Yamaha DT125X Owner's Manual

1D0-F8199-E2DT125RDT125XOWNER’S MANUAL1D0-F8199-E2.qxd 20/9/04 11:32 Página 1

Loading and accessoriesAdding accessories or cargo to yourmotorcycle can adversely affect sta-bility and handling if the weight distri-bution of the m

• Bulky or large accessories mayseriously affect the stability ofthe motorcycle due to aerody-namic effects. Wind mayattempt to lift the motorcycle,or

EAU10410Left viewDESCRIPTION2-121 728 563 491. Headlight (page 6-24)2. Radiator cover (page 6-5)3. Fuel cock (page 3-7)4. Air filter (page 6-10)5. Cho

EAU10420Right viewDESCRIPTION2-22131112 1411. Tool kit (page 6-1)12. Fuse (page 6-24)13. Coolant tank (page 6-8)14. Rear brake pedal (page 3-5)1D0-F81

EAU10430Controls and instrumentsDESCRIPCION2-320km/h40608010012013020y0000150008161718 192022232116. Clutch lever (page 3-4)17. Left handlevar swicht

EAU10460Main switch/steering lockThe main switch/steering lock con-trols the ignition and lighting systems,and is used to lock the steering. Thevariou

EAU11002Indicator and warning lights1. Turn signal indicator light “b”2. Dimmer indicator light “j”3. Neutral indicator light “N”4. Oil level warning

EAU11640Speedometer unit1. Odometer2. Tripmeter3. Reset button4. Coolant temperature warning lampThe speedometer unit is equippedwith a speedometer, a

stop the engine in case of an emer-gency, such as when the motorcycleoverturns or when the throttle cable isstuck.EAU12710Start switch “g”Push this sw

EAU12890Brake lever1. Brake leverThe brake lever is located at the righthandlebar grip. To apply the front bra-ke, pull the lever toward the handle-ba

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NOTE:The fuel tank cap cannot be installedunless the key is in the lock. In addi-tion, the key cannot be removed if thecap is not properly installed a

ECA10700CAUTIONThe following precautions must beobserved to prevent a fire hazard orother damages.● Use only unleaded gasoline.The use of leaded gasol

RESThis indicates reserve. If you run outof fuel while riding, move the lever tothis position. Fill the tank at the firstopportunity. Be sure to set t

EAU15090Shock absorberEWA10220ssWARNINGThis shock absorber containshighly pressurized nitrogen gas.For proper handling, read andunderstand the followi

ECA10150CAUTIONThe YPVS has been set and exten-sively tested at the Yamaha factory.Changing these settings withoutsufficient technical knowledge mayre

NOTE:This check is most reliable if performed with a warmed-up engine.INSTRUMENT AND CONTROL FUNCTIONS3-113With the engine turned off:1. Move the side

EAU15591The condition of a vehicle is theowner’s responsibility. Vital compo-nents can start to deteriorate quicklyand unexpectedly, even if the vehic

PRE-OPERATION CHECKS4-24EAU15603Pre-operation check listITEM CHECKS PAGE• Check fuel level in fuel tank.Fuel • Refuel if necessary. 3-6• Check fuel li

Control cables• Make sure that operation is smooth.6-21• Lubricate if necessary.• Check chain slack.Drive chain• Adjust if necessary.6-19/6-20• Check

EAU15950EWA10270ssWARNING● Become thoroughly familiarwith all operating controls andtheir functions before riding.Consult a Yamaha dealerregarding any

EAU10100Welcome to the Yamaha world of motorcycling!As the owner of the DT125R/X, you are benefiting from Yamaha’s vast experience and newest technolo

7. When the engine is warm, turnthe starter (choke) off.NOTE:The engine is warm when it respondsnormally to the throttle with the starter(choke) turne

After every hour of operation, stop theengine, and then let it cool for five toten minutes.Vary the engine speed from time totime. Do not operate the

EAU17240Safety is an obligation of the owner.Periodic inspection, adjustment andlubrication will keep your vehicle inthe safest and most efficient con

EAU17710Periodic maintenance and lubrication chartNOTE:● The annual checks must be performed every year, except if a kilometer-based maintenance is pe

ODOMETER READING (x 1000 Km) ANNUALCHECKNo ITEM CHECK OR MAINTENANCE JOB 1 6 12 18 249*Tires• Check tread depth and for damage.• Replace if necessary.

ODOMETER READING (x 1000 Km) ANNUALCHECKNo ITEM CHECK OR MAINTENANCE JOB 1 6 12 18 2422 Transmission oil• Check oil level. √√ √ √√ √• Change. √√23 * C

EAU18711Removing and installingcowlings and panels1. Cowling A2. Cowling B3. Panel D1. Cowling C2. Panel EThe cowlings and panels shown needto be remo

EAU19292Panels D and E1. ScrewTo remove one of the panelsRemove the screw, and then pull thepanel off as shown.To install the panelPlace the panel in

Tightening torque:Spark plug:20 Nm (2 m•kgf)NOTE:If a torque wrench is not availablewhen installing a spark plug, a goodestimate of the correct torque

1. Start the engine, warm it up forseveral minutes, and then turn itoff.2. Place an oil pan under the trans-mission to collect the used oil.3. Remove

EAU10150Particularly important information is distinguished in this manual by the following notations:IMPORTANT MANUAL INFORMATIONCAUTION A CAUTION in

NOTE:The coolant should be between theminimum and maximum level marks.4. If the coolant is at or below theminimum level mark, open thereservoir cap, a

Tightening torque:Coolant drain bolt:10 Nm (1,0 m•kgf)8. Connect the coolant reservoirhose.9. Pour the recommended coolantinto the radiator until it i

