2016 YAMAHA SR400 engine

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

Operation and important riding points
5-2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
EAU59532
Starting the engine
In order for the ignition circuit cut-off
system (page 3-15) to enable starting,
one of the following conditions must be
met:
The transmission is in the neutral
position.
The transmission is in gear with
the clutch lever pulled and the sid-
estand up.
1. Turn the fuel cock lever to “ON”.
2. Turn the key to “ON” and set the engine stop switch to “ ”.
The engine trouble warning light
and fuel level warning light should
come on for a few seconds, then
go off.
NOTICE
ECA23270
If a warning light does not come on
initially when the key is turned to
“ON”, or if a warning light remains
on, see page 3-2 for the correspond-
ing warning light circuit check.
3. Shift the transmission into the neu- tral position. The neutral indicator
light should come on. If not, ask a
Yamaha dealer to check the elec-
trical circuit.
4. Completely close the throttle and apply the decompression lever.
5. Slowly push the kickstarter lever down until the starting mark shows
on the kick indicator. 6. Release the decompression lever,
release the kickstarter lever, and
then push the kickstarter lever
down forcefully to start the engine.
NOTICE
ECA11043
For maximum engine life, never ac-
celerate hard when the engine is
cold!
1. Starting mark
2. Kick indicator
21
2RD-28199-E1.book 2 ページ ２０１５年９月３日　木曜日　午後３時４２分

Operation and important riding points
5-3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
EAU59470
Starting trouble
If the engine fails to start after 4 to 5
kicks, clear out the combustion cham-
ber with the following procedure. 1. Turn the key to “OFF”.
2. While applying the decompression lever, fully open the throttle grip
and push the kickstarter lever
down 4 to 5 times.
3. Turn the key to “ON” and retry starting the engine.
EAU16673
Shifting
Shifting gears lets you control the
amount of engine power available for
starting off, accelerating, climbing hills,
etc.
The gear positions are shown in the il-
lustration.
TIP
To shift the transmission into the neu-
tral position, press the shift pedal down
repeatedly until it reaches the end of its
travel, and then slightly raise it.
NOTICE
ECA10261
Even with the transmission in
the neutral position, do not
coast for long periods of time
with the engine off, and do not
tow the motorcycle for long dis-
tances. The transmission is
properly lubricated only when
the engine is running. Inade-
quate lubrication may damage
the transmission.
Always use the clutch while
changing gears to avoid damag-
ing the engine, transmission,
and drive train, which are not
designed to withstand the
1. Shift pedal
2. Neutral position
1
2
1 3 4 5
N
2
2RD-28199-E1.book 3 ページ ２０１５年９月３日　木曜日　午後３時４２分

Operation and important riding points
5-4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
shock of forced shifting.
EAU16682To start out and accelerate 1. Pull the clutch lever to disengage the clutch.
2. Shift the transmission into first gear. The neutral indicator light
should go out.
3. Open the throttle gradually, and at the same time, release the clutch
lever slowly.
4. At the recommended shift points shown in the following table, close
the throttle, and at the same time,
quickly pull the clutch lever in.
5. Shift the transmission into second gear. (Make sure not to shift the
transmission into the neutral posi-
tion.)
6. Open the throttle part way and gradually release the clutch lever.
7. Follow the same procedure when shifting to the next higher gear.
TIP
When shifting gears in normal operat-
ing conditions, use the recommended
shift points.
EAU16701To decelerate1. Apply both the front and the rear brakes to slow the motorcycle.
2. Shift the transmission into first gear when the motorcycle reaches
20 km/h (12 mph). If the engine is
about to stall or runs very roughly,
pull the clutch lever in and use the
brakes to stop the motorcycle.
3. Shift the transmission into the neu- tral position when the motorcycle
is almost completely stopped. The neutral indicator light should come
on.
EAU64120Recommended shift points
The recommended shift points during
acceleration and deceleration are
shown in the table below.
Shift up points:
1st  2nd: 20 km/h (12 mph)
2nd  3rd: 30 km/h (19 mph)
3rd  4th: 40 km/h (25 mph)
4th  5th: 50 km/h (31 mph)
Shift down points: 5th  4th: 35 km/h (22 mph)
4th  3rd: 25 km/h (16 mph)
3rd  2nd: 20 km/h (12 mph)
2nd  1st: 20 km/h (12 mph)
2RD-28199-E1.book 4 ページ ２０１５年９月３日　木曜日　午後３時４２分

