2014 YAMAHA SR400 Owners Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
6-14
1
2
3
4
567
8
9
10
11
12
EAU59632
TiresTires are the only contact between the
vehicle and the road. Safety in all con-
ditions of riding depends on a relatively
small area of road contact. Therefore, it
is essential to maintain the tires in good
condition at all times and replace them
at the appropriate time with the speci-
fied tires.
Tire air pressure
The tire air pressure should be checked
and, if necessary, adjusted before each
ride.
WARNING
EWA10504
Operation of this vehicle with im-
proper tire pressure may cause se-
vere injury or death from loss of
control.
The tire air pressure must be
checked and adjusted on cold
tires (i.e., when the temperature
of the tires equals the ambient
temperature).

The tire air pressure must be ad-
justed in accordance with the
riding speed and with the total weight of rider, passenger, car-
go, and accessories approved
for this model.WARNING
EWA10512
Never overload your vehicle. Opera-
tion of an overloaded vehicle couldcause an accident.
Tire inspection
The tires must be checked before each
ride. If the center tread depth reaches
the specified limit, if the tire has a nail or
glass fragments in it, or if the sidewall is
cracked, have a Yamaha dealer re-
place the tire immediately.
TIPThe tire tread depth limits may differ
from country to country. Always complywith the local regulations.
Tire air pressure (measured on cold
tires):
Up to 90 kg (198 lbs) load:Front: 175 kPa (1.75 kgf/cm
2, 25 psi)
Rear: 200 kPa (2.00 kgf/cm2, 29 psi)
90 kg (198 lbs) to maximum load:
Front: 200 kPa (2.00 kgf/cm2, 29 psi)
Rear:
225 kPa (2.25 kgf/cm2, 33 psi)
Maximum load*: 150 kg (331 lb)
* Total weight of rider, passenger, car- go and accessories
1. Tire sidewall
2. Tire tread depthMinimum tire tread depth (front and
rear): 1.6 mm (0.06 in)
2RD-9-E0.book 14 ページ ２０１３年１１月２８日　木曜日　午後４時１８分

PERIODIC MAINTENANCE AND ADJUSTMENT
6-15
1
2
3
4
56
7
8
9
10
11
12 Tire information
This motorcycle is equipped with tube
tires.
Tires age, even if they have not been
used or have only been used occasion-
ally. Cracking of the tread and sidewall
rubber, sometimes accompanied by
carcass deformation, is an evidence of
ageing. Old and aged tires shall be
checked by tire specialists to ascertain
their suitability for further use.
WARNING
EWA10462
The front and rear tires should be of
the same make and design, other-
wise the handling characteristics of
the vehicle may be different, whichcould lead to an accident.
After extensive tests, only the tires list-
ed below have been approved for this
model by Yamaha Motor Co., Ltd.
WARNING
EWA10572

Have a Yamaha dealer replace
excessively worn tires. Besides
being illegal, operating the mo-
torcycle with excessively worn
tires decreases riding stability
and can lead to loss of control.

The replacement of all wheel-
and brake-related parts, includ-
ing the tires, should be left to a
Yamaha dealer, who has the
necessary professional knowl-
edge and experience.

It is not recommended to patch
a punctured tube. If unavoid-
able, however, patch the tube
very carefully and replace it as
soon as possible with a high-quality product.

Ride at moderate speeds after
changing a tire since the tire
surface must first be “broken
in” for it to develop its optimalcharacteristics.
Front tire:
Size:90/100-18M/C 54S
Manufacturer/model:
METZELER/ME77 Front
Rear tire: Size:
110/90-18M/C 61S
Manufacturer/model: METZELER/ME77
2RD-9-E0.book 15 ページ ２０１３年１１月２８日　木曜日　午後４時１８分

PERIODIC MAINTENANCE AND ADJUSTMENT
6-16
1
2
3
4
567
8
9
10
11
12
EAU21944
Spoke wheels
WARNING
EWA10611
The wheels on this model are not de-
signed for use with tubeless tires.
Do not attempt to use tubeless tireson this model.
To maximize the performance, durabil-
ity, and safe operation of your motorcy-
cle, note the following points regarding
the specified wheels.
The wheel rims should be checked
for cracks, bends, warpage or oth-
er damage, and the spokes for
looseness or damage before each
ride. If any damage is found, have
a Yamaha dealer replace the
wheel. Do not attempt even the
smallest repair to the wheel. A de-
formed or cracked wheel must be
replaced.

