YAMAHA YZF-R125 2019 Owner's Guide

Instrument and control functions
3-17
3 dry, soft cloth, since fuel may
deteriorate painted surfaces or
plastic parts.
[ECA10072]
4. Be sure to securely close the fuel
tank cap.
WARNING
EWA15152
Gasoline is poisonous and can
cause injury or death. Handle gaso-
line with care. Never siphon gasoline
by mouth. If you should swallow
some gasoline or inhale a lot of gas-
oline vapor, or get some gasoline in
your eyes, see your doctor immedi-
ately. If gasoline spills on your skin,
wash with soap and water. If gaso-
line spills on your clothing, change
your clothes.
EAU75320
NOTICE
ECA11401
Use only unleaded gasoline. The use
of leaded gasoline will cause severe
damage to internal engine parts,
such as the valves and piston rings,
as well as to the exhaust system.
TIP
This mark identifies the recom-
mended fuel for this vehicle as
specified by European regulation
(EN228).
Check that gasoline nozzle has
the same identifier when fueling.
Your Yamaha engine has been de-
signed to use premium unleaded gas-
oline with a research octane number of
95 or higher. If knocking (or pinging)
occurs, use a gasoline of a different
brand. Use of unleaded fuel will extend
spark plug life and reduce mainte-
nance costs.
Gasohol
There are two types of gasohol: gaso-
hol containing ethanol and that con-
taining methanol. Gasohol containing
ethanol can be used if the ethanol con-
tent does not exceed 10% (E10). Gas-
ohol containing methanol is not
recommended by Yamaha because it
can cause damage to the fuel system
or vehicle performance problems.
Recommended fuel:
Premium unleaded gasoline (Gaso-
hol [E10] acceptable)
Fuel tank capacity:
11 L (2.9 US gal, 2.4 Imp.gal)
Fuel reserve amount (when the fuel
level warning light comes on):
3.0 L (0.79 US gal, 0.66 Imp.gal)
E5E10
UB5GE0E0.book Page 17 Thursday, August 23, 2018 10:05 AM

Instrument and control functions
3-18
3
EAU58301
Fuel tank overflow hose
Before operating the vehicle:
Check the fuel tank overflow hose
connection and routing.
Check the fuel tank overflow hose
for cracks or damage, and replace
it if necessary.
Make sure that the fuel tank over-
flow hose is not blocked, and
clean it if necessary.
EAU13434
Catalytic converter
This model is equipped with a catalytic
converter in the exhaust system.
WARNING
EWA10863
The exhaust system is hot after op-
eration. To prevent a fire hazard or
burns:
Do not park the vehicle near
possible fire hazards such as
grass or other materials that
easily burn.
Park the vehicle in a place
where pedestrians or children
are not likely to touch the hot
exhaust system.
Make sure that the exhaust sys-
tem has cooled down before
doing any maintenance work.
Do not allow the engine to idle
more than a few minutes. Long
idling can cause a build-up of
heat.
NOTICE
ECA10702
Use only unleaded gasoline. The use
of leaded gasoline will cause unre-
pairable damage to the catalytic
converter.
1. Guide
2. Fuel tank overflow hose
ZAUM160212
UB5GE0E0.book Page 18 Thursday, August 23, 2018 10:05 AM

Instrument and control functions
3-19
3
EAUE3431
Seats
Passenger seat
To remove the passenger seat
1. Remove the plastic cover.
2. Remove the nut and then slide in
forward direction to remove the
passenger seat as shown.
To install the passenger seat
1. Insert the projections on the front
of the passenger seat into the seat
holders as shown, and then place
the seat in the original position.2. Install the passenger seat by in-
stalling and tightening the nut to
the specified torque.
3. Install the plastic cover.
Rider seat
To remove the rider seat
1. Insert the key into the seat lock,
and then turn it clockwise.
2. While holding the key in the posi-
tion “2”, lift from rear of the rider
seat and pull it backward.
1. Plastic cover
1. Nut
1
ZAUE3363
ZAUE3364
1
1. Projection
2. Seat holder
Tightening torque:
Passenger seat nut:
13 N·m (1.3 kgf·m, 9.6 lb·ft)
1. Rider seat lock
2. Unlock.
ZAUE3365
1
2
2
1
ZAUE3366
UB5GE0E0.book Page 19 Thursday, August 23, 2018 10:05 AM

