2014 YAMAHA SR400 maintenance

PERIODIC MAINTENANCE AND ADJUSTMENT
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12 9. Install the oil filter element cover by
installing the bolts.
10. Install the oil filter element drain bolt.
11. Tighten the oil filter element cover bolts and the oil filter element drain
bolt to their specified torques.
12. Tighten the oil filter element cover bleed bolt to the specified torque. 13. Install the engine oil drain bolts
and their new gasket, and then
tighten the bolts to the specified
torques.
14. Add the specified amount of the recommended engine oil, and then
install and tighten the oil filler cap.
TIPBe sure to wipe off spilled oil on any
parts after the engine and exhaust sys-
tem have cooled down.NOTICE
ECA11621

In order to prevent clutch slip-
page (since the engine oil also
lubricates the clutch), do not
mix any chemical additives. Do
not use oils with a diesel speci-
fication of “CD” or oils of a high-
er quality than specified. In
addition, do not use oils labeled
“ENERGY CONSERVING II” or
higher.

Make sure that no foreign mate-rial enters the crankcase.
15. Start the engine, and then let it idle for several minutes while checking
it for oil leakage. If oil is leaking, im-
mediately turn the engine off and
check for the cause.
16. Turn the engine off, and then check the oil level and correct it if
necessary.
NOTICE
ECA11232
After changing the engine oil, make
sure to check the oil pressure as de-
scribed below.
1. Oil filter element cover
2. O-ring
3. Oil filter elementTightening torques:Oil filter element cover bolt:10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Oil filter element drain bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
2
1
3
Tightening torque:Oil filter element cover bleed bolt:5 Nm (0.5 m·kgf, 3.6 ft·lbf)
Tightening torques: Engine oil drain bolt (crankcase):30 Nm (3.0 m·kgf, 22 ft·lbf)
Engine oil drain bolt (oil tank):
16 Nm (1.6 m·kgf, 12 ft·lbf)
Recommended engine oil: See page 8-1.
Oil quantity:
Without oil filter element replace-
ment:2.00 L (2.11 US qt, 1.76 Imp.qt)
With oil filter element replacement: 2.10 L (2.22 US qt, 1.85 Imp.qt)
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PERIODIC MAINTENANCE AND ADJUSTMENT
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
Loosen the bleed bolt.

Start the engine and keep it
idling until oil flows out. If no oil
comes out after one minute,
turn the engine off immediately
so it will not seize. If this occurs,
have a Yamaha dealer repair the
vehicle.

After checking the oil pressure,
tighten the bleed bolt to thespecified torque.
EAU52031
Replacing the air filter elementThe air filter element should be re-
placed at the intervals specified in the
periodic maintenance and lubrication
chart. Replace the air filter element
more frequently if you are riding in un-
usually wet or dusty areas.
To replace the air filter element 1. Remove panel A. (See page 6-7.)
2. Remove the air filter case cover by removing the screws.
3. Pull the air filter element out. 4. Insert a new air filter element into
the air filter case. NOTICE: Make
sure that the air filter element is
properly seated in the air filter
case. The engine should never
be operated without the air filter
element installed, otherwise the
piston(s) and/or cylinder(s) may
become excessively worn.
[ECA10482]
5. Install the air filter case cover by in- stalling the screws.
6. Install the panel.
1. Bleed boltTightening torque: Bleed bolt: 18 Nm (1.8 m·kgf, 13 ft·lbf)
1
1. Screw
2. Air filter case cover
1
2
1
1. Air filter element
1
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PERIODIC MAINTENANCE AND ADJUSTMENT
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EAU44735
Checking the engine idling
speedCheck the engine idling speed and, if
necessary, have it corrected by a
Yamaha dealer.
EAU21385
Checking the thrott le grip free
playThe throttle grip free play should mea-
sure 3.0–5.0 mm (0.12–0.20 in) at the
inner edge of the throttle grip. Periodi-
cally check the throttle grip free play
and, if necessary, have a Yamaha
dealer adjust it.
EAU21402
Valve clearanceThe valve clearance changes with use,
resulting in improper air-fuel mixture
and/or engine noise. To prevent this
from occurring, the valve clearance
must be adjusted by a Yamaha dealer
at the intervals specified in the periodic
maintenance and lubrication chart.
Engine idling speed: 1200–1400 r/min
1. Throttle grip free play
1
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PERIODIC MAINTENANCE AND ADJUSTMENT
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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)
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PERIODIC MAINTENANCE AND ADJUSTMENT
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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
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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
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-17
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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
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PERIODIC MAINTENANCE AND ADJUSTMENT
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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
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