2000 YAMAHA DT125R engine

3-8
INSTRUMENT AND CONTROL FUNCTIONS
1
23
4
5
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8
9
EW000130
wDo not overfill the fuel tank. Avoid
spilling fuel on the hot engine. Do
not fill the fuel tank above the bot-
tom of the filler tube or it may
overflow when the fuel heats up
later and expands.
EAU00185
cCAlways wipe off spilled fuel imme-
diately with a dry and clean soft
cloth. Fuel may deteriorate painted
surfaces or plastic parts.
EAU00191
NOTE:
If knocking or pinging occurs, use a
different brand of gasoline or higher
octane grade.
EAU01084
Catalyzer(for Switzerland and Austria)
This motorcycle is equipped with a
catalytic converter in the exhaust
chamber.
EW000128
wThe exhaust system is hot during
and directly after engine operation.
Make sure the exhaust system has
cooled down before making any
adjustment to or lubricating the
motorcycle.
Recommended fuel:
Regular unleaded gasoline
with a research octane
number of 91 or higher.
Fuel tank capacity:
Total:
10.0 L
Reserve:
1.8 L
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3-9
INSTRUMENT AND CONTROL FUNCTIONS
1
23
4
5
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8
9
EC000114
cCThe following must be observed to
prevent a fire hazard or other dam-
ages.
8 8
Use only unleaded gasoline.
Use of leaded gasoline will
cause unrepairable damage to
the catalytic converter.
8 8
Never park this motorcycle in
an area that would cause a fire
hazard such as grass or other
materials that may easily burn.
8 8
Do not allow the engine to idle
for very long.
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 ÒOFFÓ
EAU02956
Two-stroke engine oilMake sure there is sufficient two-
stroke engine oil in the oil tank. Add
the recommended oil as necessary.
21
1.Oil tank cap
2.Stopper
Recommended oil:
Yamalube 2 or 2-stroke
engine oil (JASO FC grade or
ISO EG-C, EG-D grade)
Oil quantity:
1.2 L
OFF: closed position
3MB-9-E7 12/27/00 2:52 PM Page 21

3-10
INSTRUMENT AND CONTROL FUNCTIONS
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23
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8
9
ON
FUEL
RES
OFF
1
ON
1.Arrow mark positioned ÒONÓON
With the lever in this position, fuel
flows to the carburetor. Normal riding
is done with the lever in this position.ON: normal position
a
b
1
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 ÒONÓ after refueling!
EAU02976
Starter (choke) Ò1ÓStarting a cold engine requires a rich-
er air-fuel mixture. A separate starter
circuit supplies this mixture.
Move in direction ato turn on the
starter (choke).
Move in direction bto turn off the
starter (choke).1.Starter (choke) Ò1Ó
OFF
ONFUEL RES
1
RES
1.Arrow mark positioned ÒRESÓRES: reserve position
3MB-9-E7 12/27/00 2:52 PM Page 22

3-11
INSTRUMENT AND CONTROL FUNCTIONS
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23
4
5
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8
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1
EAU00212
Kick starterRotate the kick starter away from the
engine. Push the starter down lightly
with your foot until the gears engage,
then kick smoothly and forcefully to
start the engine. This model has a
primary-coupled kick starter so the
engine can be started in any gear if
the clutch is disengaged. However,
shifting to neutral before starting is
recommended.1.Kick starter
EAU02934
Steering lockTo lock the steering
Turn the handlebars all the way to
the right and open the steering lock
cover.
Insert the key and turn it 1/8 turn
counterclockwise. Then, push the key
in while turning the handlebars slight-
ly to the left and turn the key 1/8 turn
clockwise.
Check that the steering is locked,
remove the key and close the lock
cover.
1
1.Steering lock
To unlock the steering
Insert the key, push it in and turn it
1/8 turn counterclockwise so that it
moves out. Then, release and
remove the key.
3MB-9-E7 12/27/00 2:52 PM Page 23

3-15
INSTRUMENT AND CONTROL FUNCTIONS
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23
4
5
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9
EC000023
cCThe Y.P.V.S. was set at the
Yamaha factory after many tests. If
the settings are disturbed by
someone without sufficient techni-
cal knowledge, poor engine perfor-
mance and damage may result.The Y.P.V.S. operation can be heard
in the following instances:
8When the main switch is turned
on and the engine is started.
8When the engine stalls while the
main switch is on.
EC000024
cCIf the Y.P.V.S. does not operate,
ask a Yamaha dealer to inspect the
vehicle.
1
1.Y.P.V.S.
EAU00326
Y.P.V.S. (Yamaha Power
Valve System)The Y.P.V.S. is a vital part of the
engine and requires very sophisticat-
ed adjustment. Adjustment should be
left to a Yamaha dealer who has the
professional knowledge and experi-
ence to do so.
EAU00330
SidestandThis model is equipped with an igni-
tion circuit cut-off system. The motor-
cycle must not be ridden when the
sidestand is down. The sidestand is
located on the left side of the frame.
(Refer to page 5-1 for an explanation
of this system.)
3MB-9-E7 12/27/00 2:52 PM Page 27

