YAMAHA DT125R 2002 Owner's Manual

3-8
INSTRUMENT AND CONTROL FUNCTIONS
3
EC000114
cCThe following precautions must be
observed to prevent a fire hazard
or other damages.
8Use only unleaded gasoline.
The use of leaded gasoline will
cause unrepairable damage to
the catalytic converter.
8Never park the motorcycle
near possible fire hazards
such as grass or other materi-
als that easily burn.
8Do not allow the engine to idle
too long.
EAU03750
2-stroke engine oilMake sure that there is sufficient oil in
the 2-stroke engine oil tank. Add the
recommended 2-stroke engine oil if
necessary.NOTE:
Make sure that the 2-stroke engine
oil tank cap is properly installed.
21
1. 2-stroke engine oil tank cap
2. Stopper
Recommended oil:
Yamalube 2 or equivalent
2-stroke engine oil (JASO
grade “FC”, or ISO grades
or “EG-D”)
Oil quantity:
1.2 L
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3-9
INSTRUMENT AND CONTROL FUNCTIONS
3
ON
With the lever in this position, fuel
flows to the carburetor. Normal riding
is done with the lever in this position.
ON
FUEL
RES
OFF
1
ON
1. Arrow mark positioned over “ON”
RES
This indicates reserve. If you run out
of fuel while riding, move the lever to
this position. Fill the tank at the first
opportunity. Be sure to set the lever
back to “ON” after refueling!
OFF
ONFUEL RES
1
RES
1. Arrow mark positioned over “RES”
EAU03050
Fuel cockThe fuel cock supplies fuel from the
tank to the carburetor while filtering it
also.
The fuel cock has three positions:
OFF
With the lever in this position, fuel will
not flow. Always return the lever to
this position when the engine is not
running.
RES
ONFUEL
OFF
1
1. Arrow mark positioned over “OFF”OFF: closed position
RES: reserve position
ON: normal position
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3-10
INSTRUMENT AND CONTROL FUNCTIONS
3
EAU03839
Starter (choke) lever“1”Starting a cold engine requires a rich-
er air-fuel mixture, which is supplied
by the starter (choke).
Move the lever in direction ato turn
on the starter (choke).
Move the lever in direction bto turn
off the starter (choke).
a
b
1
1. Starter (choke) lever “1”
EAU00212
KickstarterTo start the engine, fold out the kick-
starter lever, move it down lightly with
your foot until the gears engage, and
then push it down smoothly but force-
fully. This model is equipped with a
primary kickstarter, allowing the
engine to be started in any gear if the
clutch is disengaged. However, shift-
ing the transmission into the neutral
position before starting is recom-
mended.
1
1. Kickstarter
EAU02934
Steering lockTo lock the steering
1. Turn the handlebar all the way to
the right.
2. Open the steering lock cover,
and then insert the key.
3. Turn the key 1/8 turn counter-
clockwise, push it in while turning
the handlebar slightly to the left,
and then turn the key 1/8 turn
clockwise.
4. Check that the steering is locked,
remove the key, and then close
the lock cover.
2
1
1. Steering lock cover
2. Steering lock
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3-11
INSTRUMENT AND CONTROL FUNCTIONS
3 To unlock the steering
1. Open the steering lock cover,
and then insert the key.
2. Push the key in, turn it 1/8 turn
counterclockwise so that it
moves out, and then release it.
3. Remove the key, and then close
the lock cover.
EAU01648
SeatTo remove the seat
1. Remove panels A and B. (See
page 6-8 for panel removal and
installation procedures.)
2. Remove the bolts and pull the
seat off.
1
1. Bolt (
×2)
To install the seat
1. Insert the projections on the front
of the seat into the seat holders
as shown.
2. Place the seat in the original
position, and then tighten the
bolts.
3. Install the panels.NOTE:
Make sure that the seat is properly
secured before riding.
1
2
1. Projection (×2)
2. Holder (×2)
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3-12
INSTRUMENT AND CONTROL FUNCTIONS
3
EAU00261
Helmet holderTo open the helmet holder, insert the
key into the lock, and then turn the
key as shown.
To lock the helmet holder, turn the
key to the original position, and then
remove it.
EW000030
wNever ride with a helmet attached
to the helmet holder, since the hel-
met may hit objects, causing loss
of control and possibly an acci-
dent.
1
1. Open.
EAU03591
Adjusting the shock
absorber assemblyThis shock absorber assembly is
equipped with a spring preload
adjusting nut.
EC000015
cCNever attempt to turn an adjusting
mechanism beyond the maximum
or minimum settings.
b
a21
1. Locknut
2. Adjusting nutAdjust the spring preload as follows.
1. Loosen the locknut.
2. To increase the spring preload
and thereby harden the suspen-
sion, turn the adjusting nut in
direction a. To decrease the
spring preload and thereby soft-
en the suspension, turn the
adjusting nut in direction b.
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3-13
INSTRUMENT AND CONTROL FUNCTIONS
3 3. Tighten the locknut to the speci-
fied torque.
