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1 OWNER S SERVICE MANUALMANUEL D ATELIER DU PROPRIETAIREFAHRER- UND WARTUNGSHANDBUCHMANUALE DI SERVIZIO DEL PROPRIETARIOYZ250YZ250F21SS-28199-33 PRINTED IN 1 !(E, F, G, H)PRINTED ON RECYCLED PAPER2015YZ250 YZ250F22015q Read this manual carefully before operating this Il convient de lire attentivement ce manuel avant la premi re utilisation du v Bitte lesen Sie diese Bedienungsanleitung sorgf ltig durch, bevor Sie das Fahrzeug in Betrieb Leggere attentamente questo manuale prima di utilizzare questo 12014/05/29 11:59:59Q Read this manual carefully before operating this vehicle. This manual should stay with this vehicle if it is Il convient de lire attentivement ce manuel avant la premi re utilisation du v hicule.

2 Le manuel doit tre remis avec le v hicule en cas de vente de ce Leggere attentamente questo manuale prima di utilizzare il veicolo. Questo manuale dovrebbe accompagnare il veicolo se viene Bitte lesen Sie diese Bedienungsanleitung sorgf ltig durch, bevor Sie das Fahrzeug in Betrieb nehmen. Diese Bedienungsanleitung muss, wenn das Fahrzeug verkauft wird, beim Fahrzeug 22014/05/29 12:00:01YZ250F2YZ250F220152015YZ250YZ250 1SS-28199-33-E01SS-28199-33-E0 OWNER S SERVICE MANUALOWNER S SERVICE MANUALRead this manual carefully before operating this this manual carefully before operating this 'S SERVICE manual 2014 by Yamaha Motor Co., Edition, June 2014 All rights reserved.

3 Any reprinting orunauthorized use without the written permission of Yamaha Motor Co., expressly in JapanFOREWORDINTRODUCTIONC ongratulations on your purchase of a Yamaha YZ series. This model is the culmination of Yamaha's vast ex-perience in the production of paceset-ting racing machines. It represents the highest grade of craftsmanship and reliability that have made Yama-ha a manual explains operation, in-spection, basic maintenance and tun-ing of your machine. If you have any questions about this manual or your machine, please contact your Yama-ha continually seeks advance-ments 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 machine and this manual .

4 If you have any questions concerning this manual , please consult your Yamaha READ THIS manual carefully AND COMPLETELY before operating THIS MA-CHINE. DO NOT ATTEMPT TO OP-ERATE THIS MACHINE UNTIL YOU HAVE ATTAINED A SATISFACTO-RY KNOWLEDGE OF ITS CON-TROLS AND operating FEATURES AND UNTIL YOU HAVE BEEN TRAINED IN SAFE AND PROPER RIDING TECHNIQUES. REGULAR INSPECTIONS AND CAREFUL MAINTENANCE, ALONG WITH GOOD RIDING SKILLS, WILL ENSURE THAT YOU SAFETY ENJOY THE CAPABILI-TIES AND THE RELIABILITY OF THIS manual INFORMATIONP articularly important information is distinguished in this manual by the following is the safety alert symbol. It is used to alert you to potential per-sonal injury hazards.

5 Obey all safe-ty messages that follow this symbol to avoid possible injury or death. A WARNING indicates a hazardous situation which, if not avoided, could result in death or serious in-jury. A NOTICE indicates special pre-cautions that must be taken to avoid damage to the vehicle or oth-er property. A TIP provides key information to make procedures easier or clearer. SAFETY INFORMATIONTHIS MACHINE IS DESIGNED STRICTLY FOR COMPETITION USE, ONLY ON A CLOSED COURSE. It is illegal for this machine to be operated on any public street, road, or highway. Off-road use on public lands may also be illegal. Please check local regulations before riding. THIS MACHINE IS TO BE OPER-ATED BY AN EXPERIENCED RID-ER not attempt to operate this ma-chine at maximum power until you are totally familiar with its character-istics.

