YAMAHA DT125R Owner's Manual

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[Page 1] Yamaha DT125R

PRINTED ON RECYCLED PAPER PRINTED IN JAPAN 2000·12–0.4×1(E) ! OWNER’S MANUAL 3MB-28199-E7 DT125R YAMAHA MOTOR CO., LTD. ...

[Page 2] Yamaha DT125R

INTRODUCTION 1 2 4 5 6 7 8 9 EAU00001 Welcome to the Yamaha world of motorcycling! As the owner of a DT125R, you are benefiting from Yamaha’s vast experience in and newest tech- nology for the design and the manufacture of high-quality products, wh...

[Page 3] Yamaha DT125R

IMPORTANT MANUAL INFORMATION 1 2 3 4 5 6 7 8 9 EAU00005 Particularly important information is distinguished in this manual by the following notations: The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED! Failure to follow W...

[Page 4] Yamaha DT125R

IMPORTANT MANUAL INFORMATION 1 2 4 5 6 7 8 9 EW000002 w PLEASE READ THIS MANUAL CAREFULLY AND COMPLETELY BEFORE OPERATING THIS MOTORCYCLE. 3MB-9-E7 12/27/00 2:52 PM Page 3 ...

[Page 5] Yamaha DT125R

1 2 3 4 5 6 7 8 9 DT125R OWNER’S MANUAL © 2000 by Yamaha Motor Co., Ltd. 1st Edition, December 2000 All rights reserved. Any reprinting or unauthorized use without the written permission of Yamaha Motor Co., Ltd. is expressly prohibited. Printed i...

[Page 6] Yamaha DT125R

EAU00009 TABLE OF CONTENTS 1 2 3 4 5 6 7 8 9 GIVE SAFETY THE RIGHT OF WAY..................1-1 DESCRIPTION ....................................................2-1 Left view............................................................2-1 Right view ......

[Page 7] Yamaha DT125R

PERIODIC MAINTENANCE AND MINOR REPAIR................................................................6-1 Tool kit ..............................................................6-1 Periodic maintenance and lubrication chart......6-3 Cowling removal an...

[Page 8] Yamaha DT125R

TABLE OF CONTENTS 1 2 3 4 5 6 7 8 9 MOTORCYCLE CARE AND STORAGE .............7-1 Care ..................................................................7-1 Storage .............................................................7-4 SPECIFICATIONS..........

[Page 9] Yamaha DT125R

1-1 Motorcycles are fascinating vehicles, which can give you an unsurpassed feeling of power and free- dom. However, they also impose certain limits, which you must accept; even the best motorcycle does not ignore the laws of physics. Regular care an...

[Page 10] Yamaha DT125R

3MB-9-E7 12/27/00 2:52 PM Page 9 ...

[Page 11] Yamaha DT125R

EAU00026 DESCRIPTION 1 2 3 4 5 6 7 8 9 2-1 1 23 4 5 6 7 8 910 Left view 1. Headlight (page 6-33) 2. Radiator cap (page 6-13) 3. Fuel cock (page 3-9) 4. Air filter (page 6-15) 5. Coolant reservoir tank (page 6-13) 6. Helmet holder (page 3-12) ...

[Page 12] Yamaha DT125R

DESCRIPTION 1 2 3 4 5 6 7 8 9 2-2 11 12 13 1415 Right view 11. Tool kit (page 6-1) 12. Fuse (page 6-33) 13. Engine oil tank (page 3-9) 14. Rear brake pedal (page 3-6, 6-22) 15. Rear shock absorber spring preload adjusting nut (page 3-13) 3MB...

[Page 13] Yamaha DT125R

1 2 3 4 5 6 7 8 9 DESCRIPTION 2-3 16. Clutch lever (page 3-5, 6-21) 17. Left handlebar switches (page 3-4) 18. Speedometer (page 3-3) 19. Coolant temperature gauge (page 3-4) 20. Tachometer (page 3-3) 21. Right handlebar switches (page 3-5) 22....

[Page 14] Yamaha DT125R

3-1 ON OFF EAU00028 Main switch The main switch controls the ignition and lighting systems. Its operation is described below. EAU00036 ON Electrical circuits are switched on. The engine can be started. The key cannot be removed in this position. EA...