EC000018
cCAlways tighten the locknut against
the adjusting nut, and then tighten
the locknut to the specified torque.
EAU00315
wThis shock absorber contains
highly pressurized nitrogen gas.
For proper handling, read and
understand the following informa-
tion before handling the shock
absorber. The manufacturer can-
not be held responsible for proper-
ty damage or personal injury that
may result from improper han-
dling.
8Do not tamper with or attempt
to open the gas cylinder.
8Do not subject the shock
absorber to an open flame or
other high heat sources, other-
wise it may explode due to
excessive gas pressure.
8Do not deform or damage the
gas cylinder in any way, as
this will result in poor damp-
ing performance.
8Always have a Yamaha dealer
service the shock absorber.
NOTE:
The spring preload setting is deter-
mined by measuring distance A,
shown in the illustration. The shorter
distance A is, the lower the spring
preload; the longer distance A is, the
higher the spring preload.
A
Spring preload:
Minimum (soft):
Distance A = 235 mm
Standard:
Distance A = 230 mm
Maximum (hard):
Distance A = 220 mm
Tightening torque:
Locknut:
55 Nm (5.5 m0kgf)
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3-14
INSTRUMENT AND CONTROL FUNCTIONS
3
EAU00320
Carrier
EW000032
w8Do not exceed the load limit of
2 kg for the carrier.
8Do not exceed the maximum
load of 180 kg/178 kg (for CH,
A) for the vehicle.
1
1. Carrier
EAU00325
YEIS handling precautions Improper installation of or damage to
any part of the YEIS (Yamaha
Energy Induction System) will result
in poor performance. Therefore, han-
dle the YEIS air chamber and air
chamber hose with special care and
immediately replace any cracked or
damaged parts.
EC000022
cCDo not attempt to modify the YEIS
in any way.
12
1. YEIS air chamber
2. Air chamber hose
EAU00326
YPVSThis model is equipped with the
YPVS (Yamaha Power Valve
System). This system boosts engine
performance and efficiency by means
of a variable valve in the exhaust
port. The YPVS valve is constantly
adjusted in accordance with the
engine speed by a computer-con-
trolled servomotor.
Since the YPVS is an important part
of the engine and requires very
sophisticated adjustment, have a
Yamaha dealer, who has the neces-
sary professional knowledge and
experience, make this adjustment.
1
1. YPVS
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3-15
INSTRUMENT AND CONTROL FUNCTIONS
3
EC000023
cCThe YPVS has been set and exten-
sively tested at the Yamaha facto-
ry. Changing these settings with-
out sufficient technical knowledge
may result in poor performance of
or damage to the engine.YPVS operation noises can be heard
in the following instances:
8When the key is turned to “ON”
and the engine is started.
8When the engine stalls with the
key in the “ON” position.
EC000024
cCIf the YPVS does not operate, have
a Yamaha dealer check it.
EAU00330
SidestandThe sidestand is located on the left
side of the frame. Raise the side-
stand or lower it with your foot while
holding the motorcycle upright.NOTE:
The built-in sidestand switch is part of
the ignition circuit cut-off system,
which cuts the ignition in certain situ-
ations. (See further down for an
explanation of the ignition circuit cut-
off system.)
EW000044
wThe motorcycle must not be ridden
with the sidestand down, or if the
sidestand cannot be properly
moved up (or does not stay up),
otherwise the sidestand could con-
tact 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 responsibility of rais-
ing the sidestand before starting
off. Therefore, check this system
regularly as described below and
have a Yamaha dealer repair it if it
does not function properly.
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3-16
EAU03571
Ignition circuit cut-off
systemThe ignition circuit cut-off system
(comprising the sidestand switch and
neutral switch) has the following func-
tions.
8It prevents starting when the
transmission is in gear and the
sidestand is still down.
8It cuts the running engine when
the transmission is in gear and
the sidestand is moved down.
Periodically check the operation of
the ignition circuit cut-off system
according to the following procedure.
EW000045
wIf a malfunction is noted, have a
Yamaha dealer check the system
before riding.INSTRUMENT AND CONTROL FUNCTIONS
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3-17
INSTRUMENT AND CONTROL FUNCTIONS
3
With the engine turned off:
1. Move the sidestand down.
2. Make sure that the engine stop switch is set to “
#”.
3. Turn the key to “ON”.
4. Shift the transmission into the neutral position.
5. Push the kickstarter lever down.
Does the engine start?
The neutral switch may be defective.
The motorcycle should not be ridden until
checked by a Yamaha dealer.
With the engine still running:
6. Move the sidestand up.
7. Keep the clutch lever pulled.
8. Shift the transmission into gear.
9. Move the sidestand down.
Does the engine stall?
The sidestand switch may be defective.
The motorcycle should not be ridden until
checked by a Yamaha dealer.
NO
NOTE:This check is most reliable if performed with
a warmed-up engine.
YESYES NO
The system is OK. The motorcycle can be ridden.
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