Page 4 of 96
Important manual information
EAU63350
Particularly important information is distinguished in this manual by the following
notations:
*Product and specifications are subject to change without notice.
EAU10201
This is the safety alert symbol. It is used to
alert you to potential personal injury hazards.
Obey all safety messages that follow this
symbol to avoid possible injury or death.
A WARNING indicates a hazardous situation
which, if not avoided, could result in death or
serious injury.
A NOTICE indicates special precautions that
must be taken to avoid damage to the vehicle
or other property.
A TIP provides key information to make proce-
dures easier or clearer.
SR400
OWNER’S MANUAL
©2015 by Yamaha Motor Co., Ltd. 1st edition, August 2015All rights reserved.
Any reprinting or unauthorized use without the written permission of Yamaha Motor Co., Ltd.
is expressly prohibited. Printed in Japan.
WARNING
NOTICE
TIP
2RD-28199-E1.book 1 ページ 2015年9月3日 木曜日 午後3時42分
Page 15 of 96

3-1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Instrument and control functions
EAU10462
Main switch/steering lock
The main switch/steering lock controls
the ignition and lighting systems, and is
used to lock the steering. The various
positions are described below.
EAU45111ON
All electrical circuits are supplied with
power, and the meter lighting and tail-
light come on, and the engine can be
started. The key cannot be removed.
TIP
The headlight comes on automatically
when the engine is started and stays on
until the key is turned to “OFF”, even if
the engine stalls.
EAU10662OFF
All electrical systems are off. The key
can be removed.
WARNING
EWA10062
Never turn the key to “OFF” or
“LOCK” while the vehicle is moving.
Otherwise the electrical systems will
be switched off, which may result in
loss of control or an accident.
EAU10687LOCK
The steering is locked and all electrical
systems are off. The key can be re-
moved.
To lock the steering
1. Turn the handlebars all the way to the left.
2. With the key in the “OFF” position, push the key in and turn it to
“LOCK”.
3. Remove the key.
TIP
If the steering will not lock, try turning
the handlebars back to the right slightly.
To unlock the steering
P
ON
OFF
LOCK
1. Push.
2. Turn.
1. Push.
2. Turn.
12
12
2RD-28199-E1.book 1 ページ 2015年9月3日 木曜日 午後3時42分
Page 16 of 96

Instrument and control functions
3-2
1
2
3
4
5
6
7
8
9
10
11
12
13
14 1. Insert the key.
2. With the key in the “LOCK” posi-
tion, push the key in and turn it to
“OFF”.
EAU59680 (Parking)
The hazard lights and turn signal lights
can be turned on, but all other electrical
systems are off. The key can be re-
moved.
The steering must be locked before the
key can be turned to “ ”.
NOTICE
ECA20760
Using the hazard or turn signal
lights for an extended length of time
may cause the battery to discharge.
EAU49398
Indicator light s and warning
lights
EAU11022Turn signal indicator light “ ”
This indicator light flashes when a turn
signal light is flashing.
EAU11061Neutral indicator light “ ”
This indicator light comes on when the
transmission is in the neutral position.
EAU11081High beam indicator light “ ”
This indicator light comes on when the
high beam of the headlight is switched
on.
EAU11354Fuel level warning light “ ”
This warning light comes on when the
fuel level drops below approximately
2.2 L (0.58 US gal, 0.48 Imp.gal). When
this occurs, refuel as soon as possible.
The electrical circuit of the warning light
can be checked by turning the key to
“ON”. The warning light should come
on for a few seconds, and then go off.
1. Engine trouble warning light “ ”
2. Fuel level warning light “ ”
3. Neutral indicator light “ ”
4. High beam indicator light “ ”
5. Turn signal indicator light “ ”
4
2
153
2RD-28199-E1.book 2 ページ 2015年9月3日 木曜日 午後3時42分
Page 17 of 96

