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RANGE OF ADJUSTMENT OF THE VOLUME OF INJECTION F1 TO F9
F0: Transfer to the adjustment mode is shown in the display area at the bottom RHS
of the meter.
F1: This mode helps to stabilize idle running.
Too rich an A/F may foul the spark plug.
Too lean an A/F may cause unstable idle running and the engine may come to a
stop.
F2: The engine speed range of 3000 rpm or higher can be changed at a throttle
opening of 25% or less.
A change in F2 produces an effect on “feel” experienced during engine brake
activation and at the start of throttle opening.
Make a change of 2 to 5% at a time, while checking any change.
The rough A/F target is 12 to 14.
F3: Range of 25 to 90% throttle opening.
This range affects the feel, which is experienced as a result of the initial to half
throttle opening.
Jump-out at the start and hesitation at half-throttle opening may be solved by a
leaner A/F.
Make a change of 2 to 5% at a time, while checking any resulting changes.
F4: Adjusts the volume of fuel injected at any engine speed at a throttle opening of
90% or more. This mode constitutes the basic F5 to F9 data.
F5 to F9: Adjust the volume injected at individual engine speeds, at a throttle opening
of 90% or more, but note that the adjusted values in these modes are based on
the value adjusted in F4.
Example
Let F5 be “+3” after letting F4 be “+3”. The volume of fuel injected in the F5
range will be represented by “+6”.
Let F8 be “–6” after letting F4 be “+2”. The volume of fuel injected in the F8 range
will be represented by “–4”.
THE INJECTION VOLUME F5 TO F9 IS
ADJUSTED IN THE SAME WAY AS FOR F4.
THROTTLE OPENING (%)
90
25
0
3000
9000 10000 11000 12000 13000
F1
F2
F3
F4 F5 F6 F7
F8 F9
ENGINE SPEED (rpm)
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