Instrument and control functions
3-20
3To install the rider seat
1. Insert the projection on the front of
the rider seat into the seat holder
as shown, place the seat in the
original position.
2. Remove the key.
TIP
Make sure that the seats are properly
secured before riding.
EAU15306
Sidestand
The sidestand is located on the left
side of the frame. Raise the sidestand
or lower it with your foot while holding
the vehicle upright.
TIP
The built-in sidestand switch is part of
the ignition circuit cut-off system,
which cuts the ignition in certain situa-
tions. (See the following section for an
explanation of the ignition circuit cut-
off system.)
WARNING
EWA10242
The vehicle must not be ridden with
the sidestand down, or if the side-
stand cannot be properly moved up
(or does not stay up), otherwise the
sidestand could contact the ground
and distract the operator, resulting
in a possible loss of control.
Yamaha’s ignition circuit cut-off
system has been designed to assist
the operator in fulfilling the respon-
sibility of raising the sidestand be-
fore starting off. Therefore, check
this system regularly and have a
Yamaha dealer repair it if it does not
function properly.
1. Projection
2. Seat holder
2
1
ZAUE3367
UB5GE0E0.book Page 20 Thursday, August 23, 2018 10:05 AM

Instrument and control functions
3-21
3
EAU66730
Ignition circuit cut-off system
The ignition circuit cut-off system
(comprising the sidestand switch,
clutch switch and neutral switch) has
the following functions.
It prevents starting when the
transmission is in gear and the
sidestand is up, but the clutch le-
ver is not pulled.
It prevents starting when the
transmission is in gear and the
clutch lever is pulled, but the side-
stand is still down.
It cuts the running engine when
the transmission is in gear and the
sidestand is moved down.
Periodically check the operation of the
ignition circuit cut-off system accord-
ing to the following procedure.
UB5GE0E0.book Page 21 Thursday, August 23, 2018 10:05 AM

Instrument and control functions
3-22
3
With the engine turned off:
1. Move the sidestand down.
2.
Make sure that the engine stop switch
is set to “ ”.
3. Turn the key on.
4. Shift the transmission into the neutral
position.
5. Push the start switch.
Does the engine start?
With the engine still running:
6. Move the sidestand up.
7. Keep the clutch lever pulled.
8. Shift the transmission into gear.
9. Move the sidestand down.
Does the engine stall?
After the engine has stalled:
10. Move the sidestand up.
11. Keep the clutch lever pulled.
12. Push the start switch.
Does the engine start?
The system is OK. The motorcycle can
be ridden.
The neutral switch may not be working
correctly.
The motorcycle should not be ridden
until checked by a Yamaha dealer.
The sidestand switch may not be
working correctly.
The motorcycle should not be ridden
until checked by a Yamaha dealer.
The clutch switch may not be working
correctly.
The motorcycle should not be ridden
until checked by a Yamaha dealer.
WARNING
If a malfunction is noted, have a
Yamaha dealer check the system
before riding.
YES NO
YES NO
YES NO
UB5GE0E0.book Page 22 Thursday, August 23, 2018 10:05 AM

