Yamaha Fz1n Service Manual

THERMOSTAT
6-9
Below the specified pressure → Replace 
the radiator cap.
Refer to CHECKING THE RADIATOR on 
page 6-3. 

WATER PUMP
6-10
EAS26500
WAT E R  P U M P
Removing the impeller shaft
Order Job/Parts to remove Q’ty RemarksOil/water pump assembly Refer to OIL PUMP on page 5-58.
Oil pump roter Refer to OIL PUMP on page 5-58.
1 Water pump cover 1
2O-ring 1
3Pin 2
4 Impeller shaft (along with the impeller) 1
5 Water pump seal 1
6 Oil seal 1
7 Bearing 1
8O-ring 1 For installation, reverse the removal 
procedure. 

WATER PUMP
6-11
EAS26520
DISASSEMBLING THE WATER PUMP
1. Remove: Water pump seal “1”
 Water pump housing “2”
NOTE:
Tap out the water pump seal from the inside of 
the water pump housing.
2. Remove: Oil seal “1”
 Bearing “2”
 Water pump housing “3”
NOTE:
Tap out the bearing and oil seal from the out-
side of the water pump housing.
3. Remove:
 Rubber damper holder “1”
 Rubber damper “2”(from the impeller, with a thin, flat-head 
screwdriver)
NOTE:
Do not scratch the impeller shaft.
EAS26540...

WATER PUMP
6-12
2. Install: Water pump seal “1”  
CAUTION:
ECA14080
Never lubricate the water pump seal sur-
face with oil or grease.
NOTE:
 Install the water pump  seal with the special 
tools.
 Before installing the water pump seal, apply  Yamaha bond No.1215 (Three Bond 
No.1215® ) “2” to the water pump housing 
“3”.
3. Install:  Rubber damper holder “1” 
 Rubber damper “2” 
NOTE:
Before installing the rubber damper, apply tap 
water or coolant onto its outer surface.
4. Measure: Impeller shaft...

WATER PUMP
6-13 

7
FUEL SYSTEM
FUEL TANK.................................................................................................. 7-1
REMOVING THE FUEL TANK ................................................................ 7-2
REMOVING THE FUEL PUMP............................................................... 7-2
CHECKING THE FUEL PUMP BODY .................................................... 7-2
CHECKING THE FUEL PUMP OPERATION ......................................... 7-2
INSTALLING THE FUEL PUMP...

FUEL TANK
7-1
EAS26620
FUEL TANK
Removing the fuel tank
Order Job/Parts to remove Q’ty RemarksRider and passenger seat Refer to GENERAL CHASSIS on  page 4-1.
1 Fuel hose 1 Disconnect.
2 Fuel sender coupler 1 Disconnect.
3 Fuel pump coupler 1 Disconnect.
4 Fuel tank drain hose 1 Disconnect.
5 Fuel tank breather hose 1 Disconnect.
6 Fuel tank 1
7 Fuel tank cover 1
8 Fuel pump 1 For installation, reverse the removal 
procedure. 

FUEL TANK
7-2
EAS26630
REMOVING THE FUEL TANK
1. Extract the fuel in the fuel tank through the fuel tank cap with a pump.
2. Remove:  Fuel hose connector cover
 Fuel hose
 Fuel sender coupler
 Fuel pump coupler
 Fuel tank breather hose
 Fuel tank drain hose
CAUTION:
EC2D1009
 Be sure to disconnect the fuel hose by hand. Do not forcefully disconnect the 
hose with tools.
 Although the fuel has been removed from  the fuel tank be careful when removing 
the fuel hoses, since there may be fuel...

FUEL TANK
7-3
ET2D1023
INSTALLING THE FUEL TANK
1. Install: Fuel hose
 Fuel hose connector cover
CAUTION:
ECA14740
When installing the fuel hose, make sure 
that it is securely connected, and that the 
fuel hose holders are in the correct posi-
tion, otherwise the fuel hose will not be 
properly installed.
NOTE:
Install the fuel hose connector securely onto 
the fuel tank until a distinct “click” is heard, and 
then make sure that it does not come loose.
To install the fuel hose from the fuel...

THROTTLE BODIES
7-4
EAS26970
THROTTLE BODIES
Removing the throttle bodies
Order Job/Parts to remove Q’ty RemarksRider and passenger seat Refer to GENERAL CHASSIS on  page 4-1.
Fuel tank Refer to FUEL TANK on page 7-1.
Air filter case Refer to GENERAL CHASSIS on  page 4-1.
1 Sub-wire harness coupler 2 Disconnect.
2 Coolant temperature sensor coupler 1 Disconnect.
3 Thermo wax inret hose 1 Disconnect.
4 Thermo wax outlet hose 1 Disconnect.
5 Idle adjust screw wire 1
6 Throttle body joint clamp 4 Loosen.
7...