
PERIODIC MAINTENANCE AND ADJUSTMENT
6-32
6 YP400RA
3. Turn the key to “ON” and turn on
the electrical circuit in question to
check if the device operates.
4. If the fuse immediately blows
again, have a Yamaha dealer
check the electrical system.
EAU34242
Replacing a headlight bulbThis model is equipped with halogen
bulb headlights. If a headlight bulb
burns out, have a Yamaha dealer re-
place it and, if necessary, adjust the
headlight beam.
1. Radiator fan fuse
2. ECU fuse
3. Backup fuse
4. Signaling system fuse
5. Headlight fuse
6. Ignition fuse
7. Spare fuse
8. Hazard fuse
9. ABS control unit fuse
10.ABS motor fuse
11.ABS solenoid fuseZAUM1129
10
10
10
20
30
30
7
7
11
1
2
3
4
56
20 1020
1010 1010
7.57.5
9
10
Specified fuses:
Main fuse:
30.0 A
Ignition fuse:
10.0 A
Signaling system fuse:
10.0 A
Headlight fuse:
20.0 A
Hazard fuse:
10.0 A
Radiator fan fuse:
7.5 A
ABS control unit fuse:
YP400RA 10.0 A
ABS motor fuse:
YP400RA 30.0 A
ABS solenoid fuse:
YP400RA 20.0 A
Backup fuse:
10.0 A
U1SDE1E0.book Page 32 Monday, September 23, 2013 3:55 PM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-35
6
EAU54501
Auxiliary lightThis model is equipped with LED-type
auxiliary lights.
If an auxiliary light does not come on,
have a Yamaha dealer check it.
EAU25882
TroubleshootingAlthough Yamaha scooters receive a
thorough inspection before shipment
from the factory, trouble may occur
during operation. Any problem in the
fuel, compression, or ignition systems,
for example, can cause poor starting
and loss of power.
The following troubleshooting charts
represent quick and easy procedures
for checking these vital systems your-
self. However, should your scooter re-
quire any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the scooter prop-
erly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look
like Yamaha parts, but they are often
inferior, have a shorter service life and
can lead to expensive repair bills.
WARNING
EWA15142
When checking the fuel system, do
not smoke, and make sure there are
no open flames or sparks in the ar-
ea, including pilot lights from waterheaters or furnaces. Gasoline or
gasoline vapors can ignite or ex-
plode, causing severe injury or prop-
erty damage.
U1SDE1E0.book Page 35 Monday, September 23, 2013 3:55 PM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-36
6
EAU42706
Troubleshooting chartsStarting problems or poor engine performance
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.
There is no fuel.
Check the battery.
Supply fuel.
The engine does not start.
Check the battery.
Operate the electric starter.4. Compression
There is compression.
There is no compression.
The engine does not start.
Have a Yamaha dealer check the vehicle.Have a Yamaha dealer check the vehicle.
Remove the spark plug
and check the electrodes.3. Ignition
Wipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug.
Have a Yamaha dealer check the vehicle.
The engine does not start.
Check the compression.
Operate the electric starter.2. Battery
The engine turns over
quickly.
The engine turns over
slowly.
The battery is good.
DryWet
Operate the electric starter.
Check the battery lead connections,
and have a Yamaha dealer charge
the battery if necessary.
The engine does not start.
Check the ignition.
U1SDE1E0.book Page 36 Monday, September 23, 2013 3:55 PM

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

SPECIFICATIONS
8-3
8
Voltage, capacity:
12 V, 8.0 AhHeadlight:Bulb type:
Halogen bulbBulb voltage, wattage × quantity:Headlight:
12 V, 55.0 W × 2
Tail/brake light:
LED
Front turn signal light:
12 V, 10.0 W × 2
Rear turn signal light:
12 V, 10.0 W × 2
Auxiliary light:
LED
License plate light:
12 V, 5.0 W × 1
Meter lighting:
12 V, 2.0 W × 3
High beam indicator light:
12 V, 1.4 W × 1
Turn signal indicator light:
12 V, 1.4 W × 2
Engine trouble warning light:
12 V, 1.4 W × 1
ABS warning light:
YP400RA 12 V, 1.4 W × 1
Immobilizer system indicator light:
LEDFuses:Main fuse:
30.0 AHeadlight fuse:
20.0 A
Signaling system fuse:
10.0 A
Ignition fuse:
10.0 A
Radiator fan fuse:
7.5 A
Hazard fuse:
10.0 A
ECU fuse:
10.0 A
ABS control unit fuse:
YP400RA 10.0 A
ABS motor fuse:
YP400RA 30.0 A
ABS solenoid fuse:
YP400RA 20.0 A
Backup fuse:
10.0 A
U1SDE1E0.book Page 3 Monday, September 23, 2013 3:55 PM

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