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7.
Install the idle speed adjusting screw and
spring.
8.
Install the idle fuel adjusting needle and spring.
Turn the adjusting needle in (clockwise) until it
bottoms lightly.
CAUTION: The tip of the idle fuel adjusting needle is
tapered to critical dimensions. Damage to
the needle and the seat in carburetor body
will result if the needle is forced.
9.
Turn the idle fuel needle out (counterclock-
wise) from lightly bottomed according to the
instructions in the "Adjustment" section of this
Bulletin.
HIGH ALTITUDE OPERATION (FIXED JET)
When operating the engine at high altitudes the
main fuel mixture tends to get overrich. An over-
rich mixture can cause conditions such as black,
sooty exhaust smoke, misfiring, loss of speed and
power, poor fuel economy, and poor or slow gov-
ernor response.
To-compensate for this, a special high altitude
main fuel jet is available for each carburetor. The
high altitude main fuel jet is sold in a kit which in-
cludes the jet and necessary gaskets.
High Altitude Jet Installation (Fixed Jet)
1 . Remove the fuel bowl retaining screw, retain-
ing screw gasket, fuel bowl, and bowl gasket.
NOTE: If necessary, remove the air cleaner and
carburetor from engine to make fuel bowl removal
easier.
2.
Remove the float pin, float, and fuel inlet
needle.
3.
Remove the existing main fuel jet.
4.
Install the new high altitude main fuel jet and
torque to 12/16 in. lb.
5.
Reinstall the fuel inlet needle, float, and float
pin.
6.
Install the new bowl gasket from kit and the
fuel bowl. Make sure the bowl gasket and bowl
are centered and positioned properly to ensure
a good seal.
7.
Install the new bowl retaining screw gasket
from kit and the bowl retaining screw. Torque
screw to 45/55 in. lb.
8.
Reinstall the carburetor and air cleaner to en-
gine as necessary using the new gaskets from
kit.
IDLE ADJUSTMENT PROCEDURE FOR
K341 AQS ENGINES WITH ANTI-DIESELING
SOLENOID
The idle speed of some vi bra-mounted K341 AQS
engines has been increased to allow smoother op-
G
eration at low idle and an anti-dieseling solenoid
has been added to prevent dieseling during shut-
down at the higher idle speed. If called upon to
adjust the idle on any· K341 AQS engine with this
solenoid, use the following procedure. Refer to
Figure 6-31 .
STEP 1 - IDLE FUEL MIXTURE ADJUSTMENT: With
engine stopped, turn the idle fuel adjusting screw
all the way in (clockwise) until it bottoms lightly
then back out 1/2 turn.
STEP 2 - IDLE SPEED ADJUSTMENT: Start engine
and check idle speed with a hand tachometer.
Idle, no load, speed should be 2100 RPM. To set
the idle speed, loosen the jam nut on the anti-
dieseling solenoid and turn the solenoid in or out
until 21 00 RPM idle speed is attained - retighten
jam nut to lock solenoid in position.
6.19
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