2011 Yamaha GRIZZLY / 550 (2009-2011) / 700 FI 4WD (2009-2011) / EPS / HUNTER ATV Service Repair Maintenance Overhaul Manual

EAS20071 IMPORTANT This manual was produced by the Yamaha Motor Company, Ltd. primarily for use by Yamaha dealers and their qualified mechanics. It is not possible to include all the knowledge of a mechanic in one manual. Therefore, anyone who uses this book to perform maintenance and repairs on Yamaha vehicles should have a basic understanding of mechanics and the techniques to repair these types of vehicles. Repair and maintenance work attempted by anyone without this knowledge is likely to render the vehicle unsafe and unfit for use. This model has been designed and manufactured to perform within certain specifications in regard to performance and emissions. Proper service with the correct tools is necessary to ensure that the vehicle will operate as designed. If there is any question about a service procedure, it is imperative that you contact a Yamaha dealer for any service information changes that apply to this model. This policy is intended to provide the customer with the most satisfaction from his vehicle and to conform to federal environmental quality objectives. Yamaha Motor Company, Ltd. is continually striving to improve all of its models. Modifications and sig- nificant changes in specifications or procedures will be forwarded to all authorized Yamaha dealers and will appear in future editions of this manual where applicable. TIP • This Service Manual contains information regarding periodic maintenance to the emission control system. Please read this material carefully. • Designs and specifications are subject to change without notice. EAS20081 IMPORTANT MANUAL INFORMATION Particularly important information is distinguished in this manual by the following notations. This is the safety alert symbol. It is used to alert you to potential person- al injury hazards. Obey all safety 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 injury. A NOTICE indicates special precautions that must be taken to avoid damage to the vehicle or other property. A TIP provides key information to make procedures easier or clearer. WARNING NOTICE TIP

EAS20090 HOW TO USE THIS MANUAL This manual is intended as a handy, easy-to-read reference book for the mechanic. Comprehensive explanations of all installation, removal, disassembly, assembly, repair and check procedures are laid out with the individual steps in sequential order. • The manual is divided into chapters and each chapter is divided into sections. The current section title “1” is shown at the top of each page. • Sub-section titles “2” appear in smaller print than the section title. • To help identify parts and clarify procedure steps, there are exploded diagrams “3” at the start of each removal and disassembly section. • Numbers “4” are given in the order of the jobs in the exploded diagram. A number indicates a disassembly step. • Symbols “5” indicate parts to be lubricated or replaced. Refer to “SYMBOLS”. • A job instruction chart “6” accompanies the exploded diagram, providing the order of jobs, names of parts, notes in jobs, etc. • Jobs “7” requiring more information (such as special tools and technical data) are described sequen- tially. NOTICE 1 3 4 5 6 7 2

EAS20100 SYMBOLS The following symbols are used in this manual for easier understanding. TIP The following symbols are not relevant to every vehicle. G M E B LS M 9 10 11 12 13 14 15 16 17 18 LT New BF S T R . . 1 2 3 4 5 6 7 8 1. Serviceable with engine mounted 2. Filling fluid 3. Lubricant 4. Special tool 5. Tightening torque 6. Wear limit, clearance 7. Engine speed 8. Electrical data 9. Engine oil 10. Gear oil 11.Molybdenum disulfide oil 12. Brake fluid 13. Wheel bearing grease 14.Lithium-soap-based grease 15.Molybdenum disulfide grease 16. Silicone grease 17.Apply locking agent (LOCTITE®). 18.Replace the part with a new one.

EAS20110 TABLE OF CONTENTS GENERAL INFORMATION 1 SPECIFICATIONS 2 PERIODIC CHECKS AND ADJUSTMENTS 3 CHASSIS 4 ENGINE 5 COOLING SYSTEM 6 FUEL SYSTEM 7 DRIVE TRAIN 8 ELECTRICAL SYSTEM 9 TROUBLESHOOTING 10

1 GENERAL INFORMATION IDENTIFICATION ............................................................................................ 1-1 VEHICLE IDENTIFICATION NUMBER ..................................................... 1-1 MODEL LABEL.......................................................................................... 1-1 FEATURES ...................................................................................................... 1-2 OUTLINE OF THE FI SYSTEM ................................................................. 1-2 FI SYSTEM................................................................................................ 1-3 OUTLINE OF THE EPS (ELECTRIC POWER STEERING) SYSTEM (YFM5FGP/YFM7FGP only) ..................................................................... 1-5 EPS (ELECTRIC POWER STEERING) SYSTEM BLOCK DIAGRAM (YFM5FGP/YFM7FGP only) ..................................................................... 1-7 INSTRUMENT FUNCTIONS ..................................................................... 1-9 IMPORTANT INFORMATION ....................................................................... 1-11 PREPARATION FOR REMOVAL AND DISASSEMBLY......................... 1-11 REPLACEMENT PARTS......................................................................... 1-11 GASKETS, OIL SEALS AND O-RINGS .................................................. 1-11 LOCK WASHERS/PLATES AND COTTER PINS ................................... 1-11 BEARINGS AND OIL SEALS .................................................................. 1-12 CIRCLIPS ................................................................................................ 1-12 CHECKING THE CONNECTIONS ................................................................ 1-13 SPECIAL TOOLS .......................................................................................... 1-14

