General Information; Features; Outline - Yamaha FJR1300(S) Supplementary Service Manual

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Owner's manual (99 pages)

Table Of Contents

Table of Contents

FEATURES

OUTLINE

The 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 that

is used in the respective carburetor.

Despite the same volume of intake air, the fuel volume requirement varies by 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 con-

ditions 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 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 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. Furthermore, the air induction sys-

tem (AI system) has been placed under computer control together with the FI system in order to

realize cleaner exhaust gases.

1 Ignition coil

2 Air filter case

3 Intake air tempera-

ture sensor

4 Fuel delivery hose

5 Fuel tank

6 Fuel pump