AIR SCREW ADJUSTMENT
IDLE DROP PROCEDURE
Damage
to
the
air
screw
seat will
OCC(Jr
if
the
air
screw
is
tightened
against the sset.
The air screw is factory pre-sel, adjustment
is
not
necessary unless the carburetor is overhauled or air
screw is replaced.
The engine must be warm
for
accurate adjustment.
Ten minutes
of
stop-and-go riding is sufficient.
Use
a tachometer with graduations of
50
rpm
or
smaller Inat will accurately indicate
50
rpm change.
If equipped, remove the tamper-proof plug [1] to gain
access
to
air screw. See the Common
SeNies
Manual, Fuel Systems Principles/Carburetor section
for instructions.
1.
Turn the air screw
[11
clockwise until it seats lighlly,
then back it
oul
to specification given. This is
an
initial setting prior to Ihe final air screw adjustment.
INITIAL OPENING:
1 51B
turns
o
ut
TOOLS:
[2]
Pil
ot
screw
wrench
(0
type)
07KMA-MS60102 or
07KMA-MN9A100
(U.S.A.
only)
2.
Warm up the engine
10
operating temperature. Stop
and go riding for 10 minutes is sufficient.
3. Stop the engine and connect
according
to
the tachometer
instructions.
a tachometer
manufacturer's
4. Start the engine and adjust the idle speed to the
specified rpm with the throttle stop screw [3].
IDLE SPEED: 1400 ± 100
rpm
5. Turn the air screw in or out slowly
to
obtain the
highest engine speed.
6.
Readjust the idle speed with the throttle stop screw.
7.
Turn the air screw in gradually until the engine
speed drops
50
rpm.
8.
Turn the air screw counterclockwise the specified
number
of
turns.
FINAL OPENING:
1
/8
turns
out
from
step
7
9. Readjust the idle speed with the throttle stop screw.
IDLE SPEED: 1400 ± 100
rpm
10.Afler the air screw
is
adjusted. a new tamper-proof
plug must be installed.
Apply a high-strength, instant adhesive, such
as
Three Bond 7737 or equivalent. to the outside
circumference of the tamper-proof plug and install it
over the air screw.
FUEL SYSTEM
6-15
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