IDENTIFICATION 1-1 EAS20130 IDENTIFICATION EAS20140 VEHICLE IDENTIFICATION NUMBER The vehicle identification number “1” is stamped into the front left side of the frame. EAS20150 MODEL LABEL The model label “1” is affixed to the location shown in the illustration. This information will be needed to order spare parts.

FEATURES 1-2 EAS20170 FEATURES EAS28P1031 OUTLINE OF THE FI SYSTEM The main function of a fuel supply system is to provide fuel to the combustion chamber at the optimum air-fuel ratio in accordance with the engine operating conditions and the atmospheric temperature. In the conventional carburetor system, the air-fuel ratio of the mixture that is supplied to the combustion chamber is created by the volume of the intake air and the fuel that is metered by the jet used in the respective carburetor. Despite the same volume of intake air, the fuel volume requirement varies with the engine operating conditions, such as acceleration, deceleration, or operating under a heavy load. Carburetors that meter the fuel through the use of jets have been provided with various auxiliary devices, so that an optimum air-fuel ratio can be achieved to accommodate the constant changes in the operating conditions of the engine. As the requirements for the engine to deliver more performance and cleaner exhaust gases increase, it becomes necessary to control the air-fuel ratio in a more precise and finely tuned manner. To accommodate this need, this model has adopted an electronically controlled fuel injection (FI) system, in place of the conventional carburetor system. This system can achieve an optimum air-fuel ratio required by the engine at all times by using a microprocessor that regulates the fuel injection volume according to the engine operating conditions detected by various sensors. The adoption of the FI system has resulted in a highly precise fuel supply, improved engine response, better fuel economy, and reduced exhaust emissions. 1 2 3 4 67 8 9 10 11 12 13 14 15 5 1. ECU (engine control unit) 2. Lean angle sensor 3. Fuel injection system relay 4. Engine trouble warning light 5. ISC (idle speed control) unit 6. Intake air pressure sensor 7. TPS (throttle position sensor) 8. Intake air temperature sensor 9. Fuel injector 10. Fuel pump 11. Speed sensor 12. Crankshaft position sensor 13.Coolant temperature sensor 14. Spark plug 15. Ignition coil

FEATURES 1-3 EAS28P1032 FI SYSTEM The fuel pump delivers fuel to the fuel injector via the fuel filter. The pressure regulator maintains the fuel pressure that is applied to the fuel injector at only 324 kPa (3.24 kgf/cm², 46.1 psi). Accordingly, when the energizing signal from the ECU energizes the fuel injector, the fuel passage opens, causing the fuel to be injected into the intake manifold only during the time the passage remains open. There- fore, the longer the length of time the fuel injector is energized (injection duration), the greater the volume of fuel that is supplied. Conversely, the shorter the length of time the fuel injector is energized (injection duration), the lesser the volume of fuel that is supplied. The injection duration and the injection timing are controlled by the ECU. Signals that are input from the throttle position sensor, crankshaft position sensor, intake air pressure sensor, intake air temperature sensor, coolant temperature sensor, lean angle sensor and speed sensor enable the ECU to determine the injection duration. The injection timing is determined through the signals from the crankshaft position sensor. As a result, the volume of fuel that is required by the engine can be supplied at all times in accordance with the driving conditions. Illustration is for reference only. C 14 2 1 3 5 6 7 8 9 10 13 12 11 4 A B 1. Fuel pump 2. Fuel injector 3. Ignition coil 4. ECU (engine control unit) 5. Speed sensor 6. Lean angle sensor 7. Coolant temperature sensor 8. Crankshaft position sensor 9. Intake air pressure sensor 10.Throttle body 11.ISC (idle speed control) unit 12.Throttle position sensor 13.Intake air temperature sensor 14. Air filter case A. Fuel system B. Air system C. Control system

2011 Yamaha GRIZZLY / 550 (2009-2011) / 700 FI 4WD (2009-2011) / EPS / HUNTER ATV Service Repair Maintenance Overhaul Manual

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