6 THIS MACHINE IS DESIGNED TO BE RIDDEN BY THE OPERATOR not carry passengers on this machine. ALWAYS WEAR PROTECTIVE operating this machine, al-ways wear an approved helmet with goggles or a face shield. Also wear heavy boots, gloves, and protective clothing. Always wear proper fitting clothing that will not be caught in any of the moving parts or controls of the machine. ALWAYS MAINTAIN YOUR MA-CHINE IN PROPER WORKING safety and reliability, the ma-chine must be properly maintained. Always perform the pre-operation checks indicated in this manual . Correcting a mechanical problem before you ride may prevent an ac-cident. GASOLINE IS HIGHLY turn off the engine while re-fueling.

7 Take care to not spill any gasoline on the engine or exhaust system. Never refuel in the vicinity of an open flame, or while smoking. GASOLINE CAN CAUSE you should swallow some gaso-line, inhale excess gasoline vapors, or allow any gasoline to get into your eyes, contact a doctor immedi-ately. If any gasoline spills onto your skin or clothing, immediately wash skin areas with soap and wa-ter, and change your clothes. ONLY OPERATE THE MACHINE IN AN AREA WITH ADEQUATE start the engine or let it run for any length of time in an enclosed area. Exhaust fumes are poison-ous. These fumes contain carbon monoxide, which by itself is odor-less and colorless. Carbon monox-ide is a dangerous gas which can cause unconsciousness or can be lethal.

8 PARK THE MACHINE CAREFUL-LY; TURN OFF THE turn off the engine if you are going to leave the machine. Do not park the machine on a slope or soft ground as it may fall over. THE ENGINE, EXHAUST PIPE, MUFFLER, AND OIL TANK WILL BE VERY HOT AFTER THE EN-GINE HAS BEEN careful not to touch them or to allow any clothing item to contact them during inspection or repair. PROPERLY SECURE THE MA-CHINE before TRANSPORTING transporting the machine in another vehicle, always be sure it is properly secured and in an upright position and that the fuel cock is in the "OFF" position. Otherwise, fuel may leak out of the carburetor or fuel TO USE THIS MANUALFINDING THE REQUIRED PAGE1. This manual consists of seven chapters; "General Information", "Specifications", "Regular inspec-tion and adjustments", "Engine", "Chassis", "Electrical" and "Tun-ing"2.

9 The table of contents is at the be-ginning of the manual . Look over the general layout of the book be-fore finding then required chapter and item. Bend the book at its edge, as shown, to find the required fore edge symbol mark and go to a page for required item and FORMATAll of the procedures in this manual are organized in a sequential, step-by-step format. The information has been complied to provide the me-chanic with an easy to read, handy reference that contains comprehen-sive explanations of all disassembly, repair, assembly, and inspection op-erations. In this revised format, the condition of a faulty component will precede an arrow symbol and the course of ac-tion required will follow the symbol, , BearingsPitting/damage TO READ DESCRIPTIONSTo help identify parts and clarify pro-cedure steps, there are exploded dia-grams at the start of each removal and disassembly An easy-to-see exploded diagram "1" is provided for removal and disassembly Numbers "2" are given in the or-der of the jobs in the exploded di-agram.

10 A number that is enclosed by a circle indicates a disassem-bly An explanation of jobs and notes is presented in an easy-to-read way by the use of symbol marks "3". The meanings of the symbol marks are given on the next A job instruction chart "4" accom-panies the exploded diagram, providing the order of jobs, names of parts, notes in jobs, For jobs requiring more informa-tion, the step-by-step format sup-plements "5" are given in addition to the exploded diagram and job instruction SYMBOLS (Refer to the illustration)Illustrated symbols "1" to "7" are used to identify the specifications appear-ing in the engine value, Service ( ), Voltage (V), Electric current (A)Illustrated symbols "8" to "14" in the exploded diagrams indicate grade of lubricant and location of lubrication engine mixing transmission oil10.