INSTRUMENT AND CONTROL FUNCTIONS
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To lock the steering
1. Turn the handlebars all the way to
the left.
2. Push the key in from the “OFF” po-
sition, and then turn it to “LOCK”
while still pushing it.
3. Remove the key.
To unlock the steeringPush the key in, and then turn it to
“OFF” while still pushing it.
EAU10941
(Parking)
The steering is locked, and the taillight,
license plate light and auxiliary lights
are on. The hazard lights and turn sig-
nal lights can be turned on, but all other
electrical systems are off. The key can
be removed.
The steering must be locked before the
key can be turned to “ ”.
NOTICE
ECA11020
Do not use the parking position for
an extended length of time, other-
wise the battery may discharge.
EAU11004
Indicator and warning lights
EAU11030
Turn signal indicator lights “” and
“”
The corresponding indicator light flash-
es when the turn signal switch is
pushed to the left or right.
EAU11080
High beam indicator light “”
This indicator light comes on when thehigh beam of the headlight is switched
on.
EAU43023
Engine trouble warning light “”
This warning light comes on if an elec-
trical circuit monitoring the engine is not
working correctly. If this occurs, have a
Yamaha dealer check the self-diagno-
sis system.
The electrical circuit of the warning light
can be checked by turning the key to
“ON”. The warning light should come
on for a few seconds, and then go off.
If the warning light does not come on
initially when the key is turned to “ON”,
or if the warning light remains on, have
a Yamaha dealer check the electrical
circuit.
TIP
This 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.
1. Turn signal indicator lights “ ” and “ ”
2. High beam indicator light “ ”
3. Immobilizer system indicator light
4. Engine trouble warning light “ ”
5. Anti-lock Brake System (ABS) warning
light “ ” (for ABS models)
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ABS
INSTRUMENT AND CONTROL FUNCTIONS
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this does not indicate 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.
NOTICE
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.
EAU44910
Front brake lever
The front brake lever is located at the
right handlebar grip. To apply the front
brake, pull this lever toward the handle-
bar grip.
The front brake lever is equipped with a
position adjusting dial. To adjust the
distance between the front brake lever
and the handlebar grip, turn the adjust-
ing dial while holding the front brake le-
ver pushed away from the handlebar
grip. Make sure that the appropriate
setting on the adjusting dial is alignedwith the “” mark on the front brake le-
ver.
1. Front brake lever
2. Brake lever position adjusting dial
3.“” mark
4. Distance between brake lever and
handlebar grip1
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OPERATION AND IMPORTANT RIDING POINTS
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EAU16793
Braking
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.
1. Close the throttle completely.
2. Apply both front and rear brakes
simultaneously while gradually in-
creasing the pressure.
Front
Rear
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).
PERIODIC MAINTENANCE AND ADJUSTMENT
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EAU33473
Adjusting the rear brake lock
lever cable
Rear brake lock lever cable adjustment
may be required if the rear brake lock
lever does not hold properly. When the
rear brake lock lever is not in use, the
rear brake lock lever cable length
should measure 45 mm to 47 mm (1.77
in to 1.85 in) at the rear brake caliper.
Periodically check the rear brake lock
lever cable length and, if necessary,
adjust it as follows.
To increase the rear brake lock lever
cable length, turn the adjusting nut at
the rear brake caliper in direction (a).To decrease the rear brake lock lever
cable length, turn the adjusting nut in
direction (b).
WARNING
EWA10650
If proper adjustment cannot be ob-
tained as described, have a Yamaha
dealer make this adjustment.
EAU22392
Checking the front and rear
brake pads
The front and rear brake pads must be
checked for wear at the intervals spec-
ified in the periodic maintenance and
lubrication chart.
EAU22430
Front brake pads
Each front brake pad is provided with
wear indicator grooves, which allow
you to check the brake pad wear with-
out having to disassemble the brake.
To check the brake pad wear, check
the wear indicator grooves. If a brake
pad has worn to the point that the wear
1. Adjusting nut
2. Rear brake lock lever cable length
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(b) (a)
1. Wear indicator groove
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SPECIFICATIONS
EAU2633X
Dimensions:
Overall length:
2230 mm (87.8 in)
Overall width:
780 mm (30.7 in)
Overall height:
1380 mm (54.3 in)
Seat height:
760 mm (29.9 in)
Wheelbase:
1565 mm (61.6 in)
Ground clearance:
120 mm (4.72 in)
Minimum turning radius:
2600 mm (102.4 in)
Weight:
With oil and fuel:
YP400 220.0 kg (485 lb)
YP400A 223.0 kg (492 lb)
Engine:
Engine type:
Liquid cooled 4-stroke, DOHC
Cylinder arrangement:
Forward-inclined single cylinder
Displacement:
395 cm
3
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 stan-
dard 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 maxi-
mum level mark):
0.32 L (0.34 US qt, 0.28 Imp.qt)
Radiator capacity (including all routes):
1.57 L (1.66 US qt, 1.38 Imp.qt)
Air filter:
Air filter element:
Oil-coated paper element
Fuel:
Recommended fuel:
Regular unleaded gasoline only
Fuel tank capacity:
14.0 L (3.70 US gal, 3.08 Imp.gal)
Fuel injection:
Throttle body:
ID mark:
5RUG 20
Spark plug (s):
Manufacturer/model:
NGK/CR7E
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
Clutch:
Clutch type:
Dry, centrifugal automatic
Transmission:
Primary reduction system:
Helical gear
Primary reduction ratio:
31/14 (2.214)
Secondary reduction system:
Helical gear
-20 -10 0
10 20 30
40
50 ˚C
SAE 10W-30
SAE 15W-40SAE 20W-40SAE 20W-50
SAE 10W-40SAE 10W-50