Yamaha WR450F User Manual download pdf (Page 7)

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WR450F

Throttle body fuel injection

Fuel injection benefits:

1. Automatically provides optimum fuel / air ratio regardless of

altitude and temperature … with no manual re-jetting required

2. Improved throttle response and a more linear throttle control

3. Reduced fuel consumption (fuel tank capacity = changed from 7 L to 6L)

4. Adjustable design allows for tune ability to suit riding skill, riding style

and track conditions

The WR450F features a 42mm Keihin throttle body fuel injection system utilizing a

12-hole injector for superb fuel atomization at all altitudes, and over a wide range

of temperatures for outstanding throttle response. This is an open loop system.

The system utilizes a cold start knob which doubles as an idle adjuster too.

ACM output has been increased to accommodate the FI system

Cold start &

Idle adjustment knob

12 holes

NOTE: The fuel injection system can NOT be manipulated without the use of the kit ECU …

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Yamaha WR450F User Manual Page 7