The wheel should be balanced
whenever either the tire or wheel
has been changed or replaced. An
unbalanced wheel can result in
poor performance, adverse han-
dling characteristics, and a short- ened tire life.
EAU48291
Adjusting the cl
utch lever free
playThe clutch lever free play should mea-
sure 5.0–10.0 mm (0.20–0.39 in) as
shown. Periodically check the clutch le-
ver free play and, if necessary, adjust it
as follows.
1. Slide the rubber cover back at the clutch lever.
2. Loosen the locknut.
3. To increase the clutch lever free play, turn the adjusting bolt in di-
rection (a). To decrease the clutch1. Clutch lever free play
2. Rubber cover
3. Locknut (clutch lever)
4. Clutch lever free play adjusting bolt
32
4(a)
(b)
1
2RD-9-E0.book 16 ページ ２０１３年１１月２８日　木曜日　午後４時１８分

PERIODIC MAINTENANCE AND ADJUSTMENT
6-17
1
2
3
4
56
7
8
9
10
11
12 lever free play, turn the adjusting
bolt in direction (b).
4. Tighten the locknut and then slide the rubber cover to its original po-
sition.
TIPIf the specified free play cannot be ob-
tained as described above or if the
clutch does not operate correctly, have
a Yamaha dealer check the internalclutch mechanism.
EAU48443
Adjusting the brake lever free
playThe brake lever free play should mea-
sure 5.0–8.0 mm (0.20–0.31 in) as
shown. Periodically check the brake le-
ver free play and, if necessary, adjust it
as follows.
1. Slide the rubber cover back at the brake lever.
2. Loosen the locknut.
3. To increase the brake lever free play, turn the brake lever free play
adjusting screw in direction (a). To decrease the brake lever free play,
turn the adjusting screw in direc-
tion (b).
4. Tighten the locknut, and then slide the rubber cover back to its original
position.
WARNING
EWA10631

After adjusting the brake lever
free play, check the free play
and make sure that the brake is
working properly.

A soft or spongy feeling in the
brake lever can indicate the
presence of air in the hydraulic
system. If there is air in the hy-
draulic system, have a Yamaha
dealer bleed the system before
operating the motorcycle. Air in
the hydraulic system will dimin-
ish the braking performance,
which may result in loss of con-trol and an accident.
1. Locknut
2. Brake lever free play adjusting screw
3. Rubber cover
4. Brake lever free play
2 3
1
(a)
(b)
4
2RD-9-E0.book 17 ページ ２０１３年１１月２８日　木曜日　午後４時１８分

PERIODIC MAINTENANCE AND ADJUSTMENT
6-18
1
2
3
4
567
8
9
10
11
12
EAU60900
Adjusting the brake pedal
height and free play
WARNING
EWA10671
It is advisable to have a Yamahadealer make these adjustments.
Brake pedal height
The top of the brake pedal should be
positioned approximately 20.0 mm
(0.79 in) below the top of the footrest.
Periodically check the brake pedal
height and, if necessary, adjust it as fol-
lows. 1. Loosen the locknut at the frame.
2. To raise the brake pedal, turn the brake pedal height adjusting bolt in
direction (a). To lower the brake
pedal, turn the adjusting bolt in di-
rection (b).
3. Tighten the locknut.
WARNING
EWA11232
After adjusting the brake pedal
height, the brake pedal free playmust be adjusted. Brake pedal free play
The brake pedal free play should mea-
sure 20.0–30.0 mm (0.79–1.18 in) as
shown. Periodically check the brake
pedal free play and, if necessary, adjust
it as follows.
To increase the brake pedal free play,
turn the brake pedal free play adjusting
nut at the brake rod in direction (a). To
decrease the brake pedal free play,
turn the adjusting nut in direction (b).
1. Brake pedal height
1
1. Locknut
2. Brake pedal height adjusting bolt
1
2
(b)
(a)
1. Brake pedal free play
1
2RD-9-E0.book 18 ページ ２０１３年１１月２８日　木曜日　午後４時１８分

PERIODIC MAINTENANCE AND ADJUSTMENT
6-19
1
2
3
4
56
7
8
9
10
11
12
WARNING
EWA10681

After adjusting the drive chain
slack or removing and installing
the rear wheel, always check the
brake pedal free play.