EW000045
wIf improper operation is noted,
consult a Yamaha dealer immedi-
ately.
3-16
INSTRUMENT AND CONTROL FUNCTIONS
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23
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5
6
7
8
9
ENGINE WILL STALL.SIDESTAND SWITCH IS OK.
EAU00333
Sidestand switch operation
checkCheck the operation of the sidestand
switch against the information below.TURN THE MAIN SWITCH TO ÒONÓ AND
THE ENGINE STOP SWITCH TO Ò#Ó.TRANSMISSION IS IN NEUTRAL AND
SIDESTAND IS DOWN.PULL IN THE CLUTCH LEVER AND
PUT TRANSMISSION IN GEAR.ENGINE WILL START.KICK THE KICK STARTER.
EW000044
wThis motorcycle must not be oper-
ated with the sidestand in the
down position. If the stand is not
properly retracted, it could contact
the ground and distract the opera-
tor, resulting in a possible loss of
control. Yamaha has designed into
this motorcycle a lockout system
to assist the operator in fulfilling
the responsibility of retracting the
sidestand. Please check carefully
the operating instructions listed
below and if there is any indication
of a malfunction, return the motor-
cycle to a Yamaha dealer immedi-
ately for repair.
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4-1
EAU01114
PRE-OPERATION CHECKS
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2
34
5
6
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8
9 Owners are personally responsible for their vehicleÕs condition. Your motorcycleÕs vital functions can start to deteriorate
quickly and unexpectedly, even if it remains unused (for instance, if it is exposed to the elements). Any damage, fluid
leak or loss of tire pressure could have serious consequences. Therefore, it is very important that, in addition to a thor-
ough visual inspection, you check the following points before each ride.
EAU00340
PRE-OPERATION CHECK LIST
ITEMCHECKSPAGE
Front brake9Check operation, free play, fluid level and vehicle for fluid leakage.
9Fill with DOT 4 (or DOT 3) brake fluid if necessary.
3-6, 6-21 ~ 6-25
Rear brake9Check operation, free play, fluid level and vehicle for fluid leakage.
9Fill with DOT 4 (or DOT 3) brake fluid if necessary.
Clutch9Check operation, condition and free play.
3-5, 6-21
9Adjust if necessary.
9Check for smooth operation.
Throttle grip and housing9Lubricate.6-17, 6-27
9Adjust throttle cable free play if necessary.
Engine oil9Check oil level.
3-9
9Fill with oil if necessary.
Transmission oil9Check oil level.
6-11 ~ 6-12
9Fill with oil if necessary.
Coolant9Check coolant level.
6-12
9Fill with coolant if necessary.
Drive chain9Check chain slack and condition.
6-26 ~ 6-27
9Adjust if necessary.
Wheels and tires9Check tire pressure, wear, damage and spoke tightness.
6-18 ~ 6-20
9Tighten spokes if necessary.
Control and meter cable9Check for smooth operation.
6-27
9Lubricate if necessary.
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5-1
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EAU00373
w8 8
Before riding this motorcycle,
become thoroughly familiar
with all operating controls and
their functions. Consult a
Yamaha dealer regarding any
control or function that you do
not thoroughly understand.
8 8
Never start your engine or let
it run for any length of time in
a closed area. The exhaust
fumes are poisonous and can
cause loss of consciousness
and death within a short time.
Always operate your motorcy-
cle in an area with adequate
ventilation.
8 8
Before starting out, always be
sure the sidestand is up.
Failure to retract the sidestand
completely can result in a seri-
ous accident when you try to
turn a corner.
EAU01177
Starting the engineNOTE:
This motorcycle is equipped with an
ignition circuit cut-off system. The
engine can be started only under one
of the following conditions:
8The transmission is in neutral.
8The sidestand is up, the trans-
mission is in gear and the clutch
is disengaged.
The motorcycle must not be ridden
when the sidestand is down.
EW000056
wBefore going through the following
steps, check the function of the
sidestand switch. (Refer to page
3-16.)
EAU00372
OPERATION AND IMPORTANT RIDING POINTS
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