Page 56 of 92

PERIODIC MAINTENANCE AND ADJUSTMENT
6-13
6
EAUM3031
Engine oil and oil filter ele-
mentThe engine oil level should be checked
before each ride. In addition, the oil
must be changed and the oil filter ele-
ment replaced at the intervals specified
in the periodic maintenance and lubri-
cation chart and when the oil change
indicator comes on.
To check the engine oil level
1. Place the vehicle on the center-
stand. A slight tilt to the side can
result in a false reading.
2. Start the engine, warm it up for
several minutes, and then turn it
off.
3. Wait a few minutes until the oil set-
tles, remove the oil filler cap, wipe
the dipstick clean, insert it back
into the oil filler hole (without
screwing it in), and then remove it
again to check the oil level.TIPThe engine oil should be between the
tip of the dipstick and the maximum
level mark.
4. If the engine oil is not between the
tip of the dipstick and the maxi-
mum level mark, add sufficient oil
of the recommended type to raise
it to the correct level.
5. Insert the dipstick into the oil filler
hole, and then tighten the oil filler
cap.
To change the engine oil (with or
without oil filter element replace-
ment)
1. Place the vehicle on the center-
stand.2. Start the engine, warm it up for
several minutes, and then turn it
off.
3. Place an oil pan under the engine
to collect the used oil.
4. Remove the engine oil filler cap,
the engine oil drain bolt and its
gasket to drain the oil from the
crankcase.
TIPSkip steps 5…7 if the oil filter element is
not being replaced.5. Remove the oil filter element cover
by removing the bolts. NOTICE:
When removing the oil filter ele-
ment cover, the compression
1. Engine oil filler cap
2. Dipstick
3. Maximum level mark
4. Tip of the engine oil dipstickZAUM102834
1
2
1. Engine oil drain bolt
2. Gasket
12
U1SDE1E0.book Page 13 Monday, September 23, 2013 3:55 PM
Page 68 of 92

PERIODIC MAINTENANCE AND ADJUSTMENT
6-25
6Rear brake
WARNING
EWA16011
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
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 or dust
does not enter the brake fluid
reservoir when refilling. Water
will significantly lower the boil-
ing point of the fluid and may re-
sult in vapor lock, an
d dirt may
clog the ABS hydraulic unit
valves.
NOTICE
ECA17641
Brake fluid may damage painted
surfaces or plastic parts. Always
clean up 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
system leakage; therefore, be sure to
check the brake pads for wear and the
brake system for leakage. If the brakefluid level goes down suddenly, have a
Yamaha dealer check the cause before
further riding.
1. Minimum level markSpecified brake fluid:
DOT 4ZAUM1032
1
U1SDE1E0.book Page 25 Monday, September 23, 2013 3:55 PM
Page 85 of 92

SPECIFICATIONS
8-1
8
Dimensions:Overall length:
2190 mm (86.2 in)
Overall width:
780 mm (30.7 in)
Overall height:
1385 mm (54.5 in)
Seat height:
785 mm (30.9 in)
Wheelbase:
1565 mm (61.6 in)
Ground clearance:
103 mm (4.06 in)
Minimum turning radius:
2500 mm (98.4 in)Weight:Curb weight:
YP400R 211 kg (465 lb)
YP400RA 215 kg (474 lb)Engine:Engine type:
Liquid cooled 4-stroke, DOHC
Cylinder arrangement:
Single cylinder
Displacement:
395 cm³
Bore × stroke:
83.0 × 73.0 mm (3.27 × 2.87 in)
Compression ratio:
10.60 : 1
Starting system:
Electric starter
Lubrication system:
Wet 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
standard MA
Engine oil quantity:
Without oil filter element replacement:
1.50 L (1.59 US qt, 1.32 Imp.qt)
With oil filter element replacement:
1.70 L (1.80 US qt, 1.50 Imp.qt)Final transmission oil:Type:
YAMALUBE 10W-40 or SAE 10W-30 type
SE motor oil
Quantity:
0.25 L (0.26 US qt, 0.22 Imp.qt)
Cooling system:Coolant reservoir capacity (up to the
maximum level mark):
0.31 L (0.33 US qt, 0.27 Imp.qt)
Radiator capacity (including all routes):
1.38 L (1.46 US qt, 1.21 Imp.qt)Air filter:Air filter element:
Oil-coated paper elementFuel:Recommended fuel:
Premium unleaded gasoline (Gasohol (E10)
acceptable)
Fuel tank capacity:
14.0 L (3.70 US gal, 3.08 Imp.gal)
Fuel reserve amount:
2.0 L (0.53 US gal, 0.44 Imp.gal)Fuel injection:Throttle body:
ID mark:
5RUG 20Spark plug(s):Manufacturer/model:
NGK/CR7E
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)Clutch:Clutch type:
Dry, centrifugal automaticTransmission:Primary reduction ratio:
1.000
Final drive:
Gear
–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
U1SDE1E0.book Page 1 Monday, September 23, 2013 3:55 PM
Page 86 of 92

SPECIFICATIONS
8-2
8
Secondary reduction ratio:
6.643 (31/14 x 42/14)
Transmission type:
V-belt automatic
Operation:
Centrifugal automatic typeChassis:Frame type:
Underbone
Caster angle:
28.00 °
Trail:
100 mm (3.9 in)Front tire:Type:
Tubeless
Size:
120/70-15 M/C 56S
Manufacturer/model:
MICHELIN/CITY GRIP
Manufacturer/model:
SAVA/DIAMONDS MC28Rear tire:Type:
Tubeless
Size:
150/70-13 M/C 64S
Manufacturer/model:
MICHELIN/CITY GRIP
Manufacturer/model:
SAVA/DIAMONDS MC28
Loading:Maximum load:
YP400R 185 kg (408 lb)
YP400RA 181 kg (399 lb)
(Total weight of rider, passenger, cargo
and accessories)Tire air pressure (measured on cold
tires):Loading condition:
0–90 kg (0–198 lb)
Front:
220 kPa (2.20 kgf/cm², 32 psi)
Rear:
250 kPa (2.50 kgf/cm², 36 psi)
Loading condition:
YP400R 90–185 kg (198–408 lb)
YP400RA 90–181 kg (198–399 lb)
Front:
220 kPa (2.20 kgf/cm², 32 psi)
Rear:
250 kPa (2.50 kgf/cm², 36 psi)Front wheel:Wheel type:
Cast wheel
Rim size:
15 x MT3.50Rear wheel:Wheel type:
Cast wheel
Rim size:
13 x MT4.00Front brake:Type:
Dual disc brakeOperation:
Right hand operation
Specified brake fluid:
DOT 4
Rear brake:Type:
Single disc brake
Operation:
Left hand operation
Specified brake fluid:
DOT 4Front suspension:Type:
Telescopic fork
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
110.0 mm (4.33 in)Rear suspension:Type:
Unit swing
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
92.0 mm (3.62 in)Electrical system:Ignition system:
TCI
Charging system:
AC magnetoBattery:Model:
GT9B-4
U1SDE1E0.book Page 2 Monday, September 23, 2013 3:55 PM