Page 80 of 92

PERIODIC MAINTENANCE AND ADJUSTMENT
6-37
6Engine overheating
WARNING
EWAT1041
Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be
blown out under pressure, which could cause serious injury. Be sure to wait until the engine has cooled.
Place a thick rag, like a towel, over the radiator cap, and then slowly rotate the cap counterclockwise to the
detent to allow any residual pressure to escape. When the hissing sound has stopped, press down on the cap
while turning it counterclockwise, and then remove the cap.TIPIf coolant is not available, tap water can be temporarily used instead, provided that it is changed to the recommended cool-
ant as soon as possible.
Wait until the
engine has cooled.
Check the coolant level in the
reservoir and radiator.
The coolant level
is OK.The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer checkand repair the cooling system.Add coolant. (See TIP.)
Start the engine. If the engine overheats again,
have a
Yamaha dealer check
and repair the cooling system.
There is
leakage.
There is
no leakage.
U1SDE1E0.book Page 37 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 89 of 92

10-1
10
INDEX
AABS (for ABS models) .......................... 3-12
ABS warning light (for ABS models) ....... 3-4
Acceleration and deceleration ................ 5-3
Air filter elements and check hoses
and V-belt case air filter element ....... 6-18
Anti-theft alarm (optional) ..................... 3-10
Auxiliary light ........................................ 6-35BBattery .................................................. 6-29
Brake fluid, changing............................ 6-26
Brake fluid level, checking.................... 6-24
Brake lever, front .................................. 3-11
Brake lever, rear ................................... 3-12
Brake levers, lubricating ....................... 6-27
Braking ................................................... 5-3CCables, checking and lubricating ......... 6-26
Care ........................................................ 7-1
Catalytic converters.............................. 3-15
Centerstand and sidestand, checking
and lubricating ................................... 6-27
Coolant ................................................. 6-16DDimmer switch...................................... 3-11EEngine break-in ...................................... 5-4
Engine oil and oil filter element............. 6-13
Engine trouble warning light ................... 3-4FFinal transmission oil ............................ 6-15
Front and rear brake lever free play,
checking ............................................. 6-23
Front and rear brake pads, checking ... 6-24Front fork, checking ............................. 6-28
Front turn signal light ........................... 6-33
Fuel ...................................................... 3-14
Fuel consumption, tips for reducing ...... 5-4
Fuel tank cap........................................ 3-13
Fuses, replacing ................................... 6-31
HHandlebar switches ............................. 3-10
Hazard switch ...................................... 3-11
Headlight bulb, replacing ..................... 6-32
High beam indicator light ....................... 3-4
Horn switch .......................................... 3-11IIdentification numbers ........................... 9-1
Ignition circuit cut-off system .............. 3-19
Immobilizer system ................................ 3-1
Immobilizer system indicator light ......... 3-4
Indicator lights and warning lights ......... 3-3LLicense plate light bulb, replacing ....... 6-34MMain switch/steering lock ...................... 3-2
Maintenance and lubrication, periodic... 6-4
Maintenance, emission control
system ................................................. 6-3
Matte color, caution ............................... 7-1
Model label............................................. 9-1
Multi-function display............................. 3-6PPanels, removing and installing ............. 6-8
Parking ................................................... 5-5
Part locations ......................................... 2-1
Pass switch .......................................... 3-11
SSafe-riding points ................................... 1-5
Safety information................................... 1-1
Seat....................................................... 3-16
Shock absorber assemblies,
adjusting ............................................. 3-18
Sidestand.............................................. 3-18
Spark plug, checking ............................ 6-11
Specifications ......................................... 8-1
Speedometer .......................................... 3-5
Starting off .............................................. 5-2
Starting the engine ................................. 5-1
Start switch ........................................... 3-11
Steering, checking ................................ 6-29
Storage ................................................... 7-4
Storage compartments ......................... 3-16TTachometer............................................. 3-6
Tail/brake light ...................................... 6-33
Throttle grip and cable, checking and
lubricating ........................................... 6-26
Throttle grip free play, checking ........... 6-20
Tires ...................................................... 6-21
Tool kit .................................................... 6-2
Troubleshooting .................................... 6-35
Troubleshooting charts ......................... 6-36
Turn signal indicator lights...................... 3-3
Turn signal light bulb (rear),
replacing ............................................. 6-33
Turn signal switch ................................. 3-11VValve clearance..................................... 6-20
Vehicle identification number ................. 9-1
U1SDE1E0.book Page 1 Monday, September 23, 2013 3:55 PM