2002 YAMAHA DT125R Owners Manual

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.
3MB-9-E8 6/13/01 10:55 AM Page 24

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)
3MB-9-E8 6/13/01 10:55 AM Page 25

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
3MB-9-E8 6/13/01 10:55 AM Page 26

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.
3MB-9-E8 6/13/01 10:55 AM Page 27

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
3 3MB-9-E8 6/13/01 10:55 AM Page 28

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.
3MB-9-E8 6/13/01 10:55 AM Page 29

4-1
EAU01114
PRE-OPERATION CHECKS
4The condition of a vehicle is the owner’s responsibility. Vital components can start to deteriorate quickly and unexpect-
edly, even if the vehicle remains unused (for example, as a result of exposure to the elements). Any damage, fluid leak-
age or loss of tire air pressure could have serious consequences. Therefore, it is very important, in addition to a thor-
ough visual inspection, to check the following points before each ride.
EAU03439
Pre-operation check list
ITEM CHECKS PAGE
Fuel•Check fuel level in fuel tank.
•Refuel if necessary.
•Check fuel line for leakage.3-5–3-7
2-stroke engine oil•Check oil level in oil tank.
•If necessary, add recommended oil to specified level.
•Check vehicle for oil leakage.3-8
Transmission oil•Check oil level in transmission case.
•If necessary, add recommended oil to specified level.6-10–6-12
Coolant•Check coolant level in reservoir.
•If necessary, add recommended coolant to specified level.
•Check cooling system for leakage.6-12–6-15
Front brake•Check operation.
•If soft or spongy, have Yamaha dealer bleed hydraulic system.
•Check lever free play.
•Adjust if necessary.
•Check fluid level in reservoir.
•If necessary, add recommended brake fluid to specified level.
•Check hydraulic system for leakage.3-5, 6-23, 6-24–6-26
Rear brake•Check operation.
•If soft or spongy, have Yamaha dealer bleed hydraulic system.
•Check fluid level in reservoir.
•If necessary, add recommended brake fluid to specified level.
•Check hydraulic system for leakage.3-5, 6-23–6-26
3MB-9-E8 6/13/01 10:55 AM Page 30

4-2
PRE-OPERATION CHECKS
4
Clutch•Check operation.
•Lubricate cable if necessary.
•Check lever free play.
•Adjust if necessary.3-4, 6-22
Throttle grip•Make sure that operation is smooth.
•Check free play.
•If necessary, have Yamaha dealer make adjustment or lubricate.6-18, 6-29
Control cables•Make sure that operation is smooth.
•Lubricate if necessary.6-29
Drive chain•Check chain slack.
•Adjust if necessary.
•Check chain condition.
•Lubricate if necessary.6-7–6-28
Wheels and tires•Check for damage.
•Check tire condition and tread depth.
•Check air pressure.
•Correct if necessary.6-19–6-21
Brake and shift pedals•Make sure that operation is smooth.
•Lubricate pedal pivoting points if necessary.6-30
Brake and clutch levers•Make sure that operation is smooth.
•Lubricate lever pivoting points if necessary.6-30
Sidestand•Make sure that operation is smooth.
•Lubricate pivot if necessary.6-31
Chassis fasteners•Make sure that all nuts, bolts and screws are properly tightened.
•Tighten if necessary.— ITEM CHECKS PAGE
3MB-9-E8 6/13/01 10:55 AM Page 31