If proper adjustment cannot be
obtained as described, have a
Yamaha dealer make this ad-
justment.

After adjusting the brake pedal
free play, check the operation ofthe brake light.
EAU44821
Checking the shift pedalThe operation of the shift pedal should
be checked before each ride. If opera-
tion is not smooth, have a Yamaha
dealer check the vehicle.
EAU22274
Brake light switchesThe brake light, which is activated by
the brake pedal and brake lever, should
come on just before braking takes ef-
fect. If necessary, adjust the rear brake
light switch as follows, but the front
brake light switch should be adjusted
by a Yamaha dealer.
Turn the rear brake light switch adjust-
ing nut while holding the rear brake light
switch in place. To make the brake light
come on earlier, turn the adjusting nut
in direction (a). To make the brake light
come on later, turn the adjusting nut in
direction (b).
1. Brake pedal free play adjusting nut
(b)
(a)
1
1. Rear brake light switch adjusting nut
2. Rear brake light switch
2
1 (a)
(b)
2RD-9-E0.book 19 ページ ２０１３年１１月２８日　木曜日　午後４時１８分

PERIODIC MAINTENANCE AND ADJUSTMENT
6-20
1
2
3
4
567
8
9
10
11
12
EAU22382
Checking the front brake pads
and rear brake shoes The front brake pads and the rear brake
shoes must be checked for wear at the
intervals specified in the periodic main-
tenance and lubrication chart.
EAU22432
Front brake pads
Each front brake pad is provided with
wear indicator grooves, which allow
you to check the brake pad wear with-
out having to disassemble the brake.
To check the brake pad wear, check
the wear indicator grooves. If a brake
pad has worn to the point that the wear indicator grooves have almost disap-
peared, have a Yamaha dealer replace
the brake pads as a set.
EAU22541
Rear brake shoes
The rear brake is provided with a wear
indicator, which allows you to check the
brake shoe wear without having to dis-
assemble the brake. To check the
brake shoe wear, check the position of
the wear indicator while applying the
brake. If a brake shoe has worn to the
point that the wear indicator reaches
the wear limit line, have a Yamaha
dealer replace the brake shoes as a
set.
EAU32346
Checking the brake fluid levelBefore riding, check that the brake fluid
is above the minimum level mark.
Check the brake fluid level with the top
of the reservoir level. Replenish the
brake fluid if necessary.
WARNING
EWA15991
Improper maintenance can result in
loss of braking ability. Observe
these precautions:
Insufficient brake fluid may al-
low air to enter the brake sys-
tem, reducing braking
1. Brake pad
2. Brake pad wear indicator groove1
2
1. Brake shoe wear indicator
2. Brake shoe wear limit line
12
1. Minimum level markSpecified brake fluid:
DOT 41
2RD-9-E0.book 20 ページ ２０１３年１１月２８日　木曜日　午後４時１８分

PERIODIC MAINTENANCE AND ADJUSTMENT
6-21
1
2
3
4
56
7
8
9
10
11
12 performance.

Clean the filler cap before re-
moving. Use only DOT 4 brake
fluid from a sealed container.

Use only the specified brake flu-
id; otherwise, the rubber seals
may deteriorate, causing leak-
age.

Refill with the same type of
brake fluid. Adding a brake fluid
other than DOT 4 may result in a
harmful chemical reaction.

Be careful that water does not
enter the brake fluid reservoir
when refilling. Water will signifi-
cantly lower the boiling point of
the fluid and may result in vaporlock.
NOTICE
ECA17641
Brake fluid may damage painted sur-
faces or plastic parts. Always cleanup spilled fluid immediately.
As the brake pads wear, it is normal for
the brake fluid level to gradually go
down. A low brake fluid level may indi-
cate worn brake pads and/or brake sys-
tem leakage; therefore, be sure to check the brake pads for wear and the
brake system for leakage. If the brake
fluid level goes down suddenly, have a
Yamaha dealer check the cause before
further riding.
EAU22724
Changing the brake fluid Have a Yamaha dealer change the
brake fluid at the intervals specified in
the periodic maintenance and lubrica-
tion chart. In addition, have the oil seals
of the brake master cylinder and caliper
as well as the brake hose replaced at
the intervals listed below or whenever
they are damaged or leaking.
Oil seals: Replace every two
years.

Brake hose: Replace every four
years.
2RD-9-E0.book 21 ページ ２０１３年１１月２８日　木曜日　午後４時１８分