Yamaha FJR1300R Service Manual

Also see for FJR1300: Owner's manual Owner's manual Owner's manual Owner's manual Owner's manual

Contents

1 - 2GENINFOFEATURESFEATURESOUTLINEThe main function of a fuel supply system is to provide fuel to the combustion chamber at the opti-mum air-fuel ratio in accordance with the engine operating conditions and the atmospheric tempera-ture.In the conventional carburetor system, the air-fuel ratio of the mixture that is supplied to the com-bustion chamber is created by the volume of the intake air and the fuel that is metered by the jet thatis used in the respective chamber.Despite the same volume of intake air, the fuel volume requirement varies by the engine operatingconditions, such as acceleration, deceleration, or operating under a heavy load. Carburetors thatmeter the fuel through the use of jets have been provided with various auxiliary devices, so that anoptimum air-fuel ratio can be achieved to accommodate the constant changes in the operating con-ditions of the engine.As the requirements for the engine to deliver more performance and cleaner exhaust gasesincrease, it becomes necessary to control the air-fuel ratio in a more precise and finely tuned man-ner. 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 optimumair-fuel ratio required by the engine at all times by using a microprocessor that regulates the fuelinjection 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 engineresponse, better fuel economy, and reduced exhaust emissions. Furthermore, the air induction sys-tem (AI system) has been placed under computer control together with the FI system in order torealize cleaner exhaust gases.1 Ignition coil2 Air filter case3 Intake temperaturesensor4 Fuel delivery hose5 Fuel tank6 Fuel pump7 Fuel return hose8 Intake air pressuresensor9 Throttle position sensor0 Fuel injectorA O2 sensorB Catalytic converterC Crankshaft positionsensorD Coolant temperaturesensorE Spark plugF Cylinder identifica-tion sensorG Pressure regulatorH BatteryI ECUJ Atmospheric pressuresensorK Fuel injection systemrelayL Engine trouble warn-ing lightM Lean angle cut-offswitchN Air cut-off valve