To clean the air filter element1. Remove panel E. (See page 6-6.)2. Remove the air filter case coverby removing the screws.3. Pull the air filter elem

EAU21340Adjusting the engine idlingspeed1. Idle adjusting boltThe engine idling speed must bechecked and, if necessary, adjustedas follows at the inte

EAU21590TiresTo maximize the performance, durabi-lity, and safe operation of yourmotorcycle, note the following pointsregarding the specified tires.Ti

Tire inspection1.Wear limit2. Side wallThe tires must be checked beforeeach ride. If the center tread depthreaches the specified limit, if the tirehas

EWA10570ssWARNING● Have a Yamaha dealer replaceexcessively worn tires. Besidesbeing illegal, operating themotorcycle with excessivelyworn tires decrea

NOTE:If the specified clutch lever free playcould be obtained as described abo-ve, tighten the locknut and skip therest of the procedure, otherwise pr

EAU22192Adjusting the brake pedalposition and free play1. Footrest(a) Brake pedal positionEWA10670ssWARNINGIt is advisable to have a Yamahadealer make

Turn the adjusting nut while holdingthe rear brake light switch in place. Tomake the brake light come on earlier,turn the adjusting nut in direction (

EAUS1171IMPORTANT MANUAL INFORMATIONDT125R/XOWNER’S MANUAL©2004 by YAMAHA MOTOR SPAIN S.A.1st edition, July 2004All rights reservedAny reprinting or u

Recommended brake fluid:DOT 4● Refill with the same type of brakefluid. Mixing fluids may result in aharmful chemical reaction andlead to poor braking

EAU22960To adjust the drive chain slack1. Axle nut2. Chain tensioner1. Loosen the axle nut.2. To tighten the drive chain, turnthe adjusting plate on e

EAU23100Checking and lubricating thecablesThe operation of all control cablesand the condition of the cablesshould be checked before each ride,and the

Recommended lubricant:Lithium-soap-based grease (all-pur-pose grease)EAU23271Checking the front forkThe condition and operation of thefront fork must

2. Hold the lower ends of the frontfork legs and try to move themforward and backward. If any freeplay can be felt, have a Yamahadealer check or repai

2. If the battery will be stored formore than two months, check itat least once a month and fullycharge it if necessary.3. Fully charge the battery be

This model is equipped with quartzbulb headlights. If a headlight bulbburns out, replace it as follows.1. Remove cowling A. (See page 6-5.)2. Disconne

ECA10680CAUTIONDo not overtighten the screws,otherwise the lens may break.EAU24201Replacing a turn signal lightbulb1. Screw2. Lens3. Bulb1. Remove the

EWA10820ssWARNING● It is advisable to have a Yama-ha dealer service the wheel.● Securely support the motorcy-cle so that there is no danger ofit falli

1. Gap7. After tightening the axle holdernuts, push down hard on thehandlebars several times whileapplying the front brake to checkif the front fork c

SAFETY INFORMATION...1-1DESCRIPTION...2-1Left view ...2-1R

ECA11070CAUTIONDo not apply the brake after thewheel has been removed togetherwith the brake disc, otherwise thebrake pads will be forced shut.EAU2553

EAU25921Troubleshooting chartsStarting problems or poor engine performanceEWA10840ssWARNINGKeep away open flames and do not smoke while checking or wo

NOTE:If coolant is not available, tap water can be temporarily used instead, provided that it is changed to the recommendedcoolant as soon as possible

EAU26000CareWhile the open design of a motorcy-cle reveals the attractiveness of thetechnology, it also makes it more vul-nerable. Rust and corrosion

ve any marks. If the windshieldis scratched, use a qualityplastic polishing compoundafter washing.After normal useRemove dirt with warm water, a mildd

ECA10800CAUTION● Apply spray oil and wax spa-ringly and make sure to wipeoff any excess.● Never apply oil or wax to anyrubber and plastic parts, buttr

EWA10950ssWARNINGTo prevent damage or injury fromsparking, make sure to ground thespark plug electrodes while turningthe engine over.6. Lubricate all

DimensionsOverall lengthDT125RE 2210 mmDT125X 2139 mmOverall width795 mmOverall heightDT125RE 1200 mmDT125X 1121 mmSeat heightDT125RE 900 mmDT125X 886

5th22/23 (0.957)6th18/22 (0.818)ChassisFrame typeSemi double cradleCaster angleDT125RE 27.00 degreeDT125X 24.50 degreeTrailDT125RE 107.0 mmDT125X 73.1

Charging systemAC magnetoBatteryModelGT6B-3Voltage, capacity12 V, 6.0 AhHeadlightBulb typeHalogen bulbBulb voltage, wattage x quantityHeadlight12 V, 6

Front wheel ...6-26Rear wheel...6-28Troubleshooting ...

EAU26351Identification numbersRecord the key identification number,vehicle identification number andmodel label information in the spacesprovided belo

EAU26440Engine serial number1. Engine serial numberThe engine serial number is stampedinto the crankcase.EAU26480Model label1. Model labelThe model la

AAdjusting the autolube pump ...6-21Adjusting the brake lever free play ...6-16Adjusting the brake pedal position and free play

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YAMAHA MOTOR ESPAÑA, S.A.PRINTED IN SPAIN2004-07-Bengar Gràfiques, S.L.(E)1D0-F8199-E2.qxd 20/9/04 11:32 Página 74

EAU10310MOTORCYCLES ARE SINGLETRACK VEHICLES. THEIR SAFE USEAND OPERATION ARE DEPENDENTUPON THE USE OF PROPER RIDINGTECHNIQUES AS WELL AS THEEXPERTISE

• Always obey the speed limitand never travel faster thanwarranted by road and trafficconditions.• Always signal before turning orchanging lanes. Make