[Page 15] Yamaha DT125R

EAU00075 Oil level indicator circuit check 3-2 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 Turn the main switch to “ON”. Put the transmission in neutral. Oil level indicator light does not come on. Ask a Yamaha dealer to inspect electrical...

[Page 16] Yamaha DT125R

3-3 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 1 2 1. Tachometer 2. Red zone EAU00102 Tachometer This model is equipped with a tachometer so the rider can monitor the engine speed and keep it within the ideal power range. EC000003 cC Do not...

[Page 17] Yamaha DT125R

3-4 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 EAU00127 Turn signal switch To signal a right-hand turn, push the switch to “6”. To signal a left-hand turn, push the switch to “4”. Once the switch is released it will return to the cent...

[Page 18] Yamaha DT125R

3-5 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 1 1. Engine stop switch EAU00138 Engine stop switch The engine stop switch is a safety device for use in an emergency such as when the motorcycle overturns or if trouble occurs in the throttle ...

[Page 19] Yamaha DT125R

3-6 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 1 1. Front brake lever EAU00158 Front brake lever The front brake lever is located on the right handlebar. Pull it toward the handlebar to apply the front brake. 1 1. Rear brake pedal EAU0016...

[Page 20] Yamaha DT125R

3-7 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 NOTE: The tank cap cannot be reinstalled unless it is unlocked. The key must remain in the cap until the cap is properly installed and locked onto the fuel tank. EW000023 w Be sure the cap is pro...

[Page 21] Yamaha DT125R

3-8 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 EW000130 w Do 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 an...

[Page 22] Yamaha DT125R

3-9 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 EC000114 cC The following must be observed to prevent a fire hazard or other dam- ages. 88 Use only unleaded gasoline. Use of leaded gasoline will cause unrepairable damage to the catalytic conve...

[Page 23] Yamaha DT125R

3-10 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 ON FUEL RES OFF 1 ON 1. Arrow mark positioned “ON” ON With the lever in this position, fuel flows to the carburetor. Normal riding is done with the lever in this position. ON: normal posit...

[Page 24] Yamaha DT125R

3-11 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 1 EAU00212 Kick starter Rotate 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...

[Page 25] Yamaha DT125R

3-12 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 To install 1. Insert the projections on the front of the seat into the holders, then tighten the seat bolts. 2. Install the panels. NOTE: Make sure that the seat is securely fitted. 1 EAU00261...

[Page 26] Yamaha DT125R

3-13 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 b a 2 1 EAU01650 Rear shock absorber adjustment This shock absorber is equipped with a spring preload adjuster. Adjust spring preload as follows. 1. Loosen the locknut. 2. Turn the adjusting n...

[Page 27] Yamaha DT125R

3-14 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 1 2 1. Air chamber 2. Hose EAU00325 Note on handling of the Yamaha Energy Induction System (Y.E.I.S.) Handle the air chamber and hose with special care. Improper installa- tion or damaged par...

[Page 28] Yamaha DT125R

3-15 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 EC000023 cC The 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 m...

[Page 29] Yamaha DT125R

EW000045 w If improper operation is noted, consult a Yamaha dealer immedi- ately. 3-16 INSTRUMENT AND CONTROL FUNCTIONS 1 2 3 4 5 6 7 8 9 ENGINE WILL STALL. SIDESTAND SWITCH IS OK. EAU00333 Sidestand switch operation check Check the operation of the ...

[Page 30] Yamaha DT125R

4-1 EAU01114 PRE-OPERATION CHECKS 1 2 3 4 5 6 7 8 9 Owners are personally responsible for their vehicle’s condition. Your motorcycle’s vital functions can start to deteriorate quickly and unexpectedly, even if it remains unused (for instance, if ...

[Page 31] Yamaha DT125R

4-2 PRE-OPERATION CHECKS 1 2 3 4 5 6 7 8 9 ITEM CHECKS PAGE Brake and shift pedal shafts 9 Check for smooth operation. 6-28 9 Lubricate if necessary. Brake and clutch lever pivots 9 Check for smooth operation. 9 Lubricate if necessary. Sidestand pivo...

