2014 YAMAHA SR400 transmission

OPERATION AND IMPORTANT RIDING POINTS
5-3
1
2
3
45
6
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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 theshock of forced shifting.
EAU16811
Tips for reducing fuel
consumptionFuel 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-inThere 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
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PERIODIC MAINTENANCE AND ADJUSTMENT
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2
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567
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EAU22762
Drive chain slackThe drive chain slack should be
checked before each ride and adjusted
if necessary.
EAU59591
To check the drive chain slack 1. Place the motorcycle on the cen- terstand.
2. Shift the transmission into the neu- tral position.
3. Push on the drive chain at the cen- ter point between the drive axle
and the rear wheel axle with a
force of 50 N (5.0 kgf, 11 lbf).
4. Measure drive chain slack as shown. 5. If the drive chain slack is incorrect,
adjust it as follows.
EAU59641
To adjust the drive chain slack
Consult a Yamaha dealer before ad-
justing the drive chain slack.1. Take the motorcycle off the center- stand, and then put the sidestand
down.
2. Loosen the brake pedal free play adjusting nut, brake torque rod nut,
and axle nut. 3. Loosen the drive chain puller lock-
nut at each end of the swingarm.
4. Place the motorcycle on the cen- terstand.
5. To tighten the drive chain, turn the drive chain slack adjusting bolt at
each end of the swingarm in direc-
tion (a). To loosen the drive chain,
turn the adjusting bolt at each end
of the swingarm in direction (b),
and then push the rear wheel for-
ward. NOTICE: Improper drive
chain slack will overload the en-
Drive chain slack: 30.0–40.0 mm (1.18–1.57 in)
1. Drive chain slack
1
1. Brake pedal free play adjusting nut
2. Drive chain slack adjusting bolt
3. Drive chain puller locknut
4. Axle nut
5. Brake torque rod nut
6. Brake torque rod
6
12
3
4
5
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8-1
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SPECIFICATIONS
EAU5091H
Dimensions:Overall length: 2085 mm (82.1 in)
Overall width: 750 mm (29.5 in)
Overall height: 1095 mm (43.1 in)
Seat height:
785 mm (30.9 in)
Wheelbase: 1410 mm (55.5 in)
Ground clearance: 130 mm (5.1 in)
Minimum turning radius:
2400 mm (94.5 in)Weight:Curb weight:174 kg (384 lb)Engine:Engine type:Air cooled 4-stroke, SOHC
Cylinder arrangement: Single cylinder
Displacement:
399 cm
3
Bore  stroke:
87.0  67.2 mm (3.43  2.65 in)
Compression ratio: 8.50 : 1
Starting system:
Kickstarter
Lubrication system: Dry sump
Engine oil:Recommended brand:
YAMALUBE
Type: SAE 10W-30, 10W-40, 10W-50, 15W-40,
20W-40 or 20W-50
Recommended engine oil grade: API service SG type or higher, JASO stan-
dard MA
Engine oil quantity: Without oil filter element replacement:
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)Air filter:Air filter element:
Oil-coated paper elementFuel:Recommended fuel:Regular unleaded gasoline (Gasohol (E10)
acceptable) Fuel tank capacity:
12.0 L (3.17 US gal, 2.64 Imp.gal)
Fuel reserve amount:
2.2 L (0.58 US gal, 0.48 Imp.gal)
Fuel injection:Throttle body:ID mark: 2RD1 00Spark plug(s):Manufacturer/model:
NGK/BPR6ES
Spark plug gap: 0.7–0.8 mm (0.028–0.031 in)
Clutch type: Wet, multiple-discTransmission:Primary reduction ratio:2.567 (77/30)
Final drive: Chain
Secondary reduction ratio:
2.947 (56/19)
Transmission type: Constant mesh 5-speed
Operation: Left foot operation
Gear ratio:
1st: 2.357 (33/14)
2nd:
1.556 (28/18)
3rd: 1.190 (25/21)
–20 –10 0 1020 30 40 50 C
10 30 50 70 90 110
0 130 F
SAE 10W-30
SAE 15W-40SAE 20W-40SAE 20W-50
SAE 10W-40SAE 10W-50
2RD-9-E0.book 1 ページ ２０１３年１１月２８日　木曜日　午後４時１８分