For your safety – pre-operation checks
4-1
4
EAU63441
Inspect your vehicle each time you use it to make sure the vehicle is in safe oper-
ating condition. Always follow the inspection and maintenance procedures and
schedules described in the Owner’s Manual.
WARNING
EWA11152
Failure to inspect or maintain the vehicle properly increases the possibility
of an accident or equipment damage. Do not operate the vehicle if you find
any problem. If a problem cannot be corrected by the procedures provided
in this manual, have the vehicle inspected by a Yamaha dealer.
Before using this vehicle, check the following points:
ITEM CHECKS PAGE
Fuel• Check fuel level in fuel tank.
• Refuel if necessary.
• Check fuel line for leakage.
• Check fuel tank overflow hose for obstructions, cracks
or damage, and check hose connection.3-16,
3-18
Engine oil• Check oil level in engine.
• If necessary, add recommended oil to specified level.
• Check vehicle for oil leakage.6-10
Coolant• Check coolant level in reservoir.
• If necessary, add recommended coolant to specified
level.
• Check cooling system for leakage.6-13
Front brake• Check operation.
• If soft or spongy, have Yamaha dealer bleed hydraulic
system.
• Check brake pads for wear.
• Replace if necessary.
• Check fluid level in reservoir.
• If necessary, add specified brake fluid to specified level.
• Check hydraulic system for leakage.6-22,
6-23
Rear brake• Check operation.
• If soft or spongy, have Yamaha dealer bleed hydraulic
system.
• Check brake pads for wear.
• Replace if necessary.
• Check fluid level in reservoir.
• If necessary, add specified brake fluid to specified level.
• Check hydraulic system for leakage.6-22,
6-23
Clutch• Check operation.
• Lubricate cable if necessary.
• Check lever free play.
• Adjust if necessary.6-20
UB5GE0E0.book Page 1 Thursday, August 23, 2018 10:05 AM

For your safety – pre-operation checks
4-2
4
Throttle grip• Make sure that operation is smooth.
• Check throttle grip free play.
• If necessary, have Yamaha dealer adjust throttle grip
free play and lubricate cable and grip housing.6-15,
6-27
Control cables• Make sure that operation is smooth.
• Lubricate if necessary.6-27
Drive chain• Check chain slack.
• Adjust if necessary.
• Check chain condition.
• Lubricate if necessary.6-25,
6-26
Wheels and tires•Check for damage.
• Check tire condition and tread depth.
• Check air pressure.
• Correct if necessary.6-17,
6-19
Brake and shift pedals• Make sure that operation is smooth.
• Lubricate pedal pivoting points if necessary.6-28
Brake and clutch le-
vers• Make sure that operation is smooth.
• Lubricate lever pivoting points if necessary.6-28
Sidestand• Make sure that operation is smooth.
• Lubricate pivot if necessary.6-29
Chassis fasteners• Make sure that all nuts, bolts and screws are properly
tightened.
• Tighten if necessary.—
Instruments, lights,
signals and switches• Check operation.
• Correct if necessary.—
Sidestand switch • Check operation of ignition circuit cut-off system.
• If system is not working correctly, have Yamaha dealer
check vehicle.3-20 ITEM CHECKS PAGE
UB5GE0E0.book Page 2 Thursday, August 23, 2018 10:05 AM

Operation and important riding points
5-1
5
EAU15952
Read the Owner’s Manual carefully to
become familiar with all controls. If
there is a control or function you do not
understand, ask your Yamaha dealer.
WARNING
EWA10272
Failure to familiarize yourself with
the controls can lead to loss of con-
trol, which could cause an accident
or injury.
EAU45311
TIP
This model is equipped with a lean an-
gle sensor to stop the engine in case of
a turnover. To start the engine after a
turnover, be sure to turn the main

ing to do so will prevent the engine
from starting even though the engine
will crank when pushing the start
switch.
UB5GE0E0.book Page 1 Thursday, August 23, 2018 10:05 AM

Operation and important riding points
5-2
5
EAUM4021
Starting the engine
Under normal conditions, shift the
transmission into neutral before start-
ing the engine. To start the engine with
the transmission in gear, the sidestand
must be up and the clutch lever pulled.
To start the engine
1. Set the engine stop switch to the
run position, and turn the main
switch to the on position.
2. Confirm the following lights come
on for a few seconds and then go
off.
Engine trouble warning light
Coolant warning light
Shift timing indicator light
TIP
The ABS warning light should go
off after reaching a speed of 10
km/h (6 mi/h) or higher.
The neutral position indicator light
should be on when the transmis-
sion is in neutral.
NOTICE
ECA24110
If a warning or indicator light does
not work as described above, have a
Yamaha dealer check the vehicle.
3. Shift the transmission into neutral.
4. Push the start switch to crank the
engine with the starter.
Release the start switch when the
engine starts, or after 5 seconds.
Wait 10 seconds before pressing
the switch again to allow battery
voltage to restore.
NOTICE
ECA11043
For maximum engine life, never ac-
celerate hard when the engine is
cold!
UB5GE0E0.book Page 2 Thursday, August 23, 2018 10:05 AM