Operation and important riding points
5-5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
EAU16811
Tips for reducing fuel
consumption
Fuel consumption depends largely on
your riding style. Consider the following
tips to reduce fuel consumption:
Shift up swiftly, and avoid high en-
gine speeds during acceleration.
Do not rev the engine while shifting
down, and avoid high engine
speeds with no load on the engine.
Turn the engine off instead of let-
ting it idle for an extended length of
time (e.g., in traffic jams, at traffic
lights or at railroad crossings).
EAU16842
Engine break-in
There is never a more important period
in the life of your engine than the period
between 0 and 1600 km (1000 mi). For
this reason, you should read the follow-
ing material carefully.
Since the engine is brand new, do not
put an excessive load on it for the first
1600 km (1000 mi). The various parts in
the engine wear and polish themselves
to the correct operating clearances.
During this period, prolonged full-throt-
tle operation or any condition that might
result in engine overheating must be
avoided.
EAU17094
0–1000 km (0–600 mi)
Avoid prolonged operation above 3500
r/min. NOTICE: After 1000 km (600
mi) of operation, the engine oil must
be changed and the oil filter car-
tridge or element replaced.
[ECA10303]
1000–1600 km (600–1000 mi)
Avoid prolonged operation above 4200
r/min.
1600 km (1000 mi) and beyond
The vehicle can now be operated nor-
mally.
NOTICE
ECA10311
Keep the engine speed out of
the tachometer red zone.
If any engine trouble should oc-
cur during the engine break-in
period, immediately have a
Yamaha dealer check the vehi-
cle.
2RD-28199-E1.book 5 ページ ２０１５年９月３日　木曜日　午後３時４２分

Operation and important riding points
5-6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
EAU17214
Parking
When parking, stop the engine, and
then remove the key from the main
switch.
WARNING
EWA10312
Since the engine and exhaust
system can become very hot,
park in a place where pedestri-
ans or children are not likely to
touch them and be burned.
Do not park on a slope or on soft
ground, otherwise the vehicle
may overturn, increasing the
risk of a fuel leak and fire.
Do not park near grass or other
flammable materials which
might catch fire.
2RD-28199-E1.book 6 ページ ２０１５年９月３日　木曜日　午後３時４２分

6-1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Periodic maintenance and adjustment
EAU17246
Periodic inspection, adjustment, and lu-
brication will keep your vehicle in the
safest and most efficient condition pos-
sible. Safety is an obl igation of the vehi-
cle owner/operator. The most important
points of vehicle inspection, adjust-
ment, and lubrication are explained on
the following pages.
The intervals given in the periodic
maintenance charts should be simply
considered as a general guide under
normal riding conditions. However, de-
pending on the weather, terrain, geo-
graphical location, and individual use,
the maintenance intervals may need to
be shortened.
WARNING
EWA10322
Failure to properly maintain the ve-
hicle or performing maintenance ac-
tivities incorrectly may increase
your risk of injury or death during
service or while using the vehicle. If
you are not familiar with vehicle ser-
vice, have a Yamaha dealer perform
service.
WARNING
EWA15123
Turn off the engine when performing
maintenance unless otherwise
specified.
A running engine has moving
parts that can catch on body
parts or clothing and electrical
parts that can cause shocks or
fires.
Running the engine while ser-
vicing can lead to eye injury,
burns, fire, or carbon monoxide
poisoning – possibly leading to death. See page 1-2 for more in-
formation about carbon monox-
ide.
WARNING
EWA15461
Brake discs, calipers, drums, and
linings can become very hot during
use. To avoid possible burns, let
brake components cool before
touching them.
2RD-28199-E1.book 1 ページ ２０１５年９月３日　木曜日　午後３時４２分

Periodic maintenance and adjustment
6-2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
EAU17303
Emission controls not only function to
ensure cleaner air, but are also vital to
proper engine operation and maximum
performance. In the following periodic
maintenance charts, the services relat-
ed to emissions control are grouped
separately. These services require
specialized data, knowledge, and
equipment. Maintenance, replacement,
or repair of the emission control devic-
es and systems may be performed by
any repair establishment or individual
that is certified (if applicable). Yamaha
dealers are trained and equipped to
perform these particular services.
EAU59370
Owner’s tool kit
The owner’s tool kit is located inside the
tool box.
To access the owner’s tool kit, slide the
lock cover open, insert the key into the
lock, and then turn it 1/4 turn clockwise.
The service information included in this
manual and the tools provided in the
owner’s tool kit are intended to assist
you in the performance of preventive
maintenance and minor repairs. How-
ever, additional tools such as a torque
wrench may be necessary to perform
certain maintenance work correctly.
TIP
If you do not have the tools or experi-
ence required for a particular job, have
a Yamaha dealer perform it for you.
1. Unlock.
2. Lock cover
1. Owner’s tool kit
1 2
1
2RD-28199-E1.book 2 ページ ２０１５年９月３日　木曜日　午後３時４２分