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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.
THR
O
TTLE OPENING (%
)
90
25
0
3000
9000 10000 11000 12000 13000
F1
F2
F3
F4 F5 F6 F7 F8 F9
ENGINE SPEED (rpm)