[Page 32] Yamaha DT125R

5-1 1 2 3 4 5 6 7 8 9 EAU00373 w 88 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. 88 Never s...

[Page 33] Yamaha DT125R

5-2 OPERATION AND IMPORTANT RIDING POINTS 1 2 3 4 5 6 7 8 9 IF TRANSMISSION IS IN NEUTRAL AND SIDESTAND IS DOWN, KICK THE KICK STARTER. ENGINE WILL START. RETRACT SIDESTAND AND PUT TRANSMISSION IN GEAR. MOTORCYCLE CAN BE RIDDEN.MOTORCYCLE CAN BE RID...

[Page 34] Yamaha DT125R

5-3 OPERATION AND IMPORTANT RIDING POINTS 1 2 3 4 5 6 7 8 9 1. Turn the fuel cock to “ON”. 2. Turn the main switch to “ON” and the engine stop switch to “#”. 3. Shift the transmission into neu- tral. NOTE: When the transmission is in neut...

[Page 35] Yamaha DT125R

5-4 OPERATION AND IMPORTANT RIDING POINTS 1 2 3 4 5 6 7 8 9 EAU00423 Shifting The transmission lets you control the amount of power you have available at a given speed for starting, acceler- ating, climbing hills, etc. The use of the shift pedal is s...

[Page 36] Yamaha DT125R

5-5 OPERATION AND IMPORTANT RIDING POINTS 1 2 3 4 5 6 7 8 9 EAU00424 Tips for reducing fuel consumption Your motorcycle’s fuel consumption depends to a large extent on your rid- ing style. The following tips can help reduce fuel consumption: 8 War...

[Page 37] Yamaha DT125R

1,000 km and beyond Full throttle can be used. EC000053 cC 88 Never let engine speeds enter the red zone. 88 If any engine trouble should occur during the break-in peri- od, consult a Yamaha dealer immediately. EAU00458 Parking When parking the motor...

[Page 38] Yamaha DT125R

6-1 EAU00462 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU00464 Periodic inspection, adjustment and lubrication will keep your motorcycle in the safest and most efficient condi- tion possible. Safety is an obligation of the motorcycle o...

[Page 39] Yamaha DT125R

6-2 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 NOTE: If you do not have necessary tools required during a service operation, take your motorcycle to a Yamaha dealer for service. EW000063 w Modifications to this motorcycle not approved by...

[Page 40] Yamaha DT125R

6-3 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU03686 Periodic maintenance and lubrication chart NOTE: 8 The annual checks must be performed every year, except if a kilometer-based maintenance is performed instead. 8 From 30,000 km, re...

[Page 41] Yamaha DT125R

6-4 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 9 * Wheels • Check runout, spoke tightness and for damage. • Tighten spokes if necessary. √ √ √ √ 10 * Tires • Check tread depth and for damage. • Replace if necessary. • ...

[Page 42] Yamaha DT125R

6-5 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU03884 NOTE: 8 The air filter needs more frequent service if you are riding in unusually wet or dusty areas. 8 Hydraulic brake service 9 Regularly check and, if necessary, correct the brak...

[Page 43] Yamaha DT125R

6-6 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 1 2 1 1 EAU01065 Cowling removal and installation The cowlings indicated in the illustra- tion need to be removed to perform some of the maintenance described in this chapter. Refer to thi...

[Page 44] Yamaha DT125R

6-7 PERIODIC MAINTENANCE AND MINOR REPAIR 6 1 1. Screw (×3) EAU01534* Cowling B To remove Remove the screws and pull outward as shown. To install Place in the original position and install the screws. To install Place in the original position and ...

[Page 45] Yamaha DT125R

6-8 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 1 1 EAU01534* Cowling C To remove Remove the screws and pull outward as shown. 1. Screw (×3) 1. Panel D To install Place in the original position and install the screws. EAU01122 Panel re...

[Page 46] Yamaha DT125R

6-9 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 1 1 1 Refer to this section each time a panel has to be removed or rein- stalled. EAU01535* Panel D To remove Remove the screw and pull outward as shown. To install Place the panel in the ...

