Page 24 of 96

 
INSTRUMENT AND CONTROL FUNCTIONS 
3-8 
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9 
er system.
If any of the immobilizer system circuits
are defective, the immobilizer system
indicator light will flash, and then the
multi-function display will indicate a
two-digit error code when the key is
turned to “ON”.
NOTE:
 
If the multi-function display indicates er-
ror code 52, this could be caused by
transponder interference. If this error 
appears, try the following.
1. Use the code re-registering key to
start the engine.
NOTE:
 
Make sure there are no other immobi-
lizer keys close to the main switch, and
do not keep more than one immobilizer
key on the same key ring! Immobilizer
system keys may cause signal interfer-
ence, which may prevent the engine 
from starting.
2. If the engine starts, turn it off, and
try starting the engine with the
standard keys.
3. If one or both of the standard keys
do not start the engine, take thevehicle, the code re-registering
key and both standard keys to a
Yamaha dealer and have the stan-
dard keys re-registered.
If the multi-function display indicates
any error codes, note the code number,
and then have a Yamaha dealer check
the vehicle. 
Clock mode 
To set the clock:
1. Push the “SELECT” button and
“RESET” button together for at
least two seconds.
2. When the hour digits start flashing,
push the “RESET” button to set the
hours.
3. Push the “SELECT” button, and
the minute digits will start flashing.
4. Push the “RESET” button to set
the minutes.
5. Push the “SELECT” button and
then release it to start the clock.
Pushing the “SELECT” button for
at least two seconds switches the
clock display to the ambient tem-
perature display. 
Ambient temperature display  
This display shows the ambient tem-
perature from –10 °C to 50 °C in 1 °C
increments. The temperature displayed
may vary from the ambient tempera-
ture. Pushing the “SELECT” button for
at least two seconds switches the am-
bient temperature display to the clock
display.
NOTE:
 
 
If the ambient temperature falls be-
low –10 °C, a lower temperature
than –10 °C will not be displayed. 
 
If the ambient temperature climbs
above 50 °C, a higher temperature
than 50 °C will not be displayed. 
 
The accuracy of the temperature
reading may be affected when
riding slowly (approximately under
20 km/h (12.5 mi/h)) or when
stopped at traffic signals, railroad 
crossings, etc. 
         
        
        
     
        
        Page 25 of 96
 
INSTRUMENT AND CONTROL FUNCTIONS 
3-9 
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9
 
EAU12331 
Anti-theft alarm (optional)  
This model can be equipped with an
optional anti-theft alarm by a Yamaha
dealer. Contact a Yamaha dealer for
more information. 
EAU12347 
Handlebar switches  
LeftRight 
EAU12360 
Pass switch “PASS”   
Press this switch to flash the headlight. 
EAU12400 
Dimmer switch “/”   
Set this switch to “” for the high
beam and to “” for the low beam. 
EAU12460 
Turn signal switch “/”   
To signal a right-hand turn, push this
switch to “”. To signal a left-hand
turn, push this switch to “”. When re- 
1. Pass switch “PASS”
2. Dimmer switch “/”
3. Turn signal switch “/”
4. Horn switch “”
1
2
3
4
 
1. Engine stop switch “/”
2. Hazard switch “”
3. Start switch “”
1
2
3 
         
        
        
     
        
        Page 26 of 96

 
INSTRUMENT AND CONTROL FUNCTIONS 
3-10 
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9 
leased, the switch returns to the center
position. To cancel the turn signal
lights, push the switch in after it has re-
turned to the center position.
 
EAU12500 
Horn switch “”  
Press this switch to sound the horn. 
EAU12660 
Engine stop switch “/”  
Set this switch to “” before starting
the engine. Set this switch to “” to
stop the engine in case of an emergen-
cy, such as when the vehicle overturns
or when the throttle cable is stuck. 
EAU12720 
Start switch “”  
With the sidestand up, push this switch
while applying the front or rear brake to
crank the engine with the starter.
CAUTION:
 
 ECA10050 
See page 5-1 for starting instruc- 
tions prior to starting the engine. 
EAU42810 
(for ABS models)
The engine trouble warning light and
ABS warning light will come on when
the key is turned to “ON” and the start
switch is pushed, but this does not indi-
cate a malfunction. 
EAU12733 
Hazard switch “”   
With the key in the “ON” or “” posi-
tion, use this switch to turn on the haz-
ard lights (simultaneous flashing of all
turn signal lights).
The hazard lights are used in case of
an emergency or to warn other drivers
when your vehicle is stopped where it
might be a traffic hazard.
CAUTION:
 
 ECA10061 
Do not use the hazard lights for an
extended length of time with the en-
gine not running, otherwise the bat- 
tery may discharge. 
EAU12900 
Front brake lever  
The front brake lever is located on the
right handlebar grip. To apply the front
brake, pull this lever toward the handle-
bar grip. 
1. Front brake lever
1 
         
        
        
     
        
        Page 34 of 96

 
INSTRUMENT AND CONTROL FUNCTIONS 
3-18 
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9being washed, wrap any articles
stored in the compartment in a
plastic bag.
 
