OWNER'S MANUAL DT125R 3MB-28199-E7 INTRODUCTION 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 technology for the design and the manufacture of high-quality products, which have earned Yamaha a reputation for dependability. Please take the time to read this manual thoroughly, so as to enjoy all your DT125R's advantages. The owner's manual does not only instruct you in how to operate, inspect and maintain your motorcycle, but also in how to safeguard yourself and others from trouble and injury. In addition, the many tips given in this manual will help to keep your motorcycle in the best possible condition. If you have any further questions, do not hesitate to contact your Yamaha dealer. The Yamaha team wishes you many safe and pleasant rides. So, remember to put safety first! 1 2 4 5 6 7 8 9 IMPORTANT MANUAL INFORMATION EAU00005 Particularly important information is distinguished in this manual by the following notations: 1 2 3 4 5 NOTE: 6 7 8 9 NOTE: 8 This manual should be considered a permanent part of this motorcycle and should remain with it even if the motorcycle is subsequently sold. 8 Yamaha continually seeks advancements in product design and quality. Therefore, while this manual contains the most current product information available at the time of printing, there may be minor discrepancies between your motorcycle and this manual. If there is any question concerning this manual, please consult your Yamaha dealer. A NOTE provides key information to make procedures easier or clearer. Q w cC The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED! Failure to follow WARNING instructions could result in severe injury or death to the motorcycle operator, a bystander or a person inspecting or repairing the motorcycle. A CAUTION indicates special precautions that must be taken to avoid damage to the motorcycle. IMPORTANT MANUAL INFORMATION w EW000002 PLEASE READ THIS MANUAL CAREFULLY AND COMPLETELY BEFORE OPERATING THIS MOTORCYCLE. 1 2 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 EAU03337 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 in Japan. EAU00009 TABLE OF CONTENTS 1 2 GIVE SAFETY THE RIGHT OF WAY..................1-1 DESCRIPTION ....................................................2-1 Left view............................................................2-1 Right view .........................................................2-2 Controls/Instruments.........................................2-3 INSTRUMENT AND CONTROL FUNCTIONS ....3-1 Main switch .......................................................3-1 Indicator lights...................................................3-1 Oil level indicator circuit check..........................3-2 Speedometer ....................................................3-3 Tachometer.......................................................3-3 Engine temperature gauge ...............................3-4 Handlebar switches ..........................................3-4 Clutch lever .......................................................3-5 Shift pedal .........................................................3-5 Front brake lever...............................................3-6 Rear brake pedal ..............................................3-6 Fuel tank cap ....................................................3-6 Fuel (except for Switzerland and Austria) .........3-7 Fuel (for Switzerland and Austria) ....................3-7 Catalyzer (for Switzerland and Austria) ............3-8 Two-stroke engine oil........................................3-9 Fuel cock ..........................................................3-9 Starter (choke) "1".........................................3-10 Kick starter ......................................................3-11 Steering lock ...................................................3-11 Seat ................................................................3-12 Helmet holder .................................................3-12 Rear shock absorber adjustment ....................3-13 Rear carrier .....................................................3-14 Note on handling of the Yamaha Energy Induction System (Y.E.I.S.).............................3-14 Y.P.V.S. (Yamaha Power Valve System) ......................3-15 Sidestand ........................................................3-15 Sidestand switch operation check ..................3-16 1 2 3 4 5 6 7 8 9 3 4 PRE-OPERATION CHECKS ...............................4-1 Pre-operation check list ....................................4-1 OPERATION AND IMPORTANT RIDING POINTS................................................................5-1 Starting the engine............................................5-1 Starting a warm engine .....................................5-3 Shifting ..............................................................5-4 Recommended shift points (for Switzerland only) ........................................5-4 Tips for reducing fuel consumption ...................5-5 Engine break-in.................................................5-5 Parking..............................................................5-6 5 TABLE OF CONTENTS 6 1 2 3 4 5 6 7 8 9 PERIODIC MAINTENANCE AND MINOR REPAIR................................................................6-1 Tool kit ..............................................................6-1 Periodic maintenance and lubrication chart ......6-3 Cowling removal and installation ......................6-6 Cowling A..........................................................6-6 Cowling B..........................................................6-7 Cowling C .........................................................6-8 Panel removal and installation ..........................6-8 Panel D .............................................................6-9 Panel E .............................................................6-9 Spark plug.......................................................6-10 Transmission oil ..............................................6-11 Cooling system ...............................................6-12 Changing the coolant ......................................6-13 Air filter............................................................6-15 Carburetor adjustment ....................................6-16 Idle speed