User manual YAMAHA DT125R-2002

[. . . ] OWNER'S MANUAL DT125R 3MB-28199-E8 EAU03338 INTRODUCTION Welcome to the Yamaha world of motorcycling!As the owner of a DT125R, you are benefiting from Yamaha's vast experience and newest technology regarding the design and 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 advantages of your DT125R. 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. [. . . ] Do not attempt to diagnose such problems yourself. Instead, have a Yamaha dealer check the motorcycle. Check the spark plug for electrode erosion and excessive carbon or other deposits, and replace it if necessary. Specified spark plug: BR9ES (NGK) BR8ES (NGK) (CH, A only) 1. Spark plug wrench Checking the spark plug 6 The spark plug is an important engine component, which is easy to check. Since heat and deposits will cause any spark plug to slowly erode, the spark plug should be removed and checked in accordance with the periodic maintenance and lubrication chart. In addition, the condition of the spark plug can reveal the condition of the engine. Remove the spark plug as shown, with the spark plug wrench included in the owner's tool kit. 6-9 PERIODIC MAINTENANCE AND MINOR REPAIR EAU04272 Tightening torque: Spark plug: 20 Nm (2. 0 m0kgf) NOTE: If a torque wrench is not available when installing a spark plug, a good estimate of the correct torque is 1/4­1/2 turn past finger tight. However, the spark plug should be tightened to the specified torque as soon as possible. Install the spark plug cap. Transmission oil The transmission oil level should be checked before each ride. In addition, the transmission oil must be changed at the intervals specified in the periodic maintenance and lubrication chart. Place the motorcycle on a level surface and hold it in an upright position. NOTE: Make sure that the motorcycle is positioned straight up when checking the oil level. A slight tilt to the side can result in a false reading. Start the engine, warm it up for several minutes, and then turn it off. Spark plug gap To install the spark plug 1. Measure the spark plug gap with a wire thickness gauge and, if necessary, adjust the gap to specification. Clean the surface of the spark plug gasket and its mating surface, and then wipe off any grime from the spark plug threads. Install the spark plug with the spark plug wrench, and then tighten it to the specified torque. 6-10 PERIODIC MAINTENANCE AND MINOR REPAIR 1 1 2 1 1. Wait a few minutes until the oil settles, and then check the oil level through the check window located at the right side of the crankcase. NOTE: The transmission oil should be at or above the minimum level mark. If the oil is below the minimum level mark, remove the oil filler cap, add sufficient oil of the recommended type to raise it to the correct level, and then install and tighten the cap. To change the transmission oil 1. [. . . ] Turn the engine over several times with the starter. (This will coat the cylinder wall with oil. ) e. Remove the spark plug cap from the spark plug, and then install the spark plug and the spark plug cap. cC ECA00014 7 8 Storing the motorcycle in a poorly ventilated room or covering it with a tarp, while it is still wet, will allow water and humidity to seep in and cause rust. 8 To prevent corrosion, avoid damp cellars, stables (because of the presence of ammonia) and areas where strong chemicals are stored. w EWA00003 To prevent damage or injury from sparking, make sure to ground the spark plug electrodes while turning the engine over. 7-4 MOTORCYCLE CARE AND STORAGE 6. [. . . ]