Yamaha Fz1n Service Manual

FEATURES
1-2
EAS20170
FEATURES
OUTLINE OF THE FI SYSTEM
The main function of a fuel supply system is to provide fuel to the combustion chamber at the opti-
mum air-fuel ratio in accordance with the engine operating conditions and the atmospheric tempera-
ture. In the conventional carburetor system, the air-fuel ratio of the mixture that is supplied to the 
combustion chamber is created by the volume of the intake air and the fuel that is metered by the jet 
used in the respective carburetor.
Despite the...

FI SYSTEM
1-3
ET2D1001
FI SYSTEM
The fuel pump delivers fuel to the fuel injector via the fuel filter. The pressure regulator maintains the 
fuel pressure that is applied to the fuel injector at only 324 kPa (3.24 kg/cm
2, 46.1 psi). Accordingly, 
when the energizing signal from the ECU energize s the fuel injector, the fuel passage opens, caus-
ing the fuel to be injected into the intake manifo ld only during the time the passage remain open. 
Therefore, the longer the length of time the fuel injector...

INSTRUMENT FUNCTIONS
1-4
ET2D1002
INSTRUMENT FUNCTIONS
Multi-function meter unit
WARNING
EW2D1005
Be sure to stop the vehicle before making 
any setting changes to the multi-function 
meter unit.
The multi-function meter unit is equipped with 
the following:
 a speedometer (which shows the riding speed)
 a tachometer (which shows engine speed)
 an odometer (which shows the total distance  traveled)
 two tripmeters (which show the distance trav-
eled since they were last set to zero)
 a fuel reserve...

INSTRUMENT FUNCTIONS
1-5
3. When the hour digits start flashing, push the “RESET” button to set the hours.
4. Push the “SELECT” button, and the minute  digits will start flashing.
5. Push the “RESET” button to set the min-
utes.
6. Push the “SELECT” button and then  release it to start the clock.
Odometer and tripmeter modes
Push the “SELECT” button to switch the dis-
play between the odometer mode “ODO” and 
the tripmeter modes “TRIP A” and “TRIP B” in 
the following order:
TRIP A  → TRIP B  → ODO  →...

INSTRUMENT FUNCTIONS
1-6
Air intake temperature mode
The air intake temperature display indicates 
the temperature of the air drawn into the air fil-
ter case. Push the “RESET” button to switch 
the coolant temperature display to the air 
intake temperature display.
NOTE:
 Even if the air intake temperature is set to be displayed, the coolant temperature warning 
light comes on when the engine overheats.
 When the key is turned to “ON”, the coolant  temperature is automatically displayed, even 
if the...

INSTRUMENT FUNCTIONS
1-7
1. Turn the key to “OFF”.
2. Push and hold the “SELECT” button.
3. Turn the key to “ON”, and then release the “SELECT” button after five seconds.
4. Push the “RESET” button to select the 
desired brightness level.
5. Push the “SELECT” button to confirm the  selected brightness level. The display will 
return to the odometer or tripmeter mode. 

IMPORTANT INFORMATION
1-8
EAS20180
IMPORTANT INFORMATION
EAS20190
PREPARATION FOR REMOVAL AND DISAS-
SEMBLY
1. Before removal and disassembly, remove all dirt, mud, dust and foreign material.
2. Use only the proper tools and cleaning  equipment.
Refer to SPECIAL TOOLS on page 1-11.
3. When disassembling, always keep mated  parts together. This includes gears, cylin-
ders, pistons and other parts that have 
been “mated” through normal wear. Mated 
parts must always be reused or replaced 
as an assembly....

IMPORTANT INFORMATION
1-9
EAS20230
BEARINGS AND OIL SEALS
Install bearings “1” and oil seals “2” so that the 
manufacturer’s marks or numbers are visible. 
When installing oil seals, lubricate the oil seal 
lips with a light coat of lithium-soap-based 
grease. Oil bearings liberally when installing, if 
appropriate.
CAUTION:
ECA13300
Do not spin the bearing with compressed 
air because this will damage the bearing 
surfaces.
EAS20240
CIRCLIPS
Before reassembly, check all circlips carefully 
and replace...

CHECKING THE CONNECTIONS
1-10
EAS20250
CHECKING THE CONNECTIONS
Check the leads, couplers, and connectors for 
stains, rust, moisture, etc.
1. Disconnect: Lead
 Coupler
 Connector
2. Check:
 Lead
 Coupler
 ConnectorMoisture  → Dry with an air blower.
Rust/stains  → Connect and disconnect 
several times.
3. Check:  All connections
Loose connection  → Connect properly.
NOTE:
If the pin “1” on the terminal is flattened, bend 
it up.
4. Connect:
 Lead
 Coupler
 Connector
NOTE:
Make sure all...

SPECIAL TOOLS
1-11
EAS20260
SPECIAL TOOLS
The following special tools are necessary for complete and accurate tune-up and assembly. Use 
only the appropriate special tools as this will help prevent damage caused by the use of inappropri-
ate tools or improvised techniques. Special tools, part numbers or both may differ depending on the 
country.
When placing an order, refer to the list provided below to avoid any mistakes.
NOTE:
 For U.S.A. and Canada, use part number starting with “YM-”, “YU-”, or...