Instrument and control functions
3-3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
If the warning light does not come on
initially when the key is turned to “ON”,
or if the warning light remains on, have
a Yamaha dealer check the electrical
circuit.
EAU11486Engine trouble warning light “ ”
This warning light comes on if a prob-
lem is detected in the electrical circuit
monitoring the engine. If this occurs,
have a Yamaha dealer check the vehi-
cle.
The electrical circuit of the warning light
can be checked by turning the key to
“ON”. The warning light should come
on for a few seconds, and then go off.
If the warning light does not come on
initially when the key is turned to “ON”,
or if the warning light remains on, have
a Yamaha dealer check the electrical
circuit.
EAU11631
Speedometer unit
The speedometer unit is equipped with
a speedometer, an odometer and a
tripmeter. The speedometer shows rid-
ing speed. The odometer shows the to-
tal distance traveled. The tripmeter
shows the distance traveled since it
was last set to zero with the reset knob.
The tripmeter can be used to estimate
the distance that can be traveled with a
full tank of fuel. This information will en-
able you to plan future fuel stops.
1. Reset knob
2. Speedometer
3. Odometer
4. Tripmeter
123 4
2RD-28199-E1.book 3 ページ 2015年9月3日 木曜日 午後3時42分
Page 19 of 96

Instrument and control functions
3-5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
EAU12352Pass switch “ ”
Press this switch to flash the headlight.
TIP
When the dimmer switch is set to “ ”,
the passing switch has no effect.
EAU12401Dimmer switch “ / ”
Set this switch to “ ” for the high
beam and to “ ” for the low beam.
EAU12461Turn signal switch “ / ”
To signal a right-hand turn, push this
switch to “ ”. To signal a left-hand
turn, push this switch to “ ”. When re-
leased, the switch returns to the center
position. To cancel the turn signal
lights, push the switch in after it has re-
turned to the center position.
EAU12501Horn switch “ ”
Press this switch to sound the horn.
EAU12661Engine stop switch “ / ”
Set this switch to “ ” before starting
the engine. Set this switch to “ ” to
stop the engine in case of an emergen-
cy, such as when the vehicle overturns
or when the throttle cable is stuck.
EAU12735Hazard switch “ ”
With the key in the “ON” or “ ” posi-
tion, use this switch to turn on the haz-
ard lights (simultaneous flashing of all
turn signal lights).
The hazard lights are used in case of
an emergency or to warn other drivers
when your vehicle is stopped where it
might be a traffic hazard.
NOTICE
ECA10062
Do not use the hazard lights for an
extended length of time with the en-
gine not running, otherwise the bat-
tery may discharge.
2RD-28199-E1.book 5 ページ 2015年9月3日 木曜日 午後3時42分
Page 22 of 96
Instrument and control functions
3-8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
EAU13125
Fuel tank cap
To remove the fuel tank cap
Slide the fuel tank cap lock cover open,
insert the key into the lock, and then
turn it 1/4 turn clockwise. The lock will
be released and the fuel tank cap can
be removed.
To install the fuel tank cap 1. Insert the fuel tank cap into the tank opening with the key inserted
in the lock and with the “ ” mark
facing forward.
2. Turn the key counterclockwise to the original position, remove it, and
then close the lock cover.
TIP
The fuel tank cap cannot be installed
unless the key is in the lock. In addition,
the key cannot be removed if the cap is
not properly installed and locked.
WARNING
EWA10132
Make sure that the fuel tank cap is
properly installed before riding.
Leaking fuel is a fire hazard.
1. Unlock.
2. Fuel tank cap lock cover
1. “ ” mark
2. Fuel tank cap lock cover
2
1
1
2
2RD-28199-E1.book 8 ページ 2015年9月3日 木曜日 午後3時42分
Page 30 of 96

Instrument and control functions
3-16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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 kick starter lever down.
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 kick starter lever down.
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
The vehicle must be placed on the centerstand during this inspection.
If a malfunction is noted, have a Yamaha dealer check the system
before riding.
YES NO
YESNO
YESNO
2RD-28199-E1.book 16 ページ 2015年9月3日 木曜日 午後3時42分
Page 33 of 96
5-1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Operation and important riding points
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.
EAU59360
TIP
This model is equipped with:
a lean angle sensor to stop the en-
gine in case of a turnover. In this
case, turn the key to “OFF” and
then to “ON”. Failing to do so will
prevent the engine from starting
even though the engine will crank
when pushing the kick starter lever
down.
an engine auto-stop system. The
engine stops automatically if left
idling for 20 minutes. If the engine
stops, simply push the kick starter
lever down to restart the engine.
2RD-28199-E1.book 1 ページ 2015年9月3日 木曜日 午後3時42分