[Page 47] Yamaha DT125R

6-10 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 1 EAU01833 Spark plug Removal 1. Remove the spark plug cap. 2. Use the spark plug wrench in the tool kit to remove the spark plug as shown. Inspection The spark plug is an important engin...

[Page 48] Yamaha DT125R

6-11 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 Spark plug gap: 0.7 ~ 0.8 mm Tightening torque: Spark plug: 20 Nm (2.0 m0kg) 1 3 2 EAU03109 Transmission oil Oil level inspection 1. Place the motorcycle on a level place and hold it in an ...

[Page 49] Yamaha DT125R

6-12 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 5. Fill the engine with sufficient oil to reach the specified level. Install the oil filler cap and tight- en it. EC000079 cC Do not put in any chemical addi- tives. Transmission oil also l...

[Page 50] Yamaha DT125R

6-13 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU01808 Cooling system 1. Remove panel D. (See page 6-9 for panel removal and installation procedures.) 2. Check the coolant level in the reservoir tank when the engine is cold as the cool...

[Page 51] Yamaha DT125R

6-14 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 8. Install the reservoir tank hose. 9. Pour the recommended coolant into the radiator until it is full. Recommended antifreeze: High quality ethylene glycol antifreeze containing corrosio...

[Page 52] Yamaha DT125R

6-15 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EC000080 cC Hard water or salt water is harmful to the engine. You may use dis- tilled water if you can’t get soft water. 10. Install the radiator cap. 11. Run the engine several minutes....

[Page 53] Yamaha DT125R

6-16 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 6. Insert the air filter guide into the air filter and install it in the case. 7. Install the air filter case cover and panel by installing the screws. EC000082 cC 88 Make sure the air filt...

[Page 54] Yamaha DT125R

6-17 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 b a 1 EAU00632 Idle speed adjustment 1. Start the engine and warm it up for a few minutes at approxi- mately 1,000 to 2,000 r/min. Occasionally rev the engine to 4,000 to 5,000 r/min. The...

[Page 55] Yamaha DT125R

6-18 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU00652 Tires To ensure maximum performance, long service and safe operation, note the following: Tire air pressure Always check and adjust the tire pressure before operating the motor- cy...

[Page 56] Yamaha DT125R

6-19 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EW000083 w Proper loading of your motorcycle is important for several character- istics of your motorcycle, such as handling, braking, performance and safety. Do not carry loosely packed it...

[Page 57] Yamaha DT125R

6-20 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU00685 Wheels To ensure maximum performance, long service, and safe operation, note the following: 8 Always inspect the wheels before a ride. Check for cracks, bends or warpage of the whe...

[Page 58] Yamaha DT125R

6-21 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 3 1 2 b a EAU00694 Clutch lever free play adjustment The clutch lever free play should be adjusted to 10 ~ 15 mm. 1. Loosen the locknut at the clutch lever. 2. Turn the adjusting bolt at ...

[Page 59] Yamaha DT125R

6-22 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EW000099 w 88 Check the brake lever free play. Be sure the brake is working properly. 88 A soft or spongy feeling in the brake lever can indicate the presence of air in the brake system. Th...

[Page 60] Yamaha DT125R

6-23 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU00713 Brake light switch adjustment The rear brake light switch is activat- ed by the brake pedal and is properly adjusted when the brake light comes on just before braking takes effect....

[Page 61] Yamaha DT125R

6-24 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 8 Use only the designated quality brake fluid. Otherwise, the rub- ber seals may deteriorate, caus- ing leakage and poor brake per- formance. NOTE: If DOT 4 is not available, DOT 3 can be u...

[Page 62] Yamaha DT125R

6-25 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU00742 Brake fluid replacement The brake fluid should be replaced only by trained Yamaha service per- sonnel. Have the Yamaha dealer replace the following components during periodic maint...

[Page 63] Yamaha DT125R

6-26 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EC000096 cC Too little chain slack will overload the engine and other vital parts. Keep the slack within the specified limits. 3. Tighten the wheel axle nut to the specified torque. EAU0153...