adjustment.....................................6-17 Throttle cable free play adjustment.................6-17 Tires ................................................................6-18 Wheels ............................................................6-20 Clutch lever free play adjustment ...................6-21 Front brake lever free play adjustment ...........6-21 Rear brake pedal height adjustment ...............6-22 Brake light switch adjustment .........................6-23 Checking the front and rear brake pads .........6-23 Inspecting the brake fluid level .......................6-24 Brake fluid replacement ..................................6-25 Drive chain slack check ..................................6-25 Drive chain slack adjustment ..........................6-26 Drive chain lubrication ....................................6-26 Cable inspection and lubrication .....................6-27 Throttle cable and grip lubrication...................6-27 Autolube pump adjustment .............................6-28 Brake and shift pedal lubrication.....................6-28 Brake and clutch lever lubrication ...................6-28 Sidestand lubrication ......................................6-29 Front fork inspection .......................................6-29 Steering inspection .........................................6-30 Wheel bearings ...............................................6-30 Battery ............................................................6-31 Fuse replacement ...........................................6-33 Headlight bulb replacement ............................6-33 Turn signal light bulb replacement ..................6-35 Tail/brake light bulb replacement ....................6-35 Supporting the motorcycle ..............................6-36 Front wheel removal .......................................6-36 Front wheel installation ...................................6-37 Rear wheel removal ........................................6-38 Rear wheel installation....................................6-39 Troubleshooting ..............................................6-39 Troubleshooting chart .....................................6-40 TABLE OF CONTENTS 7 MOTORCYCLE CARE AND STORAGE .............7-1 Care ..................................................................7-1 Storage .............................................................7-4 SPECIFICATIONS ...............................................8-1 How to use the conversion table.......................8-5 CONSUMER INFORMATION..............................9-1 Identification number records ...........................9-1 Key identification number .................................9-1 Vehicle identification number ............................9-1 Model label .......................................................9-2 1 2 3 4 5 6 7 8 9 8 9 Q GIVE SAFETY THE RIGHT OF WAY EAU00021 1 2 3 4 5 6 7 8 9 Motorcycles are fascinating vehicles, which can give you an unsurpassed feeling of power and freedom. However, they also impose certain limits, which you must accept; even the best motorcycle does not ignore the laws of physics. Regular care and maintenance are essential for preserving your motorcycle's value and operating condition. Moreover, what is true for the motorcycle is also true for the rider: good performance depends on being in good shape. Riding under the influence of medication, drugs and alcohol is, of course, out of the question. Motorcycle riders - more than car drivers - must always be at their mental and physical best. Under the influence of even small amounts of alcohol, there is a tendency to take dangerous risks. Protective clothing is as essential for the motorcycle rider as seat belts are for car drivers and passengers. Always wear a complete motorcycle suit (whether made of leather or tear-resistant synthetic materials with protectors), sturdy boots, motorcycle gloves and a properly fitting helmet. Optimum protective wear, however, should not encourage carelessness. Though full-coverage helmets and suits, in particular, create an illusion of total safety and protection, motorcyclists will always be vulnerable. Riders who lack critical self-control run the risk of going too fast and are apt to take chances. This is even more dangerous in wet weather. The good motorcyclist rides safely, predictably and defensively - avoiding all dangers, including those caused by others. Enjoy your ride! 1-1 EAU00026 DESCRIPTION Left view 1 2 3 4 5 6 7 1 23 4 5 6 10 8 9 1. 2. 3. 4. 5. 6. Headlight Radiator cap Fuel cock Air filter Coolant reservoir tank Helmet holder (page 6-33) (page 6-13) (page 3-9) (page 6-15) (page 6-13) (page 3-12) 98 7. 8. 9. 10. 7 Starter (choke) Shift pedal Y.E.I.S. Y.P.V.S. (page 3-10) (page 3-5, 5-4) (page 3-14) (page 3-15) 2-1 DESCRIPTION Right view 11 12 13 1 2 3 4 5 6 7 15 14 8 11. 12. 13. 14. 15. Tool kit Fuse Engine oil tank Rear brake pedal Rear shock absorber spring preload adjusting nut (page 6-1) (page 6-33) (page 3-9) (page 3-6, 6-22) (page 3-13) 2-2 9 DESCRIPTION Controls/Instruments 16 1 2 3 4 5 6 7 8 9 17 18 19 20 21 22 25 16. 17. 18. 19. 20. Clutch lever Left handlebar switches Speedometer Coolant temperature gauge Tachometer (page 3-5, 6-21) (page 3-4) (page 3-3) (page 3-4) (page 3-3) 24 21. 22. 23. 24. 25. 2-3 23 Right handlebar switches Front brake lever Throttle grip Fuel tank cap Main switch (page 3-5) (page 3-6, 6-27) (page 6-17, 6-27) (page 3-6) (page 3-1) EAU00027 INSTRUMENT AND CONTROL FUNCTIONS EAU00063 ON OFF 4 123 High beam indicator light "&" This indicator comes on when the headlight high beam is used. EAU01313 1 2 3 4 5 6 7 8 9 EAU00028 Main switch The main switch controls the ignition and lighting systems. Its operation is described below. EAU00036 1. 2. 3. 4. Turn indicator light "5" High beam indicator light "&" Neutral indicator light "N" Oil level indicator light "7" EAU00056 Oil level indicator light "7" This indicator comes on when the oil level is low. This light circuit can be checked by the procedure on page 32. cC EC000000 Indicator lights EAU00057 Do not run the motorcycle until you know it has sufficient engine oil. NOTE Even if the oil is filled to the specified level, the indicator light may flicker when riding on a slope or during sudden acceleration or deceleration, but this is normal. ON Electrical circuits ar ...