 
Do not keep anything valuable
or breakable in the storage com- 
partment.
CAUTION:
 
 ECA11100 
Do not leave the rider seat open for
an extended period of time, other-
wise the light may cause the battery 
to discharge.
WARNING
 
EWA11170 
Do not exceed the following loading
limits: 
 
Front storage compartment A:
2 kg (4 lb) 
 
Rear storage compartment: 5 kg
(11 lb) 
 
Maximum load for the vehicle:
YP400 189 kg (417 lb)/YP400A 
185 kg (408 lb) 
EAU14890 
Adjusting the shock absorber 
assemblies  
Each shock absorber assembly is
equipped with a spring preload adjust-
ing ring.
CAUTION:
 
 ECA10100 
Never attempt to turn an adjusting
mechanism beyond the maximum or 
minimum settings.
WARNING
 
EWA10210 
Always adjust both shock absorber
assemblies equally, otherwise poorhandling and loss of stability may 
result.  
Adjust the spring preload as follows.
To increase the spring preload and
thereby harden the suspension, turn
the adjusting ring on each shock ab-
sorber assembly in direction (a). To de-
crease the spring preload and thereby
soften the suspension, turn the adjust-
ing ring on each shock absorber as-
sembly in direction (b).
NOTE:
 
 
Align the appropriate notch in the
adjusting ring with the position in-
dicator on the shock absorber. 
 
Use the spring preload adjusting
tool included in the owner’s tool kit 
to make this adjustment. 
1. Spring preload adjusting ring
2. Position indicator
3. Spring preload adjusting tool
1
3
2
(b)(a)
12 3 4
5
 
Spring preload setting:  
Minimum (soft):
1
Standard:
2
Maximum (hard):
5 
         
        
        
     
        
        Page 35 of 96

 
INSTRUMENT AND CONTROL FUNCTIONS 
3-19 
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9
 
EAU15301 
Sidestand  
The sidestand is located on the left side
of the frame. Raise the sidestand or
lower it with your foot while holding the
vehicle upright.
NOTE:
 
The built-in sidestand switch is part of
the ignition circuit cut-off system, which
cuts the ignition in certain situations.
(See further down for an explanation of 
the ignition circuit cut-off system.)
WARNING
 
EWA10240 
The vehicle must not be ridden with
the sidestand down, or if the side-
stand cannot be properly moved up
(or does not stay up), otherwise the
sidestand could contact the ground
and distract the operator, resulting
in a possible loss of control.
Yamaha’s ignition circuit cut-off
system has been designed to assist
the operator in fulfilling the respon-
sibility of raising the sidestand be-
fore starting off. Therefore, check
this system regularly as described
below and have a Yamaha dealer re-pair it if it does not function proper- 
ly. 
EAU15371 
Ignition circuit cut-off system  
The ignition circuit cut-off system (com-
prising the sidestand switch and brake
light switches) has the following func-
tions. 
 
It prevents starting when the side-
stand is up, but neither brake is ap-
plied. 
 
It prevents starting when either
brake is applied, but the sidestand
is still down. 
 
It cuts the running engine when the
sidestand is moved down.
Periodically check the operation of the
ignition circuit cut-off system according
to the following procedure.
WARNING
 
EWA10250 
If a malfunction is noted, have a
Yamaha dealer check the system be- 
fore riding. 
         
        
        
     
        
        Page 39 of 96
 
PRE-OPERATION CHECKS 
4-3 
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45
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9
 
Wheels and tires 
 
Check for damage. 
 
Check tire condition and tread depth. 
 
Check air pressure. 
 
Correct if necessary.6-21, 6-23  
Brake levers 
 
Make sure that operation is smooth. 
 
Lubricate lever pivoting points if necessary.6-28  
Centerstand, sidestand 
 
Make sure that operation is smooth. 
 
Lubricate pivots if necessary.6-28  
Chassis fasteners 
 
Make sure that all nuts, bolts and screws are properly tightened. 
 
Tighten if necessary.—  
Instruments, lights, signals 
and switches 
 
Check operation. 
 
Correct if necessary.—  
Sidestand switch 
 
Check operation of ignition circuit cut-off system. 
 
If system is defective, have Yamaha dealer check vehicle.3-19  
ITEM CHECKS PAGE 
         
        
        
     
        
        Page 42 of 96
 
OPERATION AND IMPORTANT RIDING POINTS 
5-3 
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9Rear
WARNING
 
EWA10300 
 
Avoid braking hard or suddenly
(especially when leaning over to
one side), otherwise the scooter
may skid or overturn. 
 
Railroad crossings, streetcar
rails, iron plates on road con-
struction sites, and manhole
covers become extremely slip-
pery when wet. Therefore, slow
down when approaching such
areas and cross them with cau-
tion. 
 
Keep in mind that braking on a
wet road is much more difficult. 
 
Ride slowly down a hill, as brak-
ing downhill can be very diffi- 
cult. 
EAU16820 
Tips for reducing fuel 
consumption  
Fuel consumption depends largely on
your riding style. Consider the following
tips to reduce fuel consumption: 
 
Avoid high engine speeds during
acceleration. 
 
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). 
         
        
        
     
        
        Page 48 of 96
 
PERIODIC MAINTENANCE AND MINOR REPAIR 
6-5 
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EAU34490
NOTE:
 
 
The air filters and V-belt filter need more frequent service if you are riding in unusually wet or dusty areas. 
 
Hydraulic brake service 
 
Regularly check and, if necessary, correct the brake fluid level. 
 
Every two years replace the internal components of the brake master cylinders and calipers, and change the brake
fluid. 
 
Replace the brake hoses every four years and if cracked or damaged. 
26
 
Moving parts and cables 
 
Lubricate. 
√√√√ √ 
27
 
* 
Throttle grip housing 
and cable 
 
Check operation and free play. 
 
Adjust the throttle cable free play if necessary. 
 
Lubricate the throttle grip housing and cable. 
√√√√ √ 
28
 
* 
Lights, signals and 
switches 
 
Check operation. 
 
Adjust headlight beam. 
√√√√√ √  
NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (  
×  
 1000 km)
ANNUAL 
CHECK
1 10203040