Yamaha Fz1n Service Manual

ENGINE
3-16
4. Install: Air filter case cover
CAUTION:
ECA14400
Never operate the engine without the air fil-
ter element installed. Unfiltered air will 
cause rapid wear of engine parts and may 
damage the engine. Operating the engine 
without the air filter element will also affect 
throttle bodies synchronization, leading to 
poor engine performance and possible 
overheating.
NOTE:
When installing the air filter element into the air 
filter case cover, make sure that the sealing 
surfaces are...

ENGINE
3-17
Refer to FUEL TANK on page 7-1.
2. Check:
 Crankcase breather hose “1”Cracks/damage  → Replace.
Loose connection  → Connect properly.
CAUTION:
ECA13450
Make sure the crankcase breather hose is 
routed correctly.
3. Install:
 Fuel tankRefer to FUEL TANK on page 7-1.
 Rider and passenger seat
Refer to GENERAL CHASSIS on page 4-
1.
CAUTION:
ECS2D003
To install the fuel tank, check that the 
breather hose is not folded or pinched by 
the fuel tank.
EAS21080
CHECKING THE EXHAUST SYSTEM
The...

ENGINE
3-18
2. Check: EXUP system operation
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a. Activate the diagnostic mode and select  the diagnostic code number “53”.
Refer to FUEL INJECTION SYSTEM on 
page 8-31.
b. Set the engine stop switch to “ ”.
c. Check that the EXUP valve operates prop- erly.
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3. Check:
 EXUP cable free play (at the EXUP valve pulley) “a” and “b”
4. Adjust:  EXUP cable free play
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a. Turn the main switch to “ON”
b. Check the EXUP...

ENGINE
3-19
 Coolant levelThe coolant level should be between the 
maximum level mark “a” and minimum level 
mark “b”.
Below the minimum level mark  → Add the 
recommended coolant to the proper level.
CAUTION:
ECA13470
 Adding water instead of coolant lowers  the antifreeze content of the coolant. If 
water is used instead of coolant check, 
and if necessary, correct the antifreeze 
concentration of the coolant.
 Use only distilled water. However, if dis-
tilled water is not available, soft water...

ENGINE
3-20
4. Drain: Coolant(from the coolant reservoir)
5. Remove:
 Radiator cap “1”
WARNING
EWA13030
A hot radiator is under pressure. Therefore, 
do not remove the radiator cap when the 
engine is hot. Scalding hot fluid and steam 
may be blown out, which could cause seri-
ous injury. When the engine has cooled, 
open the radiator cap as follows:
Place a thick rag or a towel over the radia-
tor cap and slowly turn the radiator cap 
counterclockwise toward the detent to 
allow any residual pressure...

ENGINE
3-21
Coolant is potentially harmful and should 
be handled with special care.
WARNING
EWA13040
 If coolant splashes in your eyes, thor-oughly wash them with water and consult 
a doctor.
 If coolant splashes on your clothes, 
quickly wash it away with water and then 
with soap and water.
 If coolant is swallowed, induce vomiting 
and get immediate medical attention.
CAUTION:
ECA13480
 Adding water instead of coolant lowers 
the antifreeze content of the coolant. If 
water is used instead of...

CHASSIS
3-22
EAS21140
CHASSIS
EAS21160
ADJUSTING THE FRONT DISC BRAKE
1. Adjust: Brake lever position(distance “a” from the throttle grip to the 
brake lever)
NOTE:
 While pushing the brake lever forward, turn 
the adjusting dial “1” until the brake lever is in 
the desired position.
 Be sure to align the setting on the adjusting  dial with the arrow mark “2” on the brake 
lever holder.
WARNING
EWA13060
 After adjusting the brake lever position, make sure the pin on the brake lever 
holder is firmly...

CHASSIS
3-23
EAS21240
CHECKING THE BRAKE FLUID LEVEL
1. Stand the vehicle on a level surface.
NOTE:
 Place the vehicle on a suitable stand.
 Make sure the vehicle is upright.
2. Check: Brake fluid levelBelow the minimum level mark “a”  → Add 
the recommended brake fluid to the proper 
level.
WARNING
EWA13090
 Use only the designated brake fluid. 
Other brake fluids may cause the rubber 
seals to deteriorate, causing leakage and 
poor brake performance.
 Refill with the same type of brake fluid...

CHASSIS
3-24
EAS21280
CHECKING THE FRONT BRAKE HOSES
The following procedure applies to all of the 
brake hoses and brake hose clamps.
1. Check:Brake hose “1”Cracks/damage/wear  → Replace.
2. Check:  Brake hose clamp “2”
Loose  → Tighten the clamp bolt.
3. Hold the vehicle upright and apply the front  brake several times.
4. Check: Brake hoseBrake fluid leakage  → Replace the dam-
aged hose.
Refer to FRONT BRAKE on page 4-20.
EAS21290
CHECKING THE REAR BRAKE HOSE
1. Check: Brake hose...

CHASSIS
3-25
nut “2” in direction “a” or “b” until the rear 
brake light comes on at the proper time.
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EAS21350
BLEEDING THE HYDRAULIC BRAKE SYS-
TEM
WARNING
EWA13100
Bleed the hydraulic brake system when-
ever:
 The system is disassembled.
 A brake hose is loosened, disconnected or replaced.
 The brake fluid level is very low.
 Brake operation is faulty.
NOTE:
 Be careful not to spill any brake fluid or allow  the brake master cylinder reservoir or brake 
fluid...