[Page 64] Yamaha DT125R

6-27 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EC000097 cC Be sure to oil the chain after wash- ing the motorcycle or riding in the rain. EAU02962 Cable inspection and lubrication EW000112 w Damage to the outer housing of cables may le...

[Page 65] Yamaha DT125R

6-28 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU00774 Autolube pump adjustment The autolube pump is a vital part of the engine and requires very sophisti- cated adjustment. Adjusting should be left to a Yamaha dealer who has the profe...

[Page 66] Yamaha DT125R

6-29 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU02986 Sidestand lubrication Lubricate the sidestand pivoting point and metal-to-metal contact surfaces. Check that the sidestand moves up and down smoothly. EW000113 w If the sidestand d...

[Page 67] Yamaha DT125R

6-30 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU00794 Steering inspection Periodically inspect the condition of the steering. Worn out or loose steer- ing bearings may be dangerous. Place a stand under the engine to raise the front wh...

[Page 68] Yamaha DT125R

6-31 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU01071 Battery Check the level of the battery elec- trolyte and make sure that the termi- nals are tight. Fill with distilled water if the elec- trolyte level is low. 1. Battery 2. Batter...

[Page 69] Yamaha DT125R

6-32 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 Replenishing the battery fluid A poorly maintained battery will cor- rode and discharge quickly. The bat- tery fluid should be checked at least once a month. The level should be between the...

[Page 70] Yamaha DT125R

6-33 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU00804 Fuse replacement If the fuse is blown, turn off the main switch and the switch of the circuit in question. Install a new fuse of speci- fied amperage. Turn on the switches and see ...

[Page 71] Yamaha DT125R

6-34 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 3. Remove the headlight connector and the bulb holder cover. 4. Turn the bulb holder counter- clockwise to remove it and then remove the defective bulb. EW000119 w Keep flammable products a...

[Page 72] Yamaha DT125R

6-35 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 1 2 3 1 2 3 1. Screw (×2) 2. Lens 3. Bulb 1. Screw 2. Lens 3. Bulb EAU01095 Turn signal light bulb replacement 1. Remove the screw and the lens. 2. Remove the defective bulb by pushing i...

[Page 73] Yamaha DT125R

6-36 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 1 2 2 1. Disc cover 2. Screw (×2) EAU00898 Front wheel removal EW000122 w 88 It is advisable to have a Yamaha dealer service the wheel. 88 Securely support the motorcy- cle so there is n...

[Page 74] Yamaha DT125R

6-37 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 3 2 1 3. Elevate the front wheel by plac- ing a suitable stand under the engine. 4. Loosen the wheel axle holder nuts. 5. Remove the wheel axle and the front wheel. Make sure the motorcyc...

[Page 75] Yamaha DT125R

6-38 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 1 1 1. Swingarm end bolt (×2) EAU03105 Rear wheel removal EW000122 w 88 It is advisable to have a Yamaha dealer service the wheel. 88 Securely support the motorcy- cle so there is no dan...

[Page 76] Yamaha DT125R

6-39 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU03106 Rear wheel installation 1. Install the rear wheel and chain. Guide the brake disc between the brake pads. Make sure there is enough gap between the brake pads before inserting the ...

[Page 77] Yamaha DT125R

6-40 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 EAU03108 Troubleshooting charts EW000125 w Never check the fuel system while smoking or in the vicinity of an open flame. Check if there is fuel 1. Fuel Enough fuel. No fuel. Go to compres...

[Page 78] Yamaha DT125R

6-41 PERIODIC MAINTENANCE AND MINOR REPAIR 1 2 3 4 5 6 7 8 9 4. Engine overheating EW000070 w Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be blown out under pressure, which could cause serious...

[Page 79] Yamaha DT125R

7-1 EAU01518 MOTORCYCLE CARE AND STORAGE 1 2 3 4 5 6 7 8 9 Care The exposure of its technology makes a motorcycle charming but also vulnerable. Although high-quality components are used, they are not all rust-resistant. While a rusty exhaust pipe may...

