
Fuel rail
bolt
Fuel injection meter
FIM20000ME
Fuel injection volume
90 cm³ (90 cc)/30 sec
Test fuel
Dry sorbent (viscosity: 1.2 ± 0.03
mm²/s, specific gravity: 0.774 [1
5
C])
Test fuel temperature
22–24 C
(room temperature and
test fuel temperature should be
the same)
Test fuel pressure
300 ± 1.5 kPa
Measuring cylinder internal pres-
sure (standard atmosphere pres-
sure)
960–1060 hPa
New

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