[Page 80] Yamaha DT125R

7-2 MOTORCYCLE CARE AND STORAGE 1 2 3 4 5 6 7 8 9 88 Improper cleaning can damage windshields, cowlings, panels and other plastic parts. Use only a soft, clean cloth or sponge with mild detergent and water to clean plastic. 88 Do not use any harsh ch...

[Page 81] Yamaha DT125R

7-3 MOTORCYCLE CARE AND STORAGE 1 2 3 4 5 6 7 8 9 After cleaning 1. Dry the motorcycle with a chamois or an absorbing cloth. 2. Immediately dry the drive chain and lubricate it to prevent it from rusting. 3. Use a chrome polish to shine chrome, alumi...

[Page 82] Yamaha DT125R

7-4 MOTORCYCLE CARE AND STORAGE 1 2 3 4 5 6 7 8 9 Storage Short-term Always store your motorcycle in a cool, dry place and, if necessary, pro- tect it against dust with a porous cover. ECA00014 cC 88 Storing the motorcycle in a poorly ventilated room...

[Page 83] Yamaha DT125R

7-5 MOTORCYCLE CARE AND STORAGE 1 2 3 4 5 6 7 8 9 6. Lubricate all control cables and the pivoting points of all levers and pedals as well as of the sidestand/centerstand. 7. Check and, if necessary, correct the tire air pressure, then raise the moto...

[Page 84] Yamaha DT125R

8-1 1 2 3 4 5 6 7 8 9 EAU01038 SPECIFICATIONS Specifications Model DT125R Dimensions Overall length 2,170 mm 2,235 mm (N, S, SF, CH, A only) Overall width 830 mm Overall height 1,255 mm Seat height 885 mm Wheel base 1,415 mm Ground clearance 315 mm M...

[Page 85] Yamaha DT125R

SPECIFICATIONS 8-2 1 2 3 4 5 6 7 8 9 Carburetor Type × quantity TM28SS × 1 Manufacturer MIKUNI Spark plug Manufacturer / type NGK / BR9ES NGK / BR8ES (CH, A only) Spark plug gap 0.7 ~ 0.8 mm Clutch type Wet, multiple-disc Transmission Primary reduc...

[Page 86] Yamaha DT125R

8-3 1 2 3 4 5 6 7 8 9 SPECIFICATIONS 90 kg load ~ maximum load* Front 150 kPa (1.50 kg/cm 2 , 1.50 bar) Rear 175 kPa (1.75 kg/cm 2 , 1.75 bar) Off-road riding Front 125 kPa (1.25 kg/cm 2 , 1.25 bar) Rear 150 kPa (1.50 kg/cm 2 , 1.50 bar) * Load is to...

[Page 87] Yamaha DT125R

SPECIFICATIONS 1 2 3 4 5 6 7 8 9 8-4 Battery Type GM3-3B Voltage, capacity 12 V, 3 AH Headlight type Conventional incandescent bulb Bulb voltage, wattage × quantity Headlight 12 V, 45/40 W × 1 Tail / Brake light 12 V, 5/21 W × 1 Front flasher ligh...

[Page 88] Yamaha DT125R

8-5 1 2 3 4 5 6 7 8 9 SPECIFICATIONS EAU01064 HOW TO USE THE CONVERSION TABLE All specification data in this manual are listed in SI and METRIC UNITS. Use this table to convert METRIC unit data to IMPERIAL unit data. Ex. METRIC MULTIPLIER IMPERIAL *...

[Page 89] Yamaha DT125R

1 2 3 4 5 6 7 8 9 9-1 EAU01039 CONSUMER INFORMATION 1 1 EAU02944 Identification number records Record the key identification number, vehicle identification number and model label information in the spaces provided for assistance when order- ing spa...

[Page 90] Yamaha DT125R

9-2 CONSUMER INFORMATION 1 2 3 4 5 6 7 8 9 1 EAU01049 Model label The model label is affixed to the loca- tion shown in the figure. Record the information on this label in the space provided. This information will be needed to order spare parts fro...

[Page 91] Yamaha DT125R

PRINTED ON RECYCLED PAPER PRINTED IN JAPAN 2000·12–0.4×1(E) ! OWNER’S MANUAL 3MB-28199-E7 DT125R YAMAHA